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Review

Effects of Harmful Algal Blooms on Fish and Shellfish Species: A Case Study of New Zealand in a Changing Environment

by
Anne Rolton
1,*,
Lesley Rhodes
1,
Kate S. Hutson
1,2,
Laura Biessy
1,
Tony Bui
1,
Lincoln MacKenzie
1,
Jane E. Symonds
1 and
Kirsty F. Smith
1
1
Cawthron Institute, 98 Halifax Street East, Nelson 7010, New Zealand
2
Centre for Sustainable Tropical Fisheries and Aquaculture, College of Science and Engineering, James Cook University, Townsville 4811, Australia
*
Author to whom correspondence should be addressed.
Toxins 2022, 14(5), 341; https://doi.org/10.3390/toxins14050341
Submission received: 14 April 2022 / Revised: 11 May 2022 / Accepted: 12 May 2022 / Published: 14 May 2022
(This article belongs to the Special Issue Effects of Harmful Algal Blooms on Aquatic Organisms)
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Abstract

:
Harmful algal blooms (HABs) have wide-ranging environmental impacts, including on aquatic species of social and commercial importance. In New Zealand (NZ), strategic growth of the aquaculture industry could be adversely affected by the occurrence of HABs. This review examines HAB species which are known to bloom both globally and in NZ and their effects on commercially important shellfish and fish species. Blooms of Karenia spp. have frequently been associated with mortalities of both fish and shellfish in NZ and the sub-lethal effects of other genera, notably Alexandrium spp., on shellfish (which includes paralysis, a lack of byssus production, and reduced growth) are also of concern. Climate change and anthropogenic impacts may alter HAB population structure and dynamics, as well as the physiological responses of fish and shellfish, potentially further compromising aquatic species. Those HAB species which have been detected in NZ and have the potential to bloom and harm marine life in the future are also discussed. The use of environmental DNA (eDNA) and relevant bioassays are practical tools which enable early detection of novel, problem HAB species and rapid toxin/HAB screening, and new data from HAB monitoring of aquaculture production sites using eDNA are presented. As aquaculture grows to supply a sizable proportion of the world’s protein, the effects of HABs in reducing productivity is of increasing significance. Research into the multiple stressor effects of climate change and HABs on cultured species and using local, recent, HAB strains is needed to accurately assess effects and inform stock management strategies.
Keywords:
green-lipped mussels; oysters; finfish; salmon; aquaculture; climate change
Key Contribution: We review the current literature on the effects of several globally important Harmful Algal Bloom (HAB) species on commercially important fish and shellfish. Using NZ as a case study, we discuss the HAB species which may bloom in the future, in a changing environment and, highlight the importance of early detection, rapid HAB screening, testing local HAB strains and the need for research into the effects of HABs and other climate change related stressors to enable effective stock management.

1. Introduction

Harmful algal blooms (HABs) can cause significant impacts on human and animal health due to the production of toxic or bioactive compounds, mucilage, aggravating cellular structures like spines, or oxygen depletion of seawater [1,2,3,4]. Occurring when favourable environmental conditions exist for abundant algal growth (reviewed in [5]), HABs can have major economic and environmental repercussions [6,7,8,9]. For example, in the Gulf of Mexico, USA, annual blooms of the nonthecate dinoflagellate Karenia brevis (=“red tide” alga), have caused massive problems for recreational fisheries, tourism, the aquaculture sector, and the wider environment through the production of potent marine neurotoxins known as brevetoxins, BTXs [10]. The major impact of K. brevis blooms on the aquaculture industry has been from closure of harvest areas containing brevetoxic shellfish and toxic effects of K. brevis exposure also directly impact commercially fished bivalve species [11,12,13,14].
The direct effects of HABs on cultured fish and shellfish species can be substantial and are likely to become more significant considering increasing climate anomalies and as the farmed supply of seafood grows [15]. The early life stages of cultured species are particularly susceptible to harmful algae and their associated toxic compounds [12,16,17,18,19,20,21,22,23]. Most farmed species are confined and cannot escape blooms. This makes them extremely vulnerable to HABs, which are often sporadic and severe, and can cause losses of entire cohorts [24,25,26]. For example, in 2019, a bloom dominated by the ichthyotoxic haptophyte, Chrysochromulina leadbeateri, occurred in the Nordic fjords and was accompanied by the death of around seven and a half million farmed Atlantic salmon, Salmo salar, valued at over US$90M [27]. Chrysochromulina leadbeateri has been reported in Aotearoa/New Zealand (NZ)’s temperate coastal waters; however, it has not been associated with fish mortality to date [28].
In addition to acute lethal effects, HABs can cause a suite of behavioural and physiological effects on shellfish and fish, affecting the whole organism, or impacting at the tissue, cellular, or molecular level e.g., [13,29,30,31,32,33,34,35]. These sublethal effects (reviewed in [2,3] and discussed in Section 2) are often overlooked but can result in decreased feeding and thus slower growth rates and increased susceptibility to disease, further reducing commercial productivity.

New Zealand Aquaculture and HABs

In NZ, the aquaculture industry is worth nearly NZ$650M (=US$0.5B, [36]) and comprises three predominant species: the green-lipped mussel (Greenshell™ mussel/GSM, Perna canaliculus), king salmon (=Chinook, Oncorhynchus tschawytscha), and the Pacific oyster (Crassostrea gigas). In 2019, total annual aquaculture production in NZ was approximately 115,000 tonnes, 88% of which came from bivalve production (mainly GSM, 98,447 tonnes and Pacific oysters, 1871 tonnes) and 12% from king salmon production (nearly 15,000 tonnes; [37]). The government’s 2019 Aquaculture Strategy targets growth of the industry to NZ$3B (>US$2B) by 2030 [36]; however, a risk to this ambitious target is the occurrence of HABs and the uncertainty around the effects of HAB species and their associated toxins on cultured species.
New Zealand Marine Biotoxin Monitoring Programmes encompassing both commercial and non-commercial shellfish harvesting, have been operating since 1993, funded by industry and the NZ Government’s Ministry for Primary Industries. Samples are analysed for potentially toxic phytoplankton and/or biotoxins and these data are used to inform risk assessments on which seafood managers can base harvesting decisions. Seawater samples are routinely collected from approximately 100 specific sites throughout NZ for laboratory identification and enumeration of toxic micro-algae. A risk assessment is supplied to biotoxin regulators and farm managers within 24 h of sample receipt. Many of these sites are near shellfish and finfish farms to provide an early warning of HABs that may affect stocks. Some finfish farmers also carry out independent, routine phytoplankton monitoring on their leased sites. Despite the extensive monitoring programmes in place in NZ, there remain unknowns regarding which microalgal species or combinations of microalgae are harmful to aquatic animals and what their effects are.
Recent salmon mortality, severe declines in GSM spat settlement, and unexplained summer mortalities of GSM have been reported in NZ [38,39,40]. Although the causes of these events are not clear, HABs may be a contributing factor. Previous HAB events in NZ have impacted cultured species, e.g., [41,42,43,44] and HABs frequently occur in important growing areas for Pacific oyster, GSM, and king salmon (i.e., Southland, Stewart Island, Marlborough Sounds, Bay of Islands, Auckland, and Coromandel, Figure 1). Such events appear to be increasing in geographic range, duration, and frequency. In the Marlborough Sounds, novel HABs of the thecate dinoflagellate Alexandrium pacificum first appeared in Queen Charlotte Sound in 2011 [45], around the same time as a reduction in GSM spat-fall in traditional spat catching areas was first observed [38,40]. Blooms have since been detected in the neighbouring Pelorus Sound, Tasman Bay, and Golden Bay and are moving towards the West Coast of the South Island [25,45,46], Figure 1.
Common HAB species present in NZ and their geographic distributions have recently been reviewed in [25] and a comprehensive review on the risk of paralytic shellfish poisoning (PSP) toxins on shellfish aquaculture in NZ was carried out by [45]. To complement these works, the aim of this study was to identify the effects of HAB species which have bloomed in NZ and impacted on commercially important fish and shellfish species of relevance to the aquaculture industry. We also consider HAB issues that may be encountered in a changing environment. New Zealand locations mentioned in the text are shown in Figure 1.

2. Effects of Bloom Forming HAB Species on Species of Relevance to the NZ Aquaculture Industry

Several HAB-forming species present in NZ have been implicated in lethal or sublethal effects on commercially important fish and shellfish species (Figure 2, Table 1). Here, we consider these and other key genera including Alexandrium, Gymnodinium, Karenia, Dinophysis, Pseudo-nitzschia, and Heterosigma, Fibrocapsa, which have bloomed in NZ waters, and their impact on species of relevance to the aquaculture industry in NZ.

2.1. Alexandrium and Gymnodinium spp.

Blooms of Alexandrium pacificum, A. minutum, and Gymnodiniun catenatum, all thecate dinoflagellates, have been recorded in NZ coastal waters [25,45]. Cells of these species can produce paralytic shellfish toxins (PSTs), including saxitoxin and its many analogues, and other bioactive extracellular compounds (BECs) which can cause ichthyotoxic and negative effects on shellfish [16,66,67,132,133]. The presence of these other BECs, in addition to PSTs, can make it difficult to determine the causative compound of any cytotoxic effects.
Negative behavioural and physiological effects following exposure of adult shellfish species to A. pacificum have been reported by several authors [34,60,61,62,63,134], as have lethal and sublethal effects on the early life stages of scallops, Argopecten irradians, where toxicity was attributed primarily to the presence of unknown bioactive toxins rather than PSTs [64,65]. Within NZ, investigations into the effects of A. pacificum on cultured shellfish species have largely focussed on later life stages (Figure 2). Behavioural and physiological effects include erratic siphon activity of surf clams, Paphies donacina, and alterations in the clearance rate of bivalves, including scallops, Pecten novaezelandiae, and flat oysters, Ostrea chilensis, exposed to bloom concentrations of A. pacificum see [55,56,58,59]. Juvenile oysters, O. chilensis (~20 mm), were also paralysed, but still alive, during the first A. pacificum bloom that occurred in Queen Charlotte Sound in 2011 and lasted for 2 months [135]. Most of these animals eventually died, as the mantle over-grew the shell margins, and they could not close their valves after the bloom subsided. A reduction in adult byssus production [55], and spat (~2.5 mm) byssal pad formation and growth [57], have been reported in GSM exposed to A. pacificum, which has implications for the survival, attachment, and retention of wild and farmed spat. It remains unclear if negative effects are caused by ingestion of toxic cells (intracellular toxins), contact with extracellular toxins (PSTs or other), or cell surface contact.
During A. pacificum blooms in NZ, cells have been observed within salmon farms, but cell numbers have generally been low and no adverse effects on the health of the fish have been reported [45]. The neurotoxicity of PSTs, however, is well documented in fish [2]. They cause the impairment of sensor-motor function, such as loss of orientation, paralysis, and abnormal swimming behaviour, that affects both adult and larval fish survival [19] (and references there in).
Blooms of Alexandrium minutum have been investigated since 1993 in NZ, when the first incident of PSP contamination in shellfish was identified [136,137,138]. Since then, this dinoflagellate has been implicated in several incidents in NZ, which have required the closure of commercial shellfish harvesting in the Marlborough Sounds and human illness from recreational harvest in the Bay of Plenty [25,45,139]. Alexandrium minutum has not been associated with fish mortalities and investigations into the effects of A. minutum on shellfish in NZ are lacking.
There has been extensive study of the effects of Alexandrium minutum on Pacific oysters, C. gigas. Inflammatory responses are typically seen in the digestive gland and hemolymph of adult C. gigas exposed to bloom concentrations of A. minutum [68,69], and behavioural modifications can include reduced clearance and filtration rate, valve activity and increased shell micro-closures, genotoxic effects, and an increase in antioxidant and detoxification gene expression in the gills [70,71,72,73]. Crassostrea gigas exposed to toxic A. minutum during gamete ripening, showed negative impacts on sperm motility, larval size, and settlement of larvae produced from exposed parents [67,68]. Recent studies have provided a better understanding of the toxicity of A. minutum to bivalves [66,75], with BECs found to be responsible for the negative effects on the gills of adult C. gigas, whereas PSTs impact the digestive gland [66]. Direct exposure of the early life stages of C. gigas also negatively affected gamete quality, fertilization success, and subsequent larval development [16,17,67,74], with negative effects attributed primarily to BECs rather than PSTs.
In the Port River in South Australia, an A. minutum bloom in the late 1980s showed an ichthyotoxic potential for this dinoflagellate species [140]. It was evident that the ichthyotoxicity was not caused by PSTs and that the toxin(s) were most likely effective exocellularly. This has been suggested to be a defence or allelopathic mechanism [25]. While saxitoxin-like and brevetoxin-like activity was indicated by a neuroblastoma tissue culture assay, no BTXs were detected, and the toxic principle remains unknown [140].
One of the most harmful blooms to be documented in NZ was that of PST producing Gymnodinium catenatum [45]. Blooms started in the North Island in May 2000 and lasted until 2003, during which time they caused wide-spread contamination and closure of shellfish harvest areas [141]. There have been further blooms since that time [45].
Exposure of trochophore C. gigas to 107 cells L−1 of G. catenatum for 10 h had no effect on larval survival [85], however; Pacific oyster spat (3 mm) exposed to a lower concentration of G. catenatum (3 × 105 cells L−1) for 24 h, showed behavioural and physiological changes, such as reduced clearance rates, increased valve shell closures, and increased pseudofaeces production [83]. Following a longer, 14 d exposure of C. gigas spat, exfoliation and epithelial rupture and inflammation were recorded in the digestive gland and gill, as were increased expression of genes involved in antioxidant defence, cell detoxification, intermediate immune response activation, and stress responses [83,84]. Additional physiological responses, including paralysis and apoptosis of hemocytes, have also been recorded in scallops, Argopecten ventricosus, and Nodipecten subnodosus [86,87,88]. The effects of NZ G. catenatum strains on aquaculture species are yet to be determined.
Blooms of Gymnodinium catenatum have rarely been associated with wild fish kills worldwide (see [81,82]) and never in NZ. Although blooms of this species have been extensive in the North Island of NZ, they occur relatively infrequently and to date have not affected the main finfish aquaculture areas in the south [45].

2.2. Karenia spp.

Several species in the non-thecate dinoflagellate genus Karenia have been identified in NZ waters, including Karenia papilionacea, K. selliformis, K. bidigitata (=K. bicuneiformis), K. mikimotoi, K. umbella, and K. brevisulcata, of which some produce toxins such as BTX, BTX-like compounds, gymnodimine, and haemolytic glycolipids [142]. To date, K. mikimotoi, K. selliformis, K. brevisulcata and, more recently, K. umbella have formed and dominated blooms, with the former three species also implicated in large scale finfish and shellfish mortalities [90,96,97,98,110,142,143], Figure 2.
Karenia mikimotoi is one of the most common HAB species in NZ waters and is regularly associated with losses of farmed fish, and commercial and wild shellfish worldwide (reviewed by [23,93,94]). Japanese pearl oysters, Pinctada fucata martensii, for example, have been severely affected by recurrent blooms (e.g., [144,145]). Unsurprisingly, the early life stages of this and other commercially important shellfish species have been shown to be susceptible, with toxicity speculated to be from unknown bioactive compounds [85,99,105,106,107,108,109]. Cells of K. mikimotoi have been shown to produce haemolysin, which elicits toxic effects upon direct contact with the cells, and the reduced clearance rates of these cells by commercially important species such as adult C. gigas and M. galloprovincialis may be for this reason [61,100,101,102]. Exposure to this dinoflagellate also affects the immune functions of shellfish [33,103,104].
A K. mikimotoi dominated bloom that occurred in 1992 to 1993 in the Hauraki Gulf was a turning point for the NZ seafood industry and resulted in the development of the monitoring programmes that exist today [146]. At the onset of the bloom, El Niño climate conditions were occurring, with resultant cold sea temperatures off the north-east coast. Initially, GSM developed blood red guts, which was unappealing to consumers. This was due to a bloom of the ciliate Mesodinium rubrum (=Myrionecta rubra) which co-occurred with a Noctiluca scintillans (dinoflagellate) bloom. Shellfish were, however, unaffected at that time [143]. A Karenia bloom followed, developing during December 1992 [143,147] and BTXs were detected in shellfish from the area, although the Karenia species responsible for the toxins at that time has never been definitively determined [146]. It is interesting to note that using invertebrate larvae assays [91], K. mikimotoi was shown to impact pāua (abalone; Haliotis iris) larvae (LT50 10 h at 12 × 106 cells per litre), as pāua were reported to fall from the rocks (and mass mortalities of other marine organisms were recorded) during the early 1993 phase of the bloom. Low concentrations of brevetoxin-like lipid soluble toxins were reported in these affected shellfish [138].
A large bloom of K. mikimotoi in South Australia in 2014 caused massive mortality of abalone, rock lobster, turbo shells, various finfish, and echinoderms [95], and crude extracts of K. mikimotoi exhibited high lytic activity towards fish erythrocytes [92]. In NZ, K. mikimotoi has been implicated in fish mortalities [96,98]. In Northland, 2007, wild fish and eel mortalities were recorded, and an associated red discolouration of the seawater noted. Karenia mikimotoi was determined as the cause based on molecular assay results (fluorescent in situ hybridisation assays, quantitative PCR, and sandwich hybridisation assays). No BTXs were detected by liquid chromatography/mass spectroscopy and while haemolytic glycolipids could not be ruled out, anoxia was considered the prime cause of the mortalities [98].
Blooms of the fish-killing K. selliformis cause significant ecological damage including water column anoxia and marine fauna toxicity worldwide, including in NZ, Mexico, Tunisia, Kuwait, Iran, China, and Chile [112]. In mid-September 2021 over a period of two months, an unprecedented mixed bloom of Karenia species, including K. selliformis, K. mikimotoi, K. longicanalis, Karlodinium sp., and Takayama spp., occurred along the south-eastern coast of Hokkaido, Japan [148], with mass die-offs of sea urchins (Strongylocentrotus intermedius and Mesocentrotus nudus), salmon (Oncorhynchus keta) in fixed nets, octopus (Paroctopus conispadiceus), whelks (Neptunea spp.), chitons (Cryptochiton stelleri), bivalves (e.g., Pseudocardium sachalinense), and juvenile fish in rearing facilities [113,148]. Following laboratory exposures, adult Manila clams, Ruditapes philippinarum, have also been shown to be sensitive to exposure to K. selliformis, with cellular changes in the hemolymph recorded up to 6 weeks following exposure to bloom concentrations [103,115].
Extensive blooms of the then undescribed species, K. selliformis, occurred in Southland, NZ, during two successive summers 1993/94 and 1995/96 [142]. The toxin detected in extracts of exposed Bluff oysters, Ostrea chilensis, proved to be Gymnodimine and appeared to be a neuromuscular blocking agent, production of which was enhanced by addition of organic acids to the K. selliformis growth medium [149,150]. A south-north progression of the bloom, which also contained cells of K. bicuneiformis (as K. digitata) and K. papilionacea, was associated with the mortality of a variety fish and shellfish along the southeast coast [110,111]. Widespread deaths of pāua (H. iris) and a mass stranding, estimated at about one million tuatua (surf clams, Paphies subtriangulata) was reported. There was evidence that the bloom penetrated as far north as Port Underwood in Marlborough where it was associated with farmed juvenile GSM mortalities [110]. There was some experimental evidence that K. selliformis had a fast-acting toxic effect on oyster larvae [114].
The highly toxic K. brevisulcata (see [89]), which produces an array of toxins, including ten lipid soluble K. brevisulcata toxins and six water soluble brevisulcatic acids, killed all marine life in Wellington Harbour, NZ, in 1998 [90]. Tuna (Thunnus alalunga), striped marlin (Kajikia audax), and broad bill swordfish (Xiphias gladius), as well as kina/sea urchins (Evichinus chloroticus), starfish species, and pāua, were found washed up on the coastline and aerosols of the bloom caused respiratory distress and eye and skin irritation in humans in the vicinity [90]. Brevisulcatic acids extracted from K. brevisulcata, have been shown to be toxic to juvenile king salmon and snapper, Chrysophrys auratus (as Pagrus auratus) in experimental trials [91]. This toxicity extended to GSM, sea urchin and pāua larvae, and, to a lesser degree, sea slugs, Pleurobranchaea maculata and oyster (C. gigas) larvae [91].
Karenia umbella was first associated with mortalities of cage-reared rainbow trout and Atlantic salmon in Tasmania in the late 1980s and early 2000s [116]. Karenia umbella is common in NZ’s coastal waters and blooms have been observed previously in sheltered embayments in the Marlborough Sounds. In early March 2018 and mid-February 2020, blooms of K. umbella were detected in Akaroa Harbour, south of Christchurch. The 2020 bloom dispersed throughout the harbour, including in and around several salmon farms in the area, causing distress to fish, although mortalities were low [135]. Samples collected from the salmon farm pens on 21st to 23rd February 2020 contained cell numbers up to 5 × 104 cells L−1 [114]; however, toxin production by this species has not been confirmed.

2.3. Dinophysis spp.

Blooms of the thecate dinoflagellates Dinophysis acuminata and D. acuta have been documented throughout NZ, with the former occurring every year in an important GSM culture area, Port Underwood, in the Marlborough Sounds [151,152]. The cellular toxin content of bloom forming D. acuminata in NZ is low and the toxin profile is dominated by pectenotoxin-2 and dinophysistoxin-1 [152]. In Brazil, natural blooms of the same species have been shown to have negative effects on the immune system of adult C. gigas, the brown mussel, Perna perna, and the clam, Anomalocardia brasiliana (see [78,79]). Recent work by [80] in which gametes of C. gigas were exposed to D. acuminata for two hours, resulted in a reduction in fertilization success, which was attributed mainly to the presence of pectonotoxin-2. A similar species, D. caudata, which also produces pectenotoxins, has been shown to induce mucus and pseudofaeces production, paralysis, and negative effects on the digestive gland of adult scallops, Patinopecten yessoensis, and Mimachlamys nobilis (see [153]).
Although there have been no recorded fish mortality events associated with Dinophysis blooms, experimental exposure of fish to okadaic acid, dinophysistoxins, and Dinophysis cells produce a range of negative effects at different life stages, either by waterborne or dietary routes. These effects range from impacts on fish fitness, swimming performance, feeding, foraging, and escape from predators to reduced fish abundance [18]. There is a lack of information on lethal impacts, and sublethal and chronic effects of toxic Dinophysis in the environment [154].

2.4. Pseudo-nitzschia spp.

The amnesic shellfish poisoning diatom genus Pseudo-nitzschia is a regular bloom former throughout NZ coastal waters, particularly during the Austral spring and summer [155]. It is responsible for occasional domoic acid (DA) contamination of shellfish, in particular scallops, Pecten novaezealandiae, and, rarely, GSM. Many bloom-forming Pseudo-nitzschia spp. have been reported in NZ waters with highly variable DA production [155,156]. Dominant bloom formers have been identified as P. fraudulenta and P. pseudodelicatissima, with P. australis and P. pungens common in spring, and P. multiseries, P. multistriata, P. heimii, and P. delicatissima, also detected in bloom concentrations at different times [25,155].
Effects on the feeding behaviour of bivalves have been observed in juvenile Pacific oysters, C. gigas, and scallops, P. maximus, exposed to French strains of P. australis and P. fraudulenta. Both bivalve species preferentially filtered non-toxic algae compared to the Pseudo-nitzschia cells and the clearance rate of C. gigas was reduced when exposed to toxic P. australis (see [47]). Interestingly, the presence of bivalves was found to induce an increase in the cellular DA contents of both Pseudo-nitzschia species [47]. Similarly, both juvenile and adult eastern oysters, C. virginica, and mussels, Mytilis edulis, were shown to reduce their clearance rate and increase pseudofaeces production when exposed to toxic P. multiseries [48,49,50,51]. The oysters did not differentiate between toxic P. multiseries and non-DA producing P. delicatissima, however, they exhibited comparable filtration of both algal species [50]. Physiological changes have also been observed in adult C. gigas exposed to DA-producing P. multiseries, with a spike in the hemocyte count and phagocytic activity of hemocytes recorded following only 4 h exposure [53]. The early life stages of Pecten maximus were found to be sensitive to exposure to dissolved DA with the growth, development to eye-spot stage and survival of larvae negatively affected [46]. However, the authors of [52] showed P. multiseries and DA exposure had no effect on the survival and development of M. edulis larvae.
In NZ, a novel, toxic, DA isomer, referred to as iso-DA-C, was detected in GSM, scallops and Pacific oysters harvested from the Marlborough Sounds and the Bay of Plenty in August 2001 [157]. The causative organism was determined as P. australis, but no effects were reported in the bivalves [158].
It is well documented that planktivorous fish can accumulate high levels of DA during toxic Pseudo-nitzschia blooms (e.g., [159]) and that DA can then be transferred up the food chain to seabirds and marine mammals when toxic fish are consumed [160]. While there are documented cases of resultant mass mortality events, there has been no environmental evidence for the fish being directly affected by toxic Pseudo-nitzschia blooms [161]. Direct injection of DA can cause excitotoxicity behaviours in fish, but ecologically relevant routes of exposure do not appear to cause harm to fish as they do to humans, marine mammals, and birds. Some effect may be induced by mechanical damage to gills including mucosa irritation (i.e., mucus overproduction), which can affect gill function or increase susceptibility to secondary bacterial, viral and parasitic infections [54].

2.5. The Raphidophytes: Heterosigma and Fibrocapsa

The first major loss of farmed fish in NZ occurred in January 1989 in Big Glory Bay, Rakiura/Stewart Island. More than eight hundred tonnes of Chinook salmon, valued at >NZ$17M at the time, died from impaired functioning of gills due to exposure to a bloom of the raphidophyte Heterosigma akashiwo (see [41,120], Figure 2). At the time, warmer than usual weather and a stable water column due to a La Niña phase of the Southern Oscillation provided ideal conditions for H. akashiwo to bloom, particularly as cells could migrate to deeper, more nutrient rich waters at night [41,120]. This species has been associated with fish kills globally [94,121,122,123] and since the first identification of H. akashiwo in NZ in 1989, it has been found to be common in NZ’s coastal waters and significant blooms have occasionally developed (for example, in Pelorus Sound, in the summer of 2017/18).
Both early and adult life stages of bivalves have been shown to be sensitive to bloom concentrations of H. akashiwo. The presence of algal cells reduced the swimming velocity of spermatozoa, as well as larval survival, activity, and metamorphosis of the Japanese Pearl oyster, Pinctada fucata martensii, and of the scallop, Argopecten irradians, with the toxic mechanism thought to be from the shed algal glycocalyx structures and mucus [124,125,126]. Adult Eastern oysters, C. virginica, exposed to bloom concentrations of H. akashiwo, closed their shells and reduced filtration [32,127] and in vitro exposure of C. virginica and hard clam (M. mercenaria) hemocytes to cultures of H. akashiwo resulted in increased haemocyte mortality [33].
In NZ, microalgal blooms are often associated with El Niño climate conditions and Fibrocapsa japonica was a major component of HABs during the early stages of the major Karenia bloom of 1993 [143,162]. The cells of F. japonica produce trichocysts and the ejection of these should be considered as a potential threat to shellfish larvae recruitment through entanglement [162]. Adult eastern oysters, C. virginica, exposed to water collected from a bloom of F. japonica, showed significantly increased lysosomal destabilization rates in the digestive gland [128] and other bivalve species may also be sensitive to exposure. Blooms of F. japonica have been implicated in the reduction of fish stocks overseas, but the mechanisms involved are still unclear. It has been demonstrated, however, that mortalities of the larvae of the common flat fish sole, Solea solea, occur in the presence of F. japonica cells, particularly when exposed to late exponential phase cultures, and that warmer temperatures had a distinct effect on the mortalities [129]. The involvement of endo- and exotoxins has been postulated with haemolytic polyunsaturated fatty acids as the main endotoxins, and other haemolysins and reactive oxygen species as the main exotoxins. Blooms of F. japonica have not been associated with fish mortalities in NZ, and studies of NZ strains did not detect ichthyotoxins [163].

2.6. Other Bloom Forming HAB Species in New Zealand

In 2010, approximately two hundred tonnes of farmed Chinook salmon died in Queen Charlotte Sound, Marlborough Sounds. The cause proved to be the dictyophyte Pseudochattonella verruculosa (Figure 2 and Figure 3) and the mortalities occurred at cell concentrations ten-fold less than those caused by the earlier H. akashiwo bloom in Big Glory Bay. The pathologies of the dead fish were inconclusive, although hypoxia was considered a primary cause. Moving net pens to a bloom-free site saw the recovery of the surviving fish. The bloom occurred after a long period of heavy rainfall and when seawater temperatures were at their annual minimum (12 °C), as was daylength, at nine hours [43].
Highly potent palytoxin-like compounds may be produced by the thecate dinoflagellate genus Ostreopsis. In NZ, Ostreopsis cf. siamensis (=Ostreopsis sp.) reported by [164] produces such compounds [165,166] and kina (sea urchin, Evechinus chloroticus), are particularly vulnerable to the toxins. During recurrent blooms of O. cf. siamensis in Northland waters, mass mortalities occurred [117], Figure 2. Declines in adult kina density in the order of 56–60% were reported following a period of calm sea conditions with warmer than average water temperatures [118]. Larvae were, however, unaffected by O. cf. siamensis in in vitro assays, suggesting that the survival and recruitment of larvae in the wild may continue despite blooms [166].
On occasion, reports of blood red oysters are received [167] and this can usually be traced back to blooms of the deeply red coloured ciliate Mesodinium rubrum in the vicinity. The oysters are generally considered unfit to eat but are not toxic and appear unaffected by the ciliate.
In 1983, in Northland’s Bream Bay, NZ, fish and shellfish mortalities were associated with a mixed bloom of the diatom Cerataulina pelagica (Figure 2) and an undescribed haptophyte, a Prymnesium species. This genus had been associated with fish mortalities previously. The new species was described and classified as P. calathiferum (see [119], Figure 2) and proved closely related to the biotoxin producer P. parvum. The latter produces prymnesins and has caused mortalities of fish and invertebrates world-wide (see [168,169]).
Even when HABs are non-toxic, they may cause shellfish or finfish mortalities due to a lack of oxygen, particularly when they occur in confined bays and harbours. For example, the usually harmless green flagellate, Tetraselmis sp., caused the death of pilchards, Sardinops sagax in a Wellington Harbour lagoon in 1993 due to an oxygen deficit [170]. The diatom Cerataulina pelagica similarly caused finfish and shellfish deaths, in Bream Bay in 1982 [76]. Blooms have been reported to cause clogging of gills through production of mucus for more than a century. Gonyaulax fragilis produces transparent exo-polymers composed primarily of galactose and glucose monomers. This ‘slime’ can cause mass mortalities of marine fauna and impede fishing activities and has been responsible for fish deaths in Tasman Bay, NZ [25,77], Figure 2. Ubiquitous spiny diatoms such as Chaetoceros spp. can cause mechanical damage due to the barbed setae becoming embedded in the lamellar epithelium of salmonid gills with resultant production of excessive amounts of mucus. Death can result from asphyxia or increased susceptibility to secondary infections [171,172].

3. Future Issues

The following section (and Table 2) details HAB species that, although they have not yet bloomed, occur in NZ waters, and, therefore, have a potential to harm marine life. This section includes monitoring data from aquaculture production areas around NZ (Section 3.1.1). Section 3.2 discusses HAB species that are likely to be encountered in NZ in the future.

3.1. Ichthyotoxic HAB Species Present in New Zealand

The spirolide producing dinoflagellate, Alexandrium ostenfeldii, has been shown to negatively affect commercially important bivalve species [173,174]. Cysts of A. ostenfeldii are common in coastal sediments around NZ but are rarely found in the plankton [45]. These resting cyst beds may indicate past blooms [110] or that A. ostenfeldii is mainly a benthic species in NZ.
The karlotoxin producing nonthecate dinoflagellate Karlodinium veneficum (previously K. micrum) has been recorded in both the northeastern Hauraki Gulf and the more southern Marlborough Sounds [202]. This species has been shown to have harmful effects on shellfish, including mussels, M. edulis; clams, Mercenaria mercenaria; and oysters, Crassostrea virginica and C. ariakensis (see [185,186,187,188]). This ichthyotoxic species was implicated in massive finfish mortalities (more than 100,000 fish) in the sub-tropical Upper Swan River Estuary in Western Australia [182]. Numerous fish species were affected, including black bream, Acanthopagrus butcheri; Perth herring, Elops machnata; and Swan River gobies, Pseudogobius olorum. Gill histopathology was comparable to the damage shown in laboratory experiments, and it was also demonstrated that microalgal cell lysis was required for the toxic effects. In the USA, Karlodinium veneficum (as K. micrum) has been implicated in three separate fish kills of hybrid striped bass (M. chrysops × M. saxatilis) in Chesapeake Bay, Maryland [183,184] and toxic substances were detected in cell-based assays. The toxins, karlotoxins, have been characterised and it is possible that they are involved in predation by the mixotrophic dinoflagellates [203]. Hong Kong, and the wider coastal waters of south China, were impacted by a massive bloom of the related K. digitatum (previously K. digitata) in 1998, with concurrent fish kills. The bloom was indiscriminate, killing at least twenty-two fish species, both farmed (caged) and naturally occurring. Low wind speeds, warming harbour waters, and high nitrogen and phosphate levels appeared to trigger the bloom [204]. The genus Karlodinium should, therefore, be of concern for finfish aquaculture and requires further research in NZ as well as regular monitoring. It is plausible that the genus is quite diverse with a single transect of the Southern Ocean south of Tasmania, Australia, giving rise to five new Karlodinium species [205].
In Japan, ‘red tides’ of the thecate dinoflagellate Heterocapsa circularisquama devastated the bivalve shellfish industry in 1998, impacting on the mariculture of the Japanese pearl oyster, Pinctada fucata martensii [178]. Only invertebrates were affected at that time, and the cause appeared to be a labile protein-like complex on the cell surface which was causing the detrimental effect on bivalves. Further studies revealed mortalities in several commercially important bivalve species exposed to this microalga [29,85,179,180]. Five Heterocapsa species have been recorded in NZ, including H. cf. circularisquama, which occurs in northern sub-tropical waters. To date, no bivalve mortalities have been reported, although H. illdefina has been responsible for ‘swimmers itch’ and may therefore have some toxic properties [181].
The thecate dinoflagellate Prorocentrum rhathymum (syn. P. mexicanum under investigation) has been recorded in NZ [206], but has not been associated with marine mortalities. It has, however, been linked to oyster spat, C. gigas mortalities in Tasmania, Australia. Intraperitoneal mouse bioassays revealed fast acting toxins in methanol but not aqueous extracts of P. rhathymum, with mice dying in less than 20 min [197].
Prevalent along southeast Asian and north American coasts, the thecate dinoflagellate Cochlodinium polykrikoides (syn. Margalefidinium polykrikoides) has been responsible for massive fish kills in those regions (e.g., [94,175,176,177]). The dinoflagellate species poses a potential risk to finfish in NZ as it has been reported in NZ waters and would most likely bloom in offshore northern waters where temperature ‘hot spots’ have occurred [207,208].
The globally distributed, heterotrophic, dinoflagellate genera Pfiesteria and Pseudopfiesteria are both considered responsible for fish kills in eutrophic estuaries in the USA [191], although considerable strain variability in toxicity has been noted [209]. These dinoflagellates possess a peduncle (feeding tube) that can be extended between its sulcal plates and used to feed on micro-algae, bacteria, fish, and other organisms. This feeding behaviour is known as myzocytosis and can cause tissue damage and contribute to the death of fish [191,192] and bivalve larvae [193,194].
Both Pfiesteria and Pseudopfiesteria have been reported in NZ, particularly in estuarine habitats, and the potential risk to animal health is dependent on the continued control of nutrient inputs into NZ’s estuaries and brackish lakes. The thecate Pfiesteria piscicida and Ps. shumwayae are resident in the sediments of Tasman Bay’s well-flushed estuaries and Canterbury’s brackish lakes, as determined by quantitative PCR assays targeted at ribosomal DNA [195,210,211] and confirmed by scanning electron microscopy of motile cells [195]. Most detections have been of cysts in sediments, but motile cells have been detected in water samples in late summer–autumn [195]. Similarly, Ps. shumwayae causes mortality of larval and adult bivalve species [196] and a strain of Ps. shumwayae, isolated from Tasman Bay sediments, has been shown to be ichthyotoxic [195].
The raphidophyte genus Chattonella has caused massive fish kills in Australia. Mass mortalities of caged bluefin tuna, Thunnus maccoyii, in South Australia in 1996 were caused by C. marina blooms with a cost to the industry of an estimated AU$45 million [200,201]. The higher potency of the Australian blooms (which killed at 66,000 cells L−1 compared to Japan at 500,000 cells L−1 where similar mass fish mortalities have occurred; see [199]) was attributed to the higher sensitivities of tuna and to the higher ichthyotoxicity of Australian high-light adapted algal strains [212]. The toxic potential of Chattonella is believed to be associated with a high production of reactive oxygen species [213]. Early life stages of the Japanese Pearl oyster, Pinctada fucata martensii have been shown to be sensitive to C. marina with negative effects observed on sperm swimming velocity [124] and on the umbo and pre-settling larval stages [125]. In NZ, C. marina var. antiqua has been isolated from the northeast and the southernmost coast of the North Island. Cultures were tested and were negative for BTXs [214].
Another potentially problematic microalga is the newly described haptophyte species Pavlomulina ranunculiformis (Figure 4), which has been observed attaching to oyster larvae and then swelling (apparently becoming engorged) before dropping away [28]. Whether this proves to be an issue for aquaculture remains to be seen.

3.1.1. Potentially Harmful Taxa Detected Using High-Throughput Sequencing Metabarcoding

Seawater samples from around the South Island of New Zealand, collected as part of the New Zealand Marine Biotoxin Monitoring Programmes and containing cells of potentially ichthyotoxic species were analysed using high-throughput sequencing metabarcoding. Four primer sets (Supplementary Table S1) targeting the 18S and 28S ribosomal RNA regions were used to attempt to capture a wide range of potentially toxic taxa. Specific primers for dinoflagellates and haptophytes were used to maximise coverage of these important groups. Morphological classification of these groups is also problematic, and we aimed to increase molecular data and knowledge of these harmful taxa. No raphidophyte or dictyochophyte taxa were detected using any of the primer pairs and so our analyses focused on diatoms, dinoflagellates, and haptophytes.
All sites were dominated by the diatoms Chaetoceros spp. (Figure 5), and the harmful species C. convolutes was detected (Supplementary Table S2). This species has large barbs which can cause finfish mortalities even at very low concentrations due to microbial infections of damaged gill tissue, haemorrhage of gill capillaries or suffocation from excess mucus production at the sites of penetration of the gills by the spines [171]. Pseudo-nitzschia pseudodelicatissima was also found at Waitata Reach (Figure 5). It is a common bloom forming species in New Zealand which can also cause physical damage to fish gills.
The diversity of dinoflagellates at all sites was high for both gene regions used, and several harmful taxa were detected, including Alexandrium spp., Gonyaulax fragilis, Dinophysis spp., Karenia spp., Karlodinium spp., Pfiesteria sp., and Prorocentrum spp. (Figure 6). Most of these genera were present at low levels; however, Alexandrium pacifium was a dominant species at most of the Marlborough Sounds sites. A bloom of Karenia umbella was detected in Akaroa (Figure 6B), a species that has caused issues in this harbour previously. Karlodinium and Takayama species were also both detected and while no associated fish kills or toxin events have occurred in New Zealand to date, both genera have been implicated in fish kills in Australia [111].
Some genera, such as Dinophysis and most Prorocentrum spp., were unable to be classified to species-level using the two gene regions used, although good resolution was achieved for other genera including Alexandrium, Karenia, and Karlodinium, highlighting the usefulness of these gene regions for nucleic acid-based detection methods [215].
The harmful genus Chrysochromulina was common at all sampled sites (Figure 7), although the most common species associated with fish mortalities worldwide, C. polylepis and C. leadbeateri, were not detected (Supplementary Table S2). Both gene regions showed good taxonomic resolution for this genus. The 18S ribosomal gene did detect a higher number of haptophyte species, likely due to a more comprehensive database available for this region. Other harmful genera detected were Phaeocystis and Prymnesium, although these could not be resolved to the species level (Figure 7; Supplementary Table S2).
These data show that many potentially harmful taxa are common at important aquaculture sites in New Zealand, especially in the important aquaculture region, the Marlborough Sounds. An increase in the DNA sequence data available for these taxa will enable the development of more specific and rapid molecular tools for the detection and characterisation of HABs. This is especially important for species that are difficult to identify by light microscopy (e.g., Chrysochromulina; [216]).

3.2. HABs in a Changing Environment

Sea surface and sub-surface waters around New Zealand are warming [207]. From 2002 to 2020, there was an estimated 0.2–0.4 °C decade−1 increase in sea surface temperature in the important GSM-producing Pelorus Sound, Marlborough Sounds, which has likely contributed to difficulties in gaining year-round wild-spat supply and a decrease in mussel condition, leading to a reduction in the value of harvest [217]. In addition to this ocean warming, the 2017 marine heatwave, that persisted for the entire Austral summer, during which sea surface temperature abnormalities reached up to +3.7 °C in the Eastern Tasman Sea [208], contributed to the deaths of many salmon in the Marlborough Sounds [39].
Increased temperatures and temperature anomalies affect the metabolic and physiological responses of commercially important fish and shellfish species, rendering them more susceptible to the effects of abiotic and biotic stressors such as HABs (Figure 8, [218,219,220]). Previous studies have demonstrated the interactive effects of harmful algae and other biotic stressors (i.e., infectious agents), on the immune response of bivalves [221,222]. Research on the multiple stressor effects of temperature changes (and related climate change stressors) and HABs is lacking. This knowledge is essential to obtain a more ecologically accurate assessment of the effects of HABs on commercially important species [223].
Increased water temperatures, temperature anomalies, and temperature-driven stratification will also change the abundance, composition, biogeography, and seasonal distribution of the phytoplankton (Figure 8, [5,224]). Such changes may result in exceptional HABs, such as the unprecedented large-scale HABs reported in the coastal waters off the south-eastern coast of Hokkaido, Japan, from mid-September 2021, about one month after intense and extensive marine heatwaves subsided [113].
The toxicity of HABs is already known to vary significantly among isolates of the same algal species [225] and even within strains from the same population [226]. Climate-change driven changes in the phytoplankton may also change HAB toxicity, further highlighting the need to investigate the effects of local, recent, HAB strains of interest on commercially important species. The use of relevant bioassays, using bivalve gametes [22,74], larvae [12,22] hemocytes [33], and fish gill cells [227], for example, will allow rapid screening of potentially toxic HAB species and determination of what is causing the toxic effects (i.e., known toxins or other, often uncharacterised, bioactive compounds), enabling refinement of risk assessments and accurate mitigation strategies for producers.
Changes in the phytoplankton may also lead to the proliferation of HABs novel to NZ. The ciguatera fish poisoning dinoflagellate genus, Gambierdiscus, has been reported in New Zealand coastal waters and is likely to proliferate with warming waters [228]. The dinoflagellate, Alexandrium catenella (=A. fundyense, Group I, [131]) has contaminated shellfish in Australia, particularly since 2012 [25,229], and has been responsible for mass shellfish and fish kills world-wide (e.g., [230,231,232]). It is likely A. catenella is present in offshore waters of NZ, given the proximity to Tasmania, Australia. As is hypothesised in Australia, persistent ocean stratification driven by climate change, may well lead to the emergence of blooms of this species in NZ [25], as has been seen with A. pacificum with its spread to the top of the South Island [233]. The use of molecular methods for species detection and comprehensive monitoring programmes will ensure that such changes are identified promptly.

4. Conclusions and Future Directions

Harmful algal blooms (HABs) have wide-ranging effects on aquatic species of commercial importance. In addition to the lethal effects of HAB exposure, sublethal effects can also reduce commercial productivity by reducing the fitness of the animal [154]. The use of molecular methods and comprehensive HAB monitoring programmes allow for early detection of novel and problem species [234] and use of cost-effective, high through-put bioassays can be used to rapidly identify any local, novel HAB species of concern. Moreover, improvements in predicting the movement and size of HABs, such as the use of statistical and machine learning HAB forecasting tools (see [6,235]), are enabling more proactive management responses. Mitigating the impacts of HABs on industry, however, is challenging. Stock management strategies could include informed site selection, the use of physical barriers such as skirts around fish net pens, emergency or early harvest, or moving stock to offshore areas [6,234]. Novel technologies, such as floating closed containment systems, are driving innovation in aquaculture system design given they may offer protection against HABs as well as disease and temperature [236]. Alternatively, land-based recirculating aquaculture systems offer ultimate control in water quality for high-value aquaculture species. There remain, however, large knowledge gaps on the effects of HABs, notably in conjunction with increased temperature (and other climate change stressors) and research should focus on the effects of these and other relevant multiple stressors.

5. Materials and Methods

5.1. Sampling, PCR Conditions and High-Throughput Sequencing

Seawater samples (100 mL) were collected from around the South Island of New Zealand as part of the New Zealand Marine Phytoplankton Monitoring Programme during routine weekly phytoplankton monitoring. Samples containing cells of potentially ichthyotoxic species (as determined by the Cawthron Phytoplankton Monitoring Laboratory by light microscopy analysis) were filtered (Durapore membrane filters, 0.45 μm, Millipore, Bedford, OH, USA) and stored at −20 °C until DNA extraction. Genomic DNA was extracted using DNeasy PowerSoil isolation kits (Qiagen, Valencia, CA, USA) following the manufacturer’s instructions using an automated homogenizer (1600 MiniG Automated Tissue Homogenizer and Cell Lyser, SPEX SamplePrep, Metuchen, NJ, USA) and a robotic workstation for DNA extraction (QIAcube, Qiagen). Negative extraction controls were performed every 23 samples. For each sample, gene regions were amplified by Polymerase Chain Reaction (PCR), using the primers list in Supplementary Table S1 The primers were modified to include IlluminaTM overhang adaptors following the dual-indexing method described in [237]. All PCR reactions were undertaken in duplicates with 450 nM of each primer, 13 µL of 2× MyFi™ Mix (Bioline, London, UK), ca. 5 ng of DNA, and sterile water for a total reaction volume of 25 µL. Cycling conditions were: 95 °C for 5 min, followed by 32 cycles of 95 °C for 30 s, 54 °C for 30 s, 72 °C for 45 s, and a final extension of 72 °C for 7 min for the 18S and 28S regions; and 98 °C for 30 s, followed by 35 cycles of 98 °C for 10 s, 58 °C for 30 s, 72 °C for 30 s, and a final extension of 72 °C for 10 min for the 18S haptophytes and 28S haptophytes target regions. Duplicates of PCR products were pooled and visualized on 1.5% agarose gel with Red Safe™ DNA Loading Dye (Herogen Biotech) and UV illumination. PCR negatives were run to assess for contamination during the PCR steps. The PCR products were purified, cleaned of primer dimers, and normalized using SequalPrep Normalization plate (ThermoFisher, Waltham, MA, USA), and submitted to Auckland Genomics (University of Auckland, New Zealand) for library preparation. Sequencing adapters and sample-specific indices were added to each amplicon via a second round of PCR using the Nextera™ Index kit (Illumina Inc., San Diego, CA, USA). Amplicons were pooled into a single library and paired-end sequences (2 × 250 bp) generated on a MiSeq® instrument. The sequencing libraries were prepared following the Illumina 16S Metagenomics Library Prep manual. Quality control was undertaken using a bioanalyzer before the library was diluted to 4 nM and denatured. A 15% PhiX spike was used, and the final loading concentration was 7 pM. Sequence data were automatically demultiplexed using MiSeqR Reporter (version 2, Illumina Inc.), and forward and reverse reads assigned to samples. Raw sequence reads were deposited in the National Center for Biotechnology Information (NCBI) short read archive under the accession number PRJNAXX.

5.2. Amplicon Sequence Variant Inference and Taxonomic Assignments

Bioinformatic pipelines for all of the rRNA genes were identical unless otherwise stated. Raw reads were processed, after primers being removed with cutadapt [238], using the DADA2 package [239] within R. Reads were truncated to 228 and 230 bp and filtered with a maxEE (maximum number of “expected errors”) of 2 and 4 for forward and reverse reads, respectively (reads not reaching this threshold were discarded). DADA2 constructs a parametric error matrix (based on the first 108 bps in the dataset), the samples are dereplicated and sequence variants for the forward and reverse reads are inferred based on the derived error profiles from the samples. Singletons observed in the inference step are discarded. Subsequently, paired-end reads were merged with a maximum mismatch of 1 bp and a required minimum overlap of 10 bp. Forward and reverse reads, which did not merge were not included in further analysis. Chimeras were removed using the function removeBimeraDenovo. The resulting chimera-checked, merged amplicon sequence variants (ASVs) were used for taxonomic classification using the PR2 database [240] for the 18S and the 18S haptophytes datasets, the LSU database [241] for the 28S dataset, and the LSU Haptophyta database [242] for the 28S haptophytes dataset. The sequences were classified based on the rdp classifier [243] with a bootstrap of 50 to be able to get classifications at higher taxonomic levels. The results were parsed into a table using the phyloseq package [244], and negative controls were assessed and the sum of reads from contaminating ASVs was subtracted from the samples. For comparisons between samples, subsampling to an even depth was undertaken for each sample at a depth of 10,000 reads for the 18S and 28S datasets, and 4000 reads for the smaller 18S haptophytes and 28S haptophytes datasets.
Stacked bar plots and taxonomy tables were generated using the package ggplot2 [245] in R based on the average relative abundance of sequence reads attributed to a given taxonomy at each location sites.

Supplementary Materials

The following supporting information can be downloaded at: https://www.mdpi.com/article/10.3390/toxins14050341/s1, Table S1: Details of the primers used in this study for the high-throughput sequencing metabarcoding analyses [246,247,248]; Table S2: Sea water samples from around the South Island of New Zealand, collected as part of the New Zealand Marine Phytoplankton Monitoring Programme and containing cells of potentially ichthyotoxic species were analysed using high-throughput sequencing metabarcoding using the four primer pairs listed in Supplementary Table S1. The resulting taxonomic classifications of eukaryotic phytoplankton types that are associated with harmful effects are listed. No raphidophytes or dictyochophytes were detected.

Author Contributions

A.R.: conceptualization, writing—original draft preparation, writing—review and editing, and project administration. L.R.: conceptualization, writing—original draft preparation, and writing—review and editing. K.S.H.: funding acquisition, and writing—review and editing. L.B.: data acquisition, formal analysis, and writing—original draft preparation. T.B.: data acquisition, and writing—review and editing. L.M.: data acquisition, and writing—review and editing. J.E.S.: funding acquisition, and writing—review and editing. K.F.S.: funding acquisition, conceptualization, formal analysis, writing—original draft preparation, and writing—review and editing. All authors have read and agreed to the published version of the manuscript.

Funding

This work was funded by the New Zealand Ministry of Business, Innovation and Employment [CAWX1707], [CAWX1606], and [CAWX1801].

Institutional Review Board Statement

Not applicable.

Informed Consent Statement

Not applicable.

Data Availability Statement

Not applicable.

Acknowledgments

We thank Tom Trnski, Auckland War Memorial Museum, for expert advice on finfish; Bente Edvardsen (University of Oslo) for help with metabarcoding analyses; Jacqui Stuart (Cawthron) for creating Figure 1; and Eden Cartwright (Bird Circus.com) for graphic design. This work was funded by the New Zealand Ministry of Business, Innovation and Employment CAWX1707, CAWX1606, and CAWX1801.

Conflicts of Interest

The authors declare no conflict of interest.

References

  1. Anderson, D.M.; Cembella, A.D.; Hallegraeff, G.M. Progress in understanding harmful algal blooms: Paradigm shifts and new technologies for research, monitoring, and management. Annu. Rev. Mar. Sci. 2012, 4, 143–176. [Google Scholar] [CrossRef] [PubMed] [Green Version]
  2. Landsberg, J.H. The effects of harmful algal blooms on aquatic organisms. Rev. Fish. Sci. 2002, 10, 113–390. [Google Scholar] [CrossRef]
  3. Shumway, S.E. A review of the effects of algal blooms on shellfish and aquaculture. J. World Aquac. Soc. 1990, 21, 65–104. [Google Scholar] [CrossRef]
  4. Van Dolah, F.M. Marine algal toxins: Origins, health effects, and their increased occurrence. Environ. Health Perspect. 2000, 108, 133–141. [Google Scholar] [CrossRef] [Green Version]
  5. Hallegraeff, G.M. Ocean climate change, phytoplankton community responses, and harmful algal blooms: A formidable predictive challenge. J. Phycol. 2010, 46, 220–235. [Google Scholar] [CrossRef]
  6. Brown, A.R.; Lilley, M.; Shutler, J.; Lowe, C.; Artioli, Y.; Torres, R.; Berdalet, E.; Tyler, C.R. Assessing risks and mitigating impacts of harmful algal blooms on mariculture and marine fisheries. Rev. Aquac. 2020, 12, 1663–1688. [Google Scholar] [CrossRef] [Green Version]
  7. Hoagland, P.; Scatasta, S. The economic effects of harmful algal blooms. In Ecology of Harmful Algae; Granéli, E., Turner, J.T., Eds.; Springer: Berlin/Heidelberg, Germany, 2006; pp. 391–402. [Google Scholar]
  8. Martino, S.; Gianella, F.; Davidson, D. An approach for evaluating the economic impacts of harmful algal blooms: The effects of blooms of toxic Dinophysis spp. on the productivity of Scottish shellfish farms. Harmful Algae 2020, 99, 101912. [Google Scholar] [CrossRef]
  9. Trainer, V.L. Global HAB: Evaluating, Reducing and Mitigating the Cost of Harmful Algal Blooms: A Compendium of Case Studies; North Pacific Marine Science Organization: Sidney, BC, Canada, 2020; 107p. [Google Scholar]
  10. Flewelling, L.; Naar, J.; Abbott, J.; Baden, D.; Barros, N.; Bossart, G.; Dechraoui Bottein, M.-Y.; Hammond, D.; Haubold, E.; Heil, C.; et al. Brevetoxicosis: Red tides and marine mammal mortalities. Nature 2005, 435, 755–756. [Google Scholar] [CrossRef] [Green Version]
  11. Leverone, J.R.; Blake, N.J.; Pierce, R.H.; Shumway, S.E. Effects of the dinoflagellate Karenia brevis on larval development in three species of bivalve mollusc from Florida. Toxicon 2006, 48, 75–84. [Google Scholar] [CrossRef]
  12. Rolton, A.; Vignier, J.; Soudant, P.; Shumway, S.E.; Bricelj, V.M.; Volety, A.K. Effects of the red tide dinoflagellate, Karenia brevis, on early development of the eastern oyster Crassostrea virginica and northern quahog Mercenaria mercenaria. Aquat. Toxicol. 2014, 155, 199–206. [Google Scholar] [CrossRef]
  13. Rolton, A.; Vignier, J.; Volety, A.K.; Pierce, R.H.; Henry, M.; Shumway, S.E.; Bricelj, V.M.; Hégaret, H.; Soudant, P. Effects of field and laboratory exposure to the toxic dinoflagellate Karenia brevis on the reproduction of the eastern oyster, Crassostrea virginica, and subsequent development of offspring. Harmful Algae 2016, 57, 13–26. [Google Scholar] [CrossRef] [PubMed]
  14. Rolton, A.; Vignier, J.; Volety, A.K.; Shumway, S.E.; Bricelj, V.M.; Soudant, P. Impacts of exposure to the toxic dinoflagellate Karenia brevis on reproduction of the northern quahog, Mercenaria mercenaria. Aquat. Toxicol. 2018, 202, 153–162. [Google Scholar] [CrossRef] [PubMed]
  15. Lenzen, M.; Li, M.; Murray, S.A. Impacts of harmful algal blooms on marine aquaculture in a low-carbon future. Harmful Algae 2021, 110, 102143. [Google Scholar] [CrossRef] [PubMed]
  16. Castrec, J.; Hégaret, H.; Huber, M.; Le Grand, J.; Huvet, A.; Tallec, K.; Boulais, M.; Soudant, P.; Fabioux, C. The toxic dinoflagellate Alexandrium minutum impairs the performance of oyster embryos and larvae. Harmful Algae 2020, 92, 101744. [Google Scholar] [CrossRef] [PubMed]
  17. Castrec, J.; Fabioux, C.; Le Goïc, N.; Boulais, M.; Soudant, P.; Hégaret, H. The toxic dinoflagellate Alexandrium minutum affects oyster gamete health and fertilization potential. Mar. Environ. Res. 2021, 169, 105401. [Google Scholar] [CrossRef]
  18. Corriere, M.; Soliño, L.; Costa, P.R. Effects of the marine biotoxins okadaic acid and dinophysistoxins on fish. J. Mar. Sci. Eng. 2021, 9, 293. [Google Scholar] [CrossRef]
  19. Costa, P.R. Impact and effects of paralytic shellfish poisoning toxins derived from harmful algal blooms to marine fish. Fish Fish. 2016, 17, 226–248. [Google Scholar] [CrossRef]
  20. Gosselin, L.A.; Qian, P.Y. Juvenile mortality in benthic marine invertebrates. Mar. Ecol. Prog. Ser. 1997, 146, 265–282. [Google Scholar] [CrossRef]
  21. Pechenik, J.A. Environmental influences on larval survival and development. In Reproduction of Marine Invertebrates; Giese, A.C., Pearse, J.S., Pearse, V.B., Eds.; Blackwell Scientific Publications: Palo Alto, CA, USA, 1987; p. 551e608. [Google Scholar]
  22. Rolton, A.; Soudant, P.; Vignier, J.; Pierce, R.; Henry, M.; Shumway, S.E.; Bricelj, V.M.; Volety, A.K. Susceptibility of gametes and embryos of the eastern oyster, Crassostrea virginica, to Karenia brevis and its toxins. Toxicon 2015, 99, 6–15. [Google Scholar] [CrossRef]
  23. Matsuyama, Y.; Oda, T. Toxic effects of harmful algal blooms on finfish and shellfish. In Handbook of Algal Science, Technology and Medicine (Part IX: Algal Toxicology, Chapter 34th); Konur, O., Ed.; Academic Press: London, UK, 2020; pp. 543–560. [Google Scholar]
  24. Davidson, K.; Jardine, S.L.; Martino, S.; Myre, G.B.; Peck, L.E.; Raymond, R.N.; West, J.J. The Economic Impacts of Harmful Algal Blooms on Salmon Cage Aquaculture. In GlobalHAB. Evaluating, Reducing and Mitigating the Cost of Harmful Algal Blooms: A Compendium of Case Studies; Trainer, V.L., Ed.; North Pacific Marine Science Organization: Sidney, BC, Canada, 2020; 107p. [Google Scholar]
  25. Hallegraeff, G.M.; Schweibold, L.; Jaffrezic, E.; Rhodes, L.; MacKenzie, L.; Hay, B.; Farrell, H. Overview of Australian and New Zealand harmful algal species occurrences and their societal impacts in the period 1985 to 2018, including a compilation of historic records. Harmful Algae 2021, 102, 101848. [Google Scholar] [CrossRef]
  26. King, T.L.; Nguyen, N.; Doucette, G.J.; Wang, Z.; Bill, B.D.; Peacock, M.B.; Madera, S.L.; Elston, R.A.; Trainer, V.L. Hiding in plain sight: Shellfish-killing phytoplankton in Washington State. Harmful Algae 2021, 105, 102032. [Google Scholar] [CrossRef] [PubMed]
  27. Samdal, I.A.; Edvardsen, B. Massive salmon mortalities during a Chrysochromulina leadbeateri bloom in Northern Norway. Harmful Algae News 2020, 64, 4–5. [Google Scholar]
  28. Rhodes, L.; Edwards, A.R.; Bojo, O.; Chang, F.H. Phylum Haptophyta. In New Zealand Inventory of Biodiversity Volume 3: Kingdoms, Bacteria, Protozoa, Chromista, Plantae and Fungi; Gordon, D.P., Ed.; Canterbury University Press: Christchurch, New Zealand, 2011; Volume 3, pp. 312–321. [Google Scholar]
  29. Basti, L.; Endo, M.; Segawa, S. Physiological, pathological, and defense alterations in Manila clams (short-neck clams), Ruditapes philippinarum, induced by Heterocapsa circularisquama. J. Shellfish. Res. 2011, 30, 829–844. [Google Scholar] [CrossRef]
  30. Galimany, E.; Sunila, I.; Hégaret, H.; Ramón, M.; Wikfors, G.H. Experimental exposure of the blue mussel (Mytilus edulis, L.) to the toxic dinoflagellate Alexandrium fundyense: Histopathology, immune responses, and recovery. Harmful Algae 2008, 7, 702–711. [Google Scholar] [CrossRef]
  31. Galimany, E.; Sunila, I.; Hégaret, H.; Ramón, M.; Wikfors, G.H. Pathology and immune response of the blue mussel (Mytilus edulis L.) after an exposure to the harmful dinoflagellate Prorocentrum minimum. Harmful Algae 2008, 7, 630–638. [Google Scholar] [CrossRef]
  32. Hégaret, H.; Wikfors, G.H.; Shumway, S.E. Diverse feeding responses of five species of bivalve mollusc when exposed to three species of Harmful Algae. J. Shellfish. Res. 2007, 26, 549–559. [Google Scholar] [CrossRef]
  33. Hégaret, H.; Da Silva, P.M.; Wikfors, G.H.; Haberkorn, H.; Shumway, S.E.; Soudant, P. In vitro interactions between several species of harmful algae and haemocytes of bivalve molluscs. Cell Biol. Toxicol. 2011, 27, 249–266. [Google Scholar] [CrossRef]
  34. Shumway, S.E.; Cucci, T.L. The effects of the toxic dinoflagellate Protogonyaulax tamarensis on the feeding and behavior of bivalve molluscs. Aquat. Toxicol. 1987, 10, 9–27. [Google Scholar] [CrossRef]
  35. Wikfors, G.H.; Smolowitz, R.M. Experimental and Histological Studies of Four Life-History Stages of the Eastern Oyster, Crassostrea virginica, exposed to a Cultured Strain of the Dinoflagellate Prorocentrum minimum. Biol Bull. 1995, 188, 313–328. [Google Scholar] [CrossRef]
  36. Aquaculture New Zealand. Aquaculture New Zealand, New Zealand Aquaculture: A Sector Overview with Key Facts and Statistics; Aquaculture New Zealand Industry—Aquaculture New Zealand: Nelson, New Zealand, 2020; pp. 1–26. [Google Scholar]
  37. FAO. Fishery and Aquaculture Statistics. Global aquaculture production 1950–2019 (FishstatJ). In FAO Fisheries Division; FAO: Rome, Italy, 2021; Available online: https://www.fao.org/fishery/statistics/software/fishstatj/en (accessed on 10 March 2022).
  38. Atalah, J.; Forrest, B.M. Forecasting mussel settlement using historical data and boosted regression trees. Aquac. Environ. Interact. 2019, 11, 625–638. [Google Scholar] [CrossRef] [Green Version]
  39. How Climate Change Affects New Zealand. Ministry for the Environment. Available online: https://environment.govt.nz/facts-and-science/climate-change/how-climate-change-affects-new-zealand/ (accessed on 14 April 2022).
  40. Oldham, K.; (Marine Farming Association, Blenheim, New Zealand). Personal communication, 2021.
  41. Chang, F.H.; Anderson, C.; Boustead, N.C. First record of a Heterosigma (Raphidophyceae) bloom with associated mortality of cage-reared salmon in Big Glory Bay, New Zealand. N. Z. J. Mar. Freshw. Res. 1990, 24, 461–469. [Google Scholar] [CrossRef]
  42. MacKenzie, L.; Truman, P.; Mountfort, D.; White, D. Dinophysis acuta blooms and associated shellfish toxicity in New Zealand. In Proceedings of the VIII International Conference on Harmful Algae-Abstracts and Posters Classification, Vigo, Spain, 25–29 June 1997. [Google Scholar]
  43. MacKenzie, L.; Smith, K.F.; Rhodes, L.L.; Brown, A.; Langi, V.; Edgar, M.; Lovell, G.; Preece, M. Mortalities of sea-cage salmon (Oncorhynchus tshawytscha) due to a bloom of Pseudochattonella verruculosa (Dictyophyceae) in Queen Charlotte Sound, New Zealand. Harmful Algae 2011, 11, 45–53. [Google Scholar] [CrossRef]
  44. MacKenzie, L.; Harwood, T.; Boundy, M.; Smith, K.; Knight, B.; Jiang, W.; McNabb, P.; Selwood, A.; van Ginkel, R.; Langi, V.; et al. An Alexandrium catenella bloom and associated saxitoxin contamination of shellfish, Queen Charlotte Sound, March–June 2011. In A Report for MAF Food Safety; Cawthron Institute: Nelson, New Zealand, 2011; 38p. [Google Scholar]
  45. MacKenzie, L. The risk to New Zealand shellfish aquaculture from paralytic shellfish poisoning (PSP) toxins. N. Z. J. Mar. Freshw. Res. 2014, 48, 430–465. [Google Scholar] [CrossRef] [Green Version]
  46. Liu, H.; Kelly, M.S.; Campbell, D.A.; Dong, S.L.; Zhu, J.X.; Wang, S.F. Exposure to domoic acid affects larval development of king scallop Pecten maximus (Linnaeus, 1758). Aquat. Toxicol. 2007, 81, 152–158. [Google Scholar] [CrossRef]
  47. Sauvey, A.; Denis, F.; Hégaret, H.; Le Roy, B.; Lelong, C.; Jolly, O.; Pavie, M.; Fauchot, J. Interactions between Filter-Feeding Bivalves and Toxic Diatoms: Influence on the Feeding Behavior of Crassostrea gigas and Pecten maximus and on Toxin Production by Pseudo-nitzschia. Toxins 2021, 13, 577. [Google Scholar] [CrossRef]
  48. Mafra, L.L.; Bricelj, V.M.; Ouellette, C.; Leger, C.; Bates, S.S. Mechanisms contributing to low domoic acid uptake by oysters feeding on Pseudo-nitzschia cells. I. Filtration and pseudofeces production. Aquat. Biol. 2009, 6, 201–212. [Google Scholar] [CrossRef] [Green Version]
  49. Mafra, L.L.; Bricelj, V.M.; Ward, J.E. Mechanisms contributing to low domoic acid uptake by oysters feeding on Pseudo-nitzschia cells. II. Selective rejection. Aquat. Biol. 2009, 6, 213–226. [Google Scholar] [CrossRef]
  50. Thessen, A.E.; Soniat, T.M.; Dortch, Q.; Doucette, G.J. Crassostrea virginica grazing on toxic and non-toxic diatoms. Toxicon 2010, 55, 570–579. [Google Scholar] [CrossRef]
  51. Mafra, L.L.; Bricelj, V.M.; Ouellette, C.; Bates, S.S. Feeding mechanics as the basis for differential uptake of the neurotoxin domoic acid by oysters, Crassostrea virginica, and mussels, Mytilus edulis. Aquat. Toxicol. 2010, 97, 160–171. [Google Scholar] [CrossRef]
  52. De Rijcke, M.; Vandegehuchte, M.B.; Bussche, J.V.; Nevejan, N.; Vanhaecke, L.; De Schamphelaere, K.A.C.; Janssen, C.R. Common European harmful algal blooms affect the viability and innate immune responses of Mytilus edulis larvae. Fish Shellfish. Immunol. 2015, 47, 175–181. [Google Scholar] [CrossRef]
  53. Jones, T.O.; Whyte, J.N.; Ginther, N.G.; Townsend, L.D.; Iwama, G.K. Haemocyte changes in the Pacific oyster, Crassostrea gigas, caused by exposure to domoic acid in the diatom Pseudonitzschia pungens f. multiseries. Toxicon 1995, 33, 347–353. [Google Scholar] [CrossRef]
  54. Delegrange, A.; Vincent, D.; Courcot, L.; Amara, R. Testing the vulnerability of juvenile sea bass (Dicentrarchus labrax) exposed to the harmful algal bloom (HAB) species Pseudo-nitzschia delicatissima. Aquaculture 2015, 437, 167–174. [Google Scholar] [CrossRef]
  55. Marsden, I.D.; Contreras, A.M.; MacKenzie, L.; Munro, M.H.G. A comparison of the physiological responses, behaviour and biotransformation of paralytic shellfish poisoning toxins in a surf-clam (Paphies donacina) and the green-lipped mussel (Perna canaliculus). Mar. Freshw. Res. 2016, 67, 1163–1174. [Google Scholar] [CrossRef]
  56. Marsden, I.D.; Shumway, S.E. Effects of the toxic dinoflagellate Alexandrium tamarense on the greenshell mussel Perna canaliculus. N. Z. J. Mar. Freshw. Res. 1992, 26, 371–378. [Google Scholar] [CrossRef]
  57. Rolton, A.; Cawthron Institute, New Zealand. Unpublished data. 2021.
  58. Contreras, A.M.; Marsden, I.D.; Munro, M.H.G. Effects of short-term exposure to paralytic shellfish toxins on clearance rates and toxin uptake in five species of New Zealand bivalve. Mar. Freshw. Res. 2012, 63, 166–174. [Google Scholar] [CrossRef]
  59. Contreras, A.M.; Marsden, I.D.; Munro, M.H.G. Physiological effects and biotransformation of PSP toxins in the New Zealand scallop, Pecten novaezelandiae. J. Shellfish. Res. 2012, 31, 1151–1159. [Google Scholar] [CrossRef]
  60. Gainey, L.F., Jr.; Shumway, S.E. Physiological effects of Protogonyaulax tamarensis on cardiac activity in bivalve molluscs. Comp. Biochem. Physiol. Part C Comp. Pharmacol. 1988, 91, 159–164. [Google Scholar] [CrossRef]
  61. Lesser, M.P.; Shumway, S.E. Effects of toxic dinoflagellates on clearance rates and survival in juvenile bivalve molluscs. J. Shellfish Res. 1993, 12, 377–381. [Google Scholar]
  62. Shumway, S.E.; Pierce, F.C.; Knowlton, K. The effects of Protogonyaulax tamarensis on byssus production in Mytilus edulis L., Modiolus modiolus Linnaeus, 1758 and Geukensia demissa Dillwyn. Comp. Biochem. Physiol. A. 1987, 87, 1021–1023. [Google Scholar] [CrossRef]
  63. Lassudrie, M.; Soudant, P.; Nicolas, J.L.; Miner, P.; Le Grand, J.; Lambert, C.; Le Goïc, N.; Hégaret, H.; Fabioux, C. Exposure to the toxic dinoflagellate Alexandrium catenella modulates juvenile oyster Crassostrea gigas hemocyte variables subjected to different biotic conditions. Fish Shellfish Immunol. 2016, 51, 104–115. [Google Scholar] [CrossRef] [Green Version]
  64. Yan, T.; Zhou, M.; Fu, M.; Wang, Y.; Yu, R.; Li, J. Inhibition of egg hatching success and larvae survival of the scallop, Chlamys farreri, associated with exposure to cells and cell fragments of the dinoflagellate Alexandrium tamarense. Toxicon 2001, 39, 1239–1244. [Google Scholar] [CrossRef]
  65. Yan, T.; Zhou, M.; Fu, M.; Yu, R.; Wang, Y.; Li, J. Effects of the dinoflagellate Alexandrium tamarense on early development of the scallop Argopecten irradians concentricus. Aquaculture 2003, 217, 167–178. [Google Scholar] [CrossRef]
  66. Castrec, J.; Soudant, P.; Payton, L.; Tran, D.; Miner, P.; Lambert, C.; Le Goïc, N.; Huvet, A.; Quillien, V.; Boullot, F.; et al. Bioactive extracellular compounds produced by the dinoflagellate Alexandrium minutum are highly detrimental for oysters. Aquat. Toxicol. 2018, 199, 188–198. [Google Scholar] [CrossRef] [PubMed] [Green Version]
  67. Castrec, J.; Hégaret, H.; Alunno-Bruscia, M.; Picard, M.; Soudant, P.; Petton, B.; Boulais, M.; Suquet, M.; Quéau, I.; Ratiskol, D.; et al. The dinoflagellate Alexandrium minutum affects development of the oyster Crassostrea gigas, through parental or direct exposure. Environ. Pollut. 2019, 246, 827–836. [Google Scholar] [CrossRef] [PubMed] [Green Version]
  68. Haberkorn, H.; Lambert, C.; Le Goïc, N.; Moal, J.; Suquet, M.; Guéguen, M.; Sunila, I.; Soudant, P. Effects of Alexandrium minutum exposure on nutrition-related processes and reproductive output in oysters Crassostrea gigas. Harmful Algae 2010, 9, 427–439. [Google Scholar] [CrossRef] [Green Version]
  69. Haberkorn, H.; Lambert, C.; Le Goïc, N.; Quéré, C.; Bruneau, A.; Riso, R.; Auffret, M.; Soudant, P. Cellular and biochemical responses of the oyster Crassostrea gigas to controlled exposures to metals and Alexandrium minutum. Aquat. Toxicol. 2014, 147, 158–167. [Google Scholar] [CrossRef] [Green Version]
  70. Fabioux, C.; Sulistiyani, Y.; Haberkorn, H.; Hégaret, H.; Soudant, P. Exposure to toxic Alexandrium minutum activates the antioxidant and detoxifying systems of the oyster Crassostrea Gigas. Harmful Algae 2015, 48, 55–62. [Google Scholar] [CrossRef] [Green Version]
  71. Lassus, P.; Bardouil, M.; Beliaeff, B.; Masselin, P.; Naviner, M.; Truquet, P. Effect of a continuous supply of the toxic dinoflagellate Alexandrium minutum Halim on the feeding behavior of the Pacific oyster (Crassostrea gigas Thunberg). J. Shellfish. Res. 1999, 18, 211–216. [Google Scholar]
  72. Mat, A.M.; Haberkorn, H.; Bourdineaud, J.P.; Massabuau, J.C.; Tran, D. Genetic and genotoxic impacts in the oyster Crassostrea gigas exposed to the harmful alga Alexandrium minutum. Aquat. Toxicol. 2013, 140, 458–465. [Google Scholar] [CrossRef]
  73. Tran, D.; Ciutat, A.; Mat, A.; Massabuau, J.C.; Hégaret, H.; Lambert, C.; Le Goïc, N.; Soudant, P. The toxic dinoflagellate Alexandrium minutum disrupts daily rhythmic activities at gene transcription, physiological and behavioral levels in the oyster Crassostrea gigas. Aquat. Toxicol. 2015, 158, 41–49. [Google Scholar] [CrossRef]
  74. Le Goïc, N.; Hégaret, H.; Boulais, M.; Béguel, J.P.; Lambert, C.; Fabioux, C.; Soudant, P. Flow cytometric assessment of morphology, viability, and production of reactive oxygen species of Crassostrea gigas oocytes. Application to Toxic dinoflagellate (Alexandrium minutum) exposure. Cytom. Part A 2014, 85, 1049–1056. [Google Scholar] [CrossRef] [PubMed] [Green Version]
  75. Borcier, E.; Morvezen, R.; Boudry, P.; Miner, P.; Charrier, G.; Laroche, J.; Hégaret, H. Effects of bioactive extracellular compounds and paralytic shellfish toxins produced by Alexandrium minutum on growth and behaviour of juvenile great scallops Pecten maximus. Aquat. Toxicol. 2017, 184, 142–154. [Google Scholar] [CrossRef] [PubMed] [Green Version]
  76. Taylor, F.J.; Taylor, N.J.; Walsby, J.R. A Bloom of the planktonic diatom, Cerataulina pelagica, off the coast of northeastern New Zealand in 1983, and its contribution to an associated mortality of fish and benthic fauna. Int. Rev. Hydrobiol. 1985, 70, 773–795. [Google Scholar] [CrossRef]
  77. MacKenzie, L.; Sims, I.; Beuzenberg, V.; Gillespie, P. Mass accumulation of mucilage caused by dinoflagellate polysaccharide exudates in Tasman Bay, New Zealand. Harmful Algae 2002, 1, 69–83. [Google Scholar] [CrossRef]
  78. Mello, D.F.; Proença, L.A.D.O.; Barracco, M.A. Comparative study of various immune parameters in three bivalve species during a natural bloom of Dinophysis acuminata in Santa Catarina Island, Brazil. Toxins 2010, 2, 1166–1178. [Google Scholar] [CrossRef] [PubMed]
  79. Simões, E.; Vieira, R.C.; Schramm, M.A.; Mello, D.F.; Pontinha, V.D.A.; Da Silva, P.M.; Barracco, M.A. Impact of harmful algal blooms (Dinophysis acuminata) on the immune system of oysters and mussels from Santa Catarina, Brazil. J. Mar. Biol. Assoc. UK 2015, 95, 773–781. [Google Scholar] [CrossRef]
  80. Gaillard, S.; Le Goïc, N.; Malo, F.; Boulais, M.; Fabioux, C.; Zaccagnini, L.; Carpentier, L.; Sibat, M.; Réveillon, D.; Séchet, V.; et al. Cultures of Dinophysis sacculus, D. acuminata and pectenotoxin 2 affect gametes and fertilization success of the Pacific oyster, Crassostrea gigas. Environ. Pollut. 2020, 265, 114840. [Google Scholar] [CrossRef]
  81. Glibert, P.M.; Landsberg, J.H.; Evans, J.J.; Al-Sarawi, M.A.; Faraj, M.; Al-Jarallah, M.A.; Haywood, A.; Ibrahem, S.; Klesius, P.; Powell, C.; et al. A fish kill of massive proportion in Kuwait Bay, Arabian Gulf, 2001: The roles of bacterial disease, harmful algae, and eutrophication. Harmful Algae 2002, 1, 215–231. [Google Scholar] [CrossRef]
  82. Mee, L.D.; Espinosa, M.; Diaz, G. Paralytic shellfish poisoning with a Gymnodinium catenatum red tide on the Pacific coast of Mexico. Mar. Environ. Res. 1986, 19, 77–92. [Google Scholar] [CrossRef]
  83. García-Lagunas, N.; Romero-Geraldo, R.; Hernández-Saavedra, N.Y. Genomics study of the exposure effect of Gymnodinium catenatum, a paralyzing toxin producer, on Crassostrea gigas’ defense system and detoxification genes. PLoS ONE 2013, 8, e72323. [Google Scholar] [CrossRef] [Green Version]
  84. García-Lagunas, N.; de Jesus Romero-Geraldo, R.; Hernández-Saavedra, N.Y. Changes in gene expression and histological injuries as a result of exposure of Crassostrea gigas to the toxic dinoflagellate Gymnodinium catenatum. J. Molluscan Stud. 2016, 82, 193–200. [Google Scholar]
  85. Matsuyama, Y.; Usuki, H.; Uchida, T.; Kotani, Y. Effects of harmful algae on the early planktonic larvae of the oyster, Crassostrea gigas. In Harmful Algal Blooms 2000; Hallegraeff, G.M., Blackburn, S.I., Bolch, C.J., Lewis, R.J., Eds.; UNESCO: Paris, France, 2001; pp. 411–414. [Google Scholar]
  86. Estrada, N.; Ascencio, F.; Shoshani, L.; Contreras, R.G. Apoptosis of hemocytes from lions-paw scallop Nodipecten subnodosus induced with paralyzing shellfish poison from Gymnodinium catenatum. Immunobiology 2014, 219, 964–974. [Google Scholar] [CrossRef] [PubMed]
  87. Estrada, N.; Rodríguez-Jaramillo, C.; Contreras, G.; Ascencio, F. Effects of induced paralysis on hemocytes and tissues of the giant lions-paw scallop by paralyzing shellfish poison. Mar. Biol. 2010, 157, 1401–1415. [Google Scholar] [CrossRef]
  88. Escobedo-Lozano, A.Y.; Estrada, N.; Ascencio, F.; Contreras, G.; Alonso-Rodriguez, R. Accumulation, biotransformation, histopathology and paralysis in the Pacific calico scallop Argopecten ventricosus by the paralyzing toxins of the dinoflagellate Gymnodinium catenatum. Mar. Drugs 2012, 10, 1044–1065. [Google Scholar] [CrossRef] [PubMed]
  89. Chang, F.H. Gymnodinium brevisulcatum sp. Nov. (Gymnodiniales, Dinophyceae), a new species isolated from the 1998 summer toxic bloom in Wellington Harbour, New Zealand. Phycologia 1999, 38, 377–384. [Google Scholar] [CrossRef]
  90. Holland, P.T.; Shi, F.; Satake, M.; Hamamoto, Y.; Ito, E.; Beuzenberg, V.; McNabb, P.; Munday, R.; Briggs, L.; Truman, P.; et al. Novel toxins produced by the dinoflagellate Karenia brevisulcata. Harmful Algae 2012, 13, 47–57. [Google Scholar] [CrossRef]
  91. Shi, F.; McNabb, P.; Rhodes, L.; Holland, P.; Webb, S.; Adamson, J.; Immers, A.; Gooneratne, R.; Holland, J. The toxic effects of three dinoflagellate species from the genus Karenia on invertebrate larvae and finfish. N. Z. J. Mar. Freshw. Res. 2012, 46, 149–165. [Google Scholar] [CrossRef]
  92. Neely, T.; Campbell, L. A modified assay to determine hemolytic toxin variability among Karenia clones isolated from the Gulf of Mexico. Harmful Algae 2006, 5, 592–598. [Google Scholar] [CrossRef]
  93. Li, X.; Yan, T.; Yu, R.; Zhou, M. A review of Karenia mikimotoi: Bloom events, physiology, toxicity and toxic mechanism. Harmful Algae 2019, 90, 101702. [Google Scholar] [CrossRef]
  94. Sakamoto, S.; Lim, W.A.; Lu, D.; Dai, X.; Orlova, T.; Iwataki, M. Harmful algal blooms and associated fisheries damage in East Asia: Current status and trends in China, Japan, Korea and Russia. Harmful Algae 2021, 102, 101787. [Google Scholar] [CrossRef]
  95. PIRSA. Fish Kill Investigation: Coffin Bay Harmful Algal (Karenia mikimotoi) Bloom February 2014; Primary Industries and Aquaculture Division, Aquatic Animal Health Unit: Adelaide, Australia, 2014.
  96. Chang, F.H. A review of knowledge of a group of closely related, economically important toxic Gymnodinium/ Gyrodinium (Dinophyceae) species in New Zealand. J. R. Soc. N. Z. 1996, 26, 381–394. [Google Scholar] [CrossRef] [Green Version]
  97. Chang, F.H.; Ryan, K.G. Karenia concordia sp. nov.(Gymnodiniales, Dinophyceae), a new nonthecate dinoflagellate isolated from the New Zealand northeast coast during the 2002 harmful algal bloom events. Phycologia 2004, 43, 552–562. [Google Scholar] [CrossRef]
  98. Smith, K.; Rhodes, L.; Selwood, A.; Marfell, M.; Zeewoldt, C. Massive Karenia mikimotoi bloom in Northland, New Zealand: Use of traditional and molecular techniques for rapid identification of HAB species. Harmful Algae News 2007, 34, 1–3. [Google Scholar]
  99. Matsuyama, Y.; Koizumi, Y.; Uchida, T. Effect of harmful phytoplankton on the survival of the abalones. Bull. Nansei Natl. Fish. Res. Inst. 1998, 31, 19–24. [Google Scholar]
  100. Laabir, M.; Gentien, P. Survival of toxic dinoflagellates after gut passage in the Pacific oyster Crassostrea gigas Thunburg. J. Shellfish Res. 1999, 18, 217–222. [Google Scholar]
  101. Matsuyama, Y.; Uchida, T.; Honjo, T. Effects of harmful dinoflagellates, gymnodinium mikimotoi and heterocapsa circularisquama, red-tide on filtering rate of bivalve molluscs. Fish. Sci. 1999, 65, 248–253. [Google Scholar] [CrossRef] [Green Version]
  102. Widdows, J.; Moore, M.N.; Lowe, D.M.; Salkeld, P.N. Some effects of a dinoflagellate bloom (Gyrodinium aureolum) on the mussel, Mytilus edulis. J. Mar. Biol. Assoc. UK 1979, 59, 522–524. [Google Scholar] [CrossRef]
  103. Hégaret, H.; da Silva, P.M.; Wikfors, G.H.; Lambert, C.; De Bettignies, T.; Shumway, S.E.; Soudant, P. Hemocyte responses of Manila clams, Ruditapes philippinarum, with varying parasite, Perkinsus olseni, severity to toxic-algal exposures. Aquat. Toxicol. 2007, 84, 469–479. [Google Scholar] [CrossRef]
  104. Lin, J.N.; Yan, T.; Zhang, Q.C.; Wang, Y.F.; Liu, Q.; Zhou, M.J. Effects of Karenia mikimotoi blooms on antioxidant enzymes in gastropod abalone, Haliotis discus hannai. Mar. Sci. 2016, 40, 17–22. [Google Scholar]
  105. Basti, L.; Nagai, S.; Go, J.; Okano, S.; Nagai, K.; Watanabe, R.; Suzuki, T.; Tanaka, Y. Differential inimical effects of Alexandrium spp. and Karenia spp. on cleavage, hatching, and two larval stages of Japanese pearl oyster Pinctada fucata martensii. Harmful Algae 2015, 43, 1–12. [Google Scholar] [CrossRef]
  106. Basti, L.; Go, J.; Okano, S.; Higuchi, K.; Nagai, S.; Nagai, K. Sublethal and antioxidant effects of six ichthyotoxic algae on early-life stages of the Japanese pearl oyster. Harmful Algae 2021, 103, 102013. [Google Scholar] [CrossRef] [PubMed]
  107. Botes, L.; Sym, S.D.; Pitcher, G.C. Karenia cristata sp. nov. and Karenia bicuneiformis sp. nov.(Gymnodiniales, Dinophyceae): Two new Karenia species from the South African coast. Phycologia 2003, 42, 563–571. [Google Scholar] [CrossRef]
  108. Helm, M.M.; Hepper, B.T.; Spencer, B.E.; Walne, P.R. Lugworm mortalities and a bloom of Gyrodinium aureolum Hulburt in the eastern Irish Sea, autumn 1971. J. Mar. Biol. Assoc. UK 1974, 54, 857–869. [Google Scholar] [CrossRef]
  109. Go, J.; Nagai, K.; Segawa, S.; Honjo, T. Mortality and impact on life activity of Akoya pearl oysters caused by red tides of dinoflagellate Karenia mikimotoi. Nippon. Suisan Gakkaishi 2016, 82, 737–742. [Google Scholar] [CrossRef] [Green Version]
  110. MacKenzie LHaywood, A.; Adamson, J.; Truman, P.; Till, D.; Seki, T.; Satake, M.; Yasusmoto, T. Gymnodimine contamination of shellfish in New Zealand. In Harmful and Toxic Algal Blooms; Yasumoto, T., Oshima, Y., Fukuyo, Y., Eds.; Inter-Governmental Oceanographic Commission of UNESCO: Tokyo, Japan, 1996; pp. 97–100. [Google Scholar]
  111. de Salas, M.F.; Rhodes, L.L.; Mackenzie, L.A.; Adamson, J.E.; Ponikla, K. Gymnodinoid genera Karenia and Takayama (Dinophyceae) in New Zealand coastal waters. N. Z. J. Mar. Freshw. Res. 2005, 39, 135–139. [Google Scholar] [CrossRef]
  112. Mardones, J.I.; Norambuena, L.; Paredes, J.; Fuenzalida, G.; Dorantes-Aranda, J.J.; Chang, K.J.L.; Guzmán, L.; Krock, B.; Hallegraeff, G. Unraveling the Karenia selliformis complex with the description of a non-gymnodimine producing Patagonian phylotype. Harmful Algae 2020, 98, 101892. [Google Scholar] [CrossRef]
  113. Kuroda, H.; Azumaya, T.; Setou, T.; Hasegawa, N. Unprecedented Outbreak of Harmful Algae in Pacific Coastal Waters off Southeast Hokkaido, Japan, during Late Summer 2021 after Record-Breaking Marine Heatwaves. J. Mar. Sci. Eng. 2021, 9, 1335. [Google Scholar] [CrossRef]
  114. MacKenzie, L.; Cawthron Institute, New Zealand. Unpublished data. 2021.
  115. da Silva, P.M.; Hégaret, H.; Lambert, C.; Wikfors, G.H.; Le Goïc, N.; Shumway, S.E.; Soudant, P. Immunological responses of the Manila clam (Ruditapes philippinarum) with varying parasite (Perkinsus olseni) burden, during a long-term exposure to the harmful alga, Karenia selliformis, and possible interactions. Toxicon 2008, 51, 563–573. [Google Scholar] [CrossRef] [Green Version]
  116. de Salas, M.F.; Bolch, C.J.; Hallegraeff, G.M. Karenia umbella sp. nov. (Gymnodiniales, Dinophyceae), a new potentially ichthyotoxic dinoflagellate species from Tasmania, Australia. Phycologia 2004, 43, 166–175. [Google Scholar] [CrossRef]
  117. Rhodes, L.; Munday, R.; Briggs, L. Ostreopsis siamensis and palytoxin-related compounds in New Zealand: A risk to human health? In Proceedings of the 12th International Conference on Harmful Algae, Copenhagen, Denmark, 4–8 September 2006; International Society for the Study of Harmful Algae and Intergovernmental Oceanographic Commission of UNESCO: Copenhagen, Denmark, 2008; pp. 326–329. [Google Scholar]
  118. Shears, N.T.; Ross, P.M. Blooms of benthic dinoflagellates of the genus Ostreopsis; an increasing and ecologically important phenomenon on temperate reefs in New Zealand and worldwide. Harmful Algae 2009, 8, 916–925. [Google Scholar] [CrossRef]
  119. Chang, F.H.; Ryan, K.G. Prymnesium calathiferum sp. nov. (Prymnesiophyceae), a new species isolated from Northland, New Zealand. Phycologia 1985, 24, 191–198. [Google Scholar] [CrossRef]
  120. MacKenzie, L. Toxic and noxious phytoplankton in Big Glory Bay, Stewart Island, New Zealand. J. Appl. Phycol. 1991, 3, 19–34. [Google Scholar] [CrossRef]
  121. Black, E.A.; Whyth, J.N.C.; Bagshaw, J.W.; Ginther, N.G. The effects of Heterosigma akashiwo on juvenile Oncorhynchus tshawytscha and its implications for fish culture. J. Appl. Ichthyol. 1991, 7, 168–175. [Google Scholar] [CrossRef]
  122. Gaines, G.; Taylor, F.J.R. A mariculturist’s guide to potentially harmful marine phytoplankton of the Pacific coast North America. Marine Resources Section, Fisheries Branch, B.C. Ministry of the Environment. Inf. Rep. 1986, 10. [Google Scholar]
  123. Khan, S.; Arakawa, O.; Onoue, Y. Neurotoxins in a toxic red tide of Heterosigma akashiwo (Raphidophyceae) in Kagoshima Bay, Japan. Aquac. Res. 1997, 28, 9–14. [Google Scholar] [CrossRef]
  124. Banno, K.; Oda, T.; Nagai, K.; Nagai, S.; Tanaka, Y.; Basti, L. Deleterious effects of harmful dinoflagellates and raphidophytes on egg viability and spermatozoa swimming velocity in the Japanese pearl oyster Pinctada fucata martensii. J. Shellfish Res. 2018, 37, 41–48. [Google Scholar] [CrossRef]
  125. Basti, L.; Nagai, K.; Go, J.; Okano, S.; Oda, T.; Tanaka, Y.; Nagai, S. Lethal effects of ichthyotoxic raphidophytes, Chattonella marina, C. antiqua, and Heterosigma akashiwo, on post-embryonic stages of the Japanese pearl oyster, Pinctada fucata martensii. Harmful Algae 2016, 59, 112–122. [Google Scholar] [CrossRef]
  126. Wang, L.P.; Yan, T.; Zhou, M.J. Impacts of HAB species Heterosigma akashiwo on early development of the scallop Argopecten irradians Lamarck. Aquaculture 2006, 255, 374–383. [Google Scholar] [CrossRef]
  127. Keppler, C.J.; Hoguet, J.; Smith, K.; Ringwood, A.H.; Lewitus, A.J. Sublethal effects of the toxic alga Heterosigma akashiwo on the southeastern oyster (Crassostrea virginica). Harmful Algae 2005, 4, 275–285. [Google Scholar] [CrossRef]
  128. Keppler, C.J.; Lewitus, A.J.; Ringwood, A.H.; Hoguet, J.; Staton, T. Sublethal cellular effects of short-term raphidophyte and brevetoxin exposures on the eastern oyster Crassostrea virginica. Mar. Ecol. Prog. Ser. 2006, 312, 141–147. [Google Scholar] [CrossRef]
  129. de Boer, M.K.; Boeree, C.; Sjollema, S.B.; de Vries, T.; Rijnsdorp, A.D.; Buma, A.G.J. The toxic effect of the marine raphidophyte Fibrocapsa japonica on larvae of the common flatfish sole (Solea solea). Harmful Algae 2012, 17, 92–101. [Google Scholar] [CrossRef]
  130. Guiry, M.D.; Guiry, M.D.; Guiry, G.M. AlgaeBase; World-Wide Electronic Publication, National University of Ireland: Galway, Ireland, 2021; Available online: http://www.algaebase.org (accessed on 28 April 2021).
  131. John, U.; Litaker, R.W.; Montresor, M.; Murray, S.; Brosnahan, M.L.; Anderson, D.M. Formal revision of the Alexandrium tamarense species complex (Dinophyceae) taxonomy: The introduction of five species with emphasis on molecular-based (rDNA) classification. Protist 2014, 165, 779–804. [Google Scholar] [CrossRef] [PubMed] [Green Version]
  132. Ogata, T.; Kodama, M. Ichthyotoxicity found in cultured media of Protogonyaulax spp. Mar. Biol. 1986, 92, 31–34. [Google Scholar] [CrossRef]
  133. Katsuo, D.; Yamaguchi, K.; Matsuyama, Y.; Oda, T. A new simple screening method for the detection of cytotoxic substances produced by harmful red tide phytoplankton. Harmful Algae 2007, 6, 790–798. [Google Scholar] [CrossRef]
  134. Shumway, S.E.; Cucci, T.L.; Gainey, L.; Yentsch, C.M. A preliminary study of the behavioral and physiological effects of Gonyaulax tamarensis on bivalve molluscs. In Toxic Dinoflagellates; Anderson, D.M., White, A.W., Baden, D.G., Eds.; Elsevier: New York, NY, USA, 1985; pp. 389–394. [Google Scholar]
  135. MacKenzie, L.; (Cawthron Institute, Nelson, New Zealand). Personal communication, 2022.
  136. Chang, F.H.; Mackenzie, L.; Till, D.; Hannah, D.; Rhodes, L. The first toxic shellfish outbreaks and the associated phytoplankton blooms in early 1993 in New Zealand. In Harmful Marine Algal Bloom; Lassus, P., Arzul, G., Gentien, P., Marcaillou, C., Eds.; Technique et Documentation, Lavoisier Publishing: Paris, France, 1995; pp. 145–150. [Google Scholar]
  137. Chang, F.H.; Anderson, D.M.; Kulis, D.M.; Till, D.G. Toxin production of Alexandrium minutum (Dinophyceae) from the bay of Plenty, New Zealand. Toxicon 1997, 35, 393–409. [Google Scholar] [CrossRef]
  138. MacKenzie, L.; Rhodes, L.L.; Till, D.; Chang, F.H.; Kaspar, H.; Haywood, A.; Kapa, J.; Walker, B. A Gymnodinium sp. bloom and the contamination of shellfish with lipid soluble toxins in New Zealand, January–April 1993. In Harmful Marine Algal Blooms; Lassus, P., Arzul, G., Gentien, P., Marcaillou, C., Eds.; Technique et Documentation, Lavoisier Publishing: Paris, France, 1995; pp. 795–800. [Google Scholar]
  139. MacKenzie, L.; Haywood, A.; Adamson, J.; Truman, P.; Till, D.; Satake, M.; Yasumoto, T. Gymnodimine contamination of shellfish in New Zealand 1994. In Proceedings of the Seventh International Conference on Toxic Phytoplankton, Sendai, Japan, 11–16 July 1994. [Google Scholar]
  140. Lush, G.J.; Negri, A.; Hallegraeff, G.M. Exotoxins produced by the toxic dinoflagellate Alexandrium minutum: Characterisation by radioreceptor and neuroblastoma assays during the growth cycle. In Proceedings of the 9th International Conference-Harmful Algal Blooms 2000, Hobart, Australia, 7–11 February 2000; Hallegraeff, G.M., Blackburn, S.I., Bolch, C.J., Lewis, R.J., Eds.; Intergovernmental Oceanographic Commission of UNESCO: Paris, France, 2001; pp. 268–271. [Google Scholar]
  141. MacKenzie, L.; Beauchamp, T. Gymnodinium catenatum in New Zealand: A new problem for public health and the shellfish industry. In Cawthron Report; Cawthron Institute: Nelson, New Zealand, 2001; 10p. [Google Scholar]
  142. Haywood, A.J.; Steidinger, K.; Truby, E.W.; Bergquist, P.; Bergquist, P.L.; Adamson, J.; MacKenzie, L. Comparative morphology and molecular phylogenetic analysis of three new species of the genus Karenia (Dinophyceae) from New Zealand. J. Phycol. 2004, 40, 165–179. [Google Scholar] [CrossRef]
  143. Rhodes, L.L.; Haywood, A.J.; Ballantine, W.J.; MacKenzie, A.L. Algal blooms and climate anomalies in north-east New Zealand, August-December 1992. N. Z. J. Mar. Freshw. Res. 1993, 27, 419–430. [Google Scholar] [CrossRef]
  144. Ericson, K. Making Space for Red Tide: Discolored Water and the Early Twentieth Century Bayscape of Japanese Pearl Cultivation. J. Hist. Biol. 2017, 50, 393–423. [Google Scholar] [CrossRef]
  145. Okaichi, T. Red Tides; Terra Scientific Publishing Company: Tokyo, Japan, 2004; p. 439. [Google Scholar]
  146. Todd, K. Report for NZ Marine Biotoxin Technical Committee; Cawthron Institute: Nelson, New Zealand, 2002; 30p. [Google Scholar]
  147. Jasperse, J.A. Marine toxins and New Zealand shellfish. In Proceedings of the Workshop on Research Issues, Wellington, New Zealand, 10–11 June 1993; The Royal Society of New Zealand, Miscellaneous Series 24. 1993. [Google Scholar]
  148. Iwataki, M.; Lum, W.M.; Kuwata, K.; Takahashi, K.; Arima, D.; Kuribayashi, T.; Kosaka, Y.; Hasegawa, N.; Watanabe, T.; Shikata, T.; et al. Morphological variation and phylogeny of Karenia selliformis (Gymnodiniales, Dinophyceae) in an intensive cold-water algal bloom in eastern Hokkaido, Japan. Harmful Algae 2022, 114, 102204. [Google Scholar] [CrossRef]
  149. Mountfort, D.; Beuzenberg, V.; MacKenzie, L.; Rhodes, L. Enhancement of growth and gymnodimine production by the marine dinoflagellate, Karenia Selliformis. Harmful Algae 2006, 5, 658–664. [Google Scholar] [CrossRef]
  150. Seki, T.; Satake, M.; Mackenzie, L.; Kaspar, H.F.; Yasumoto, T. Gymnodimine, a new marine toxin of unprecedented structure isolated from New Zealand oysters and the dinoflagellate, Gymnodinium sp. Tetrahedron Lett. 1995, 36, 7093–7096. [Google Scholar] [CrossRef]
  151. MacKenzie, L.; Beuzenberg, V.; Holland, P.; McNabb, P.; Suzuki, T.; Selwood, A. Pectenotoxin and okadaic acid-based toxin profiles in Dinophysis acuta and Dinophysis acuminata from New Zealand. Harmful Algae 2005, 4, 75–85. [Google Scholar] [CrossRef]
  152. Mackenzie, L. A long-term time series of Dinophysis acuminata blooms and associated shellfish toxin contamination in Port Underwood, Marlborough Sounds, New Zealand. Toxins 2019, 11, 74. [Google Scholar] [CrossRef] [Green Version]
  153. Basti, L.; Uchida, H.; Kanamori, M.; Matsushima, R.; Suzuki, T.; Nagai, S. Mortality and pathology of Japanese scallop, Patinopecten (Mizuhopecten) yessoensis, and noble scallop, Mimachlamys nobilis, fed monoclonal culture of PTX-producer, Dinophysis caudata. In Marine and Freshwater Harmful Algae, Proceedings of the 16th International Conference on Harmful Algae, Wellington, New Zealand, 27–30 October 2014; MacKenzie, A.L., Ed.; Cawthron Institute, Nelson, New Zealand and International Society for the Study of Harmful Algae: Wellington, New Zealand, 2014; pp. 105–108. [Google Scholar]
  154. Rountos, K.J.; Kim, J.J.; Hattenrath-Lehmann, T.K.; Gobler, C.J. Effects of the harmful algae, Alexandrium catenella and Dinophysis acuminata, on the survival, growth, and swimming activity of early life stages of forage fish. Mar. Environ. Res. 2019, 148, 46–56. [Google Scholar] [CrossRef]
  155. Rhodes, L.; Jiang, W.; Knight, B.; Adamson, J.; Smith, K.; Langi, V.; Edgar, M. The genus Pseudo-nitzschia (Bacillariophyceae) in New Zealand: Analysis of the last decade’s monitoring data. N. Z. J. Mar. Freshw. Res. 2013, 47, 490–503. [Google Scholar] [CrossRef] [Green Version]
  156. Nishimura, T.; Murray, J.S.; Boundy, M.J.; Balci, M.; Bowers, H.A.; Smith, K.F.; Harwood, D.T.; Rhodes, L.L. Update of the Planktonic Diatom Genus Pseudo-nitzschia in Aotearoa New Zealand Coastal Waters: Genetic Diversity and Toxin Production. Toxins 2021, 13, 637. [Google Scholar] [CrossRef]
  157. Holland, P.T.; McNabb, P.; Rhodes, L.L.; Selwood, A.I.; Neil, T. Amnesic shellfish poisoning toxins in New Zealand shellfish: Detection of an unusual domoic acid isomer using a newly validated LC–MS/MS method. In Molluscan Shellfish Safety; Xanta de Galicia & IOC of UNESCO: Santiago de Compostela, Spain, 2003; pp. 29–42. [Google Scholar]
  158. Rhodes, L.L.; Holland, P.T.; Adamson, J.E.; McNabb, P.; Selwood, A.I. Production of a new isomer of domoic acid by New Zealand isolates of the diatom Pseudo-nitzschia australis. In Molluscan Shellfish Safety; Xanta de Galicia & IOC of UNESCO: Santiago de Compostela, Spain, 2003; pp. 43–48. [Google Scholar]
  159. Liefer, J.D.; Robertson, A.; MacIntyre, H.L.; Smith, W.L.; Dorsey, C.P. Characterization of a toxic Pseudo-nitzschia spp. bloom in the Northern Gulf of Mexico associated with domoic acid accumulation in fish. Harmful Algae 2013, 26, 20–32. [Google Scholar] [CrossRef]
  160. Scholin, C.A.; Gulland, F.; Doucette, G.J.; Benson, S.; Busman, M.; Chavez, F.P.; Cordaro, J.; DeLong, R.; De Vogelaere, A.; Harvey, J.; et al. Mortality of sea lions along the central California coast linked to a toxic diatom bloom. Nature 2000, 403, 80–84. [Google Scholar] [CrossRef]
  161. Lefebvre, K.A.; Frame, E.R.; Kendrick, P.S. Domoic acid and fish behavior: A review. Harmful Algae 2012, 13, 126–130. [Google Scholar] [CrossRef]
  162. Rhodes, L.L.; Mackenzie, A.L.; Kaspar, H.F.; Todd, K.E. Harmful algae and mariculture in New Zealand. ICES J. Mar. Sci. 2001, 58, 398–403. [Google Scholar] [CrossRef] [Green Version]
  163. Cho, E.S.; Rhodes, L.L.; Kim, H.K. The comparison of two strains of Fibrocapsa japonica (Raphidophyceae) in New Zealand and Japan. J. Fish. Sci. Technol. 1999, 2, 58–65. [Google Scholar]
  164. Nguyen-Ngoc, L.; Doan-Nhu, H.; Larsen, J.; Phan-Tan, L.; Nguyen, X.V.; Lundholm, N.; Van Chu, T.; Huynh-Thi, D.N. Morphological and genetic analyses of Ostreopsis (Dinophyceae, Gonyaulacales, Ostreopsidaceae) species from Vietnamese waters with a re-description of the type species, O. siamensis. J. Phycol. 2021, 57, 1059–1083. [Google Scholar] [CrossRef] [PubMed]
  165. Rhodes, L.L.; Towers, N.; Briggs, L.; Munday, R.; Adamson, J. Uptake of palytoxin-like compounds by feeding shellfish with Ostreopsis siamensis (Dinophyceae). N. Z. J. Mar. Freshw. Res. 2002, 36, 631–636. [Google Scholar] [CrossRef]
  166. Rhodes, L. World-wide occurrence of the toxic dinoflagellate genus Ostreopsis Schmidt. Toxicon 2011, 57, 400–407. [Google Scholar] [CrossRef]
  167. Rhodes, L.; (Cawthron Institute, Nelson, New Zealand). Personal communication, 2022.
  168. Shilo, M. The toxic principles of Prymnesium parvum. In The Water Environment, Algal Toxins and Health; Carmichael, W.W., Ed.; Plenum Press: London, UK, 1981; pp. 37–47. [Google Scholar]
  169. Wagstaff, B.A.; Hems, E.S.; Rejzek, M.; Pratscher, J.; Brooks, E.; Kuhaudomlarp, S.; O’Neill, E.C.; Donaldson, M.I.; Lane, S.; Currie, J.; et al. Insights into toxic Prymnesium parvum blooms: The role of sugars and algal viruses. Biochem. Soc. Trans. 2018, 46, 413–421. [Google Scholar] [CrossRef] [Green Version]
  170. Jones, J.B.; Rhodes, L.L. Suffocation of pilchards (Sardinops sagax) by a green microalgal bloom, Wellington Harbour, New Zealand, December 1993, N. Z. J. Mar. Freshw. Res. 1994, 28, 379–384. [Google Scholar] [CrossRef]
  171. Albright, L.J.; Yang, C.Z.; Johnson, S. Sub-lethal concentrations of the harmful diatoms, Chaetoceros concavicornis and C. convolutus, increase mortality rates of penned Pacific salmon. Aquaculture 1993, 117, 215–225. [Google Scholar] [CrossRef]
  172. López-Cortés, D.J.; Núñez-Vázquez, E.J.; Band-Schmidt, C.J.; Gárate-Lizárraga, I.; Hernández-Sandoval, F.E.; Bustillos-Guzmán, J.J. Mass fish die-off during a diatom bloom in the Bahía de La Paz, Gulf of California. Hidrobiológica 2015, 25, 39–48. [Google Scholar]
  173. Lassudrie, M.; Soudant, P.; Richard, G.; Henry, N.; Medhioub, W.; da Silva, P.M.; Donval, A.; Bunel, M.; LeGoïc, N.; Lambert, C.; et al. Physiological responses of Manila clams Venerupis (=Ruditapes) philippinarum with varying parasite Perkinsus olseni burden to toxic algal Alexandrium ostenfeldii exposure. Aquat. Toxicol. 2014, 154, 27–38. [Google Scholar] [CrossRef] [PubMed] [Green Version]
  174. Medhioub, W.; Lassus, P.; Truquet, P.; Bardouil, M.; Amzil, Z.; Sechet, V.; Sibat, M.; Soudant, P. Spirolide uptake and detoxification by Crassostrea gigas exposed to the toxic dinoflagellate Alexandrium ostenfeldii. Aquaculture 2012, 358, 108–115. [Google Scholar] [CrossRef] [Green Version]
  175. Kim, C.H.; Cho, H.J.; Shin, J.B.; Moon, C.H.; Matsouka, K. Regeneration from hyaline cysts of Cochlodinium polykrikoides (Gymnodiniales, Dinophyceae), a red tide organism along the Korean coast. Phycologia 2002, 41, 667–669. [Google Scholar] [CrossRef]
  176. Griffith, A.W.; Shumway, S.E.; Gobler, C.J. Differential mortality of North Atlantic bivalve molluscs during harmful algal blooms caused by the dinoflagellate, Cochlodinium (aka Margalefidinium) polykrikoides. Estuaries Coasts 2019, 42, 190–203. [Google Scholar] [CrossRef] [Green Version]
  177. Tang, Y.Z.; Gobler, C.J. Cochlodinium polykrikoides blooms and clonal isolates from the northwest Atlantic coast cause rapid mortality in larvae of multiple bivalve species. Mar. Biol. 2009, 156, 2601–2611. [Google Scholar] [CrossRef]
  178. Matsuyama, Y. Harmful Effect of Dinoflagellate Heterocapsa circularisquama on Shellfish Aquaculture in Japan. Jpn. Agric. Res. Q. 1999, 33, 283–293. [Google Scholar]
  179. Matsuyama, Y. Physiological and ecological studies on harmful dinoflagellate Heterocapsa circularisquama: II. Clarification on toxicity of H. circularisquama and its mechanisms causing shellfish kills. Bull. Fish. Res. Agency. 2003, 9, 13–117. [Google Scholar]
  180. Basti, L.; Go, J.; Higuchi, K.; Nagai, K.; Segawa, S. Effects of the toxic dinoflagellate Heterocapsa circularisquama on larvae of the pearl oyster Pinctada fucata martensii (Dunker, 1873). J. Shellfish. Res. 2011, 30, 177–186. [Google Scholar] [CrossRef]
  181. Balci, M.; Nishimura, T.; Smith, K.; Rhodes, L.; Murray, S.; MacKenzie, L. First report of Heterocapsa minima from Aotearoa/New Zealand. Harmful Algae News 2020, 64, 8–9. [Google Scholar]
  182. Adolf, J.E.; Bachvaroff, T.R.; Deeds, J.R.; Place, A.R. Ichthyotoxic Karlodinium veneficum (Ballantine) J Larsen in the Upper Swan River Estuary (Western Australia): Ecological conditions leading to a fish kill. Harmful Algae 2015, 48, 83–93. [Google Scholar] [CrossRef] [Green Version]
  183. Deeds, J.R.; Terlizzi, D.E.; Adolf, J.E.; Stoecker, D.K.; Place, A.R. Toxic activity from cultures of Karlodinium micrum (=Gyrodinium galatheanum) (Dinophyceae)—A dinoflagellate associated with fish mortalities in an estuarine aquaculture facility. Harmful Algae 2002, 1, 169–189. [Google Scholar] [CrossRef]
  184. Goshorn, D.; Deeds, J.R.; Tango, P.; Poukish, C.; Place, A.R.; McGinty, M.; Butler, W.; Luckett, C.; Magnien, R. Occurrence of Karlodinium micrum and its association with fish kills in Maryland estuaries. In Harmful Algae 2002, Florida Fish and Wildlife Conservation Commission; Steidinger, K.A., Landsberg, J.H., Tomas, C.R., Vargo, G.A., Eds.; Florida Institute of Oceanography, and Intergovernmental Oceanographic Commission of UNESCO: St. Petersburg, FL, USA; pp. 361–363.
  185. Brownlee, E.F.; Sellner, S.G.; Sellner, K.G.; Nonogaki, H.; Adolf, J.E.; Bachvaroff, T.R.; Place, A.R. Responses of Crassostrea virginica (Gmelin) and C. ariakensis (Fujita) to bloom-forming phytoplankton including ichthyotoxic Karlodinium veneficum (Ballantine). J. Shellfish Res. 2008, 27, 581–591. [Google Scholar] [CrossRef]
  186. Glibert, P.M.; Alexander, J.; Merritt, D.W.; North, E.W.; Stoecker, D.K. Harmful algae pose additional challenges for oyster restoration: Impacts of the harmful algae Karlodinium veneficum and Prorocentrum minimum on early life stages of the oysters Crassostrea virginica and Crassostrea ariakensis. J. Shellfish Res. 2007, 26, 919–925. [Google Scholar] [CrossRef]
  187. Pease, S.K.; Reece, K.S.; O’Brien, J.; Hobbs, P.L.; Smith, J.L. Oyster hatchery breakthrough of two HABs and potential effects on larval eastern oysters (Crassostrea virginica). Harmful Algae 2021, 101, 101965. [Google Scholar] [CrossRef] [PubMed]
  188. Place, A.R.; Brownlee, E.F.; Sellner, S.G.; Sellner, K.G.; Nonogaki, H.; Adolf, J.A.; Bachvaroff, T.R. Bivalve responses to ichthyotoxic Karlodinium veneficum (Ballantine). In Proceedings of the 12th International Conference on Harmful Algae, Copenhagen, Denmark, 4–8 September 2006; pp. 5–8. [Google Scholar]
  189. Stoecker, D.; Adolf, J.E.; Place, A.R.; Glibert, P.; Meritt, D. Effects of the dinoflagellates Karlodinium veneficum and Prorocentrum minimum on early life history stages of the eastern oyster (Crassostrea virginica). Mar. Biol. 2008, 154, 81–90. [Google Scholar] [CrossRef]
  190. Galimany, E.; Place, A.R.; Ramón, M.; Jutson, M.; Pipe, R.K. The effects of feeding Karlodinium veneficum (PLY# 103; Gymnodinium veneficum Ballantine) to the blue mussel Mytilus edulis. Harmful Algae 2008, 7, 91–98. [Google Scholar]
  191. Burkholder, J.M.; Glasgow, H.B., Jr.; Deamer-Melia, N. Overview and present status of the toxic Pfiesteria complex (Dinophyceae). Phycologia 2001, 40, 186–214. [Google Scholar] [CrossRef]
  192. Kane, A.S.; Oldach, D.; Reimschuessel, R. Fish lesions in the Chesapeake Bay: Pfiesteria-like dinoflagellates and other etiologies. Md. Med. J. 1998, 47, 106–112. [Google Scholar]
  193. Springer, J.J.; Shumway, S.E.; Burkholder, J.M.; Glasgow, H.B. Interactions between the toxic estuarine dinoflagellate Pfiesteria piscicida and two species of bivalve mollusc. Mar. Ecol. Prog. Ser. 2002, 245, 1–10. [Google Scholar] [CrossRef] [Green Version]
  194. Park, T.G.; Bolch, C.J.S.; Hallegraeff, G.M. Larval Crassostrea bivalve and Artemia brine shrimp bioassays to assess toxicity and micropredation by the heterotrophic dinoflagellates Cryptoperidiniopsis brodyi and Pfiesteria piscicida from Australian waters. J. Plankton Res. 2007, 29, 791–801. [Google Scholar] [CrossRef]
  195. Rhodes, L.L.; Burkholder, J.M.; Glasgow, H.B.; Rublee, P.A.; Allen, C.; Adamson, J.E. Pfiesteria shumwayae (Pfiesteriaceae) in New Zealand. N. Z. J. Mar. Freshw. Res. 2002, 36, 621–630. [Google Scholar] [CrossRef]
  196. Shumway, S.E.; Burkholder, J.M.; Springer, J. Effects of the estuarine dinoflagellate Pfiesteria shumwayae (Dinophyceae) on survival and grazing activity of several shellfish species. Harmful Algae 2006, 5, 442–458. [Google Scholar] [CrossRef]
  197. Pearce, I.; Handlinger, J.H.; Hallegraeff, G.M. Histopathology in Pacific oyster (Crassostrea gigas) spat caused by the dinoflagellate Prorocentrum rhathymum. Harmful Algae 2005, 4, 61–74. [Google Scholar] [CrossRef]
  198. Johnsen, G.; Dalløkken, R.; Eikrem, W.; Legrand, C.; Aure, J.; Skjoldal, H.R. Eco-physiology, bio-optics and toxicity of the ichthyotoxic Chrysochromulina leadbeateri (Prymnesiophyceae). J. Phycol. 1999, 35, 1465–1476. [Google Scholar] [CrossRef]
  199. Okaichi, T. Red Tides in the Seto Inland Sea. In Sustainable Development in the Seto Inland Sea, Japan from the Viewpoint of Fisheries; Okaichi, T., Yanagi, T., Eds.; TERRAPUB: Tokyo, Japan, 1997; pp. 251–304. [Google Scholar]
  200. Hallegraeff, G.M.; Munday, B.L.; Baden, D.G.; Whitney, P.L. Chatonnella marina Raphidophyte Bloom Associated with Mortality of Cultured Bluefin Tuna (Thunnus maccoyii) in South Australia; Reguera, B., Blanco, J., Ferandz, M.L., Wyatt, T., Eds.; Xunta de Galacia and IOC: Santiago de Compostela, Spain, 1998; pp. 93–96. [Google Scholar]
  201. Marshall, J.A.; Hallegraeff, G.M. Comparative ecophysiology of the harmful alga Chattonella marina (Raphidophyceae) from South Australian and Japanese waters. J. Plankton Res. 1999, 21, 1809–1822. [Google Scholar] [CrossRef] [Green Version]
  202. Rhodes, L.; Smith, K.; MacKenzie, L.; Moisan, C. Checklist of the planktonic marine dinoflagellates of New Zealand. N. Z. J. Mar. Freshw. Res. 2019, 54, 86–101. [Google Scholar] [CrossRef]
  203. Sheng, J.; Malkiel, E.; Katz, J.; Adolf, J.E.; Place, A.R. A dinoflagellate exploits toxins to immobilise prey prior to ingestion. Proc. Natl. Acad. Sci. USA 2010, 107, 2082–2087. [Google Scholar] [CrossRef] [Green Version]
  204. Yang, Z.B.; Hodgkiss, I.J. Hong Kong’s worst “red tide”—Causative factors reflected in a phytoplankton study at Port Shelter station 1998. Harmful Algae 2004, 3, 149–161. [Google Scholar] [CrossRef]
  205. de Salas, M.F.; Laza-Martínez, A.; Hallegraeff, G.M. Five new species of Karlodinium and one new Takayama (Kareniaceae, Dinophyceae) from open Southern Ocean waters. J. Phycol. 2008, 44, 241–257. [Google Scholar] [CrossRef]
  206. Rhodes, L.; Smith, K. A checklist of the benthic and epiphytic marine dinoflagellates of New Zealand, including Rangitāhua/Kermadec Islands. N. Z. J. Mar. Freshw. Res. 2018, 53, 258–277. [Google Scholar] [CrossRef]
  207. Sutton, P.J.H.; Bowen, M. Ocean temperature change around New Zealand over the last 36 years. N. Z. J. Mar. Freshw. Res. 2019, 53, 305–326. [Google Scholar] [CrossRef]
  208. Salinger, M.J.; Renwick, J.; Behrens, E.; Mullan, A.B.; Diamond, H.J.; Sirguey, P.; Smith, R.; Trought, M.C.T.; Alexander, V.L.; Cullen, N.J.; et al. The unprecedented coupled ocean-atmosphere summer heatwave in the New Zealand region 2017/18: Drivers, mechanisms and impacts. Environ. Res. Lett. 2019, 14, 044023. [Google Scholar] [CrossRef]
  209. Burkholder, J.M.; Moeller, P.D.R.; Gordon, A.S.; Lewitus, A.J.; Ramsdell, J.S.; Glasgow, H.B.; Marshall, H.G.; Morton, S.L. Status of Pfiesteria science, including tests of Pfiesteria shumwayae strain CCMP2089 for ichthyotoxicity and toxin. In Harmful Algae 2002—Proceedings of the Xth International Conference on Harmful Algae; Steidinger, K.A., Landsberg, J.H., Tomas, C.R., Vargo, G.A., Eds.; Florida Fish and Wildlife Conservation Commission, Florida Inst. Oceanography, and IOC, UNESCO: St. Petersburg, FL, USA, 2004; pp. 50–52. [Google Scholar]
  210. Rhodes, L.L.; Adamson, J.E.; Rublee, P.; Schaeffer, E. Geographic distribution of Pfiesteria piscicida and P. shumwayae (Pfiesteriaceae) in Tasman Bay and Canterbury, New Zealand (2002–2003). N. Z. J. Mar. Freshw. Res. 2006, 40, 211–220. [Google Scholar] [CrossRef] [Green Version]
  211. Rublee, P.; Allen, C.; Schaefer, E.; Rhodes, L.; Adamson, J.; Lapworth, C.; Burkholder, J.; Glasgow, H. Global distribution of toxic Pfiesteria complex species detected by PCR assay. In Harmful Algae 2002—Proceedings of the Xth International Conference on Harmful Algae, St. Pete Beach, FL, USA, 21–25 October 2002; Steidinger, K.A., Landsberg, J.H., Tomas, C.R., Vargo, G.A., Eds.; Florida Fish and Wildlife Conservation Commission, Florida Institute of Oceanography, and IOC of UNESCO: St. Petersburg, FL, USA, 2004; pp. 320–322. [Google Scholar]
  212. Dorantes-Aranda, J.J.; Seger, A.; Mardones, J.I.; Nichols, P.D.; Hallegraeff, G.M. Progress in understanding algal bloom-mediated fish kills: The role of superoxide radicals, phycotoxins and fatty acids. PLoS ONE 2015, 10, 0133549. [Google Scholar] [CrossRef]
  213. Ahumada-Fierro, N.; Garcia-Mendoza, E.; Sandoval-Gil, J.M.; Band-Schimdt, C. Photosynthesis and photoprotection characteristics related ROS production in three Chattonella (Raphidophyceae) species. J. Phycol. 2021, 57, 941–954. [Google Scholar] [CrossRef] [PubMed]
  214. McNabb, P.; Rhodes, L.; Adamson, J.; Holland, P. Brevetoxin—An elusive toxin in New Zealand waters. Afr. J. Mar. Sci. 2006, 28, 375–377. [Google Scholar] [CrossRef]
  215. Smith, K.F.; Kohli, G.S.; Murray, S.A.; Rhodes, L.L. Assessment of the metabarcoding approach for community analysis of benthic-epiphytic dinoflagellates using mock communities. N. Z. J. Mar. Freshw. Res. 2017, 51, 555–576. [Google Scholar] [CrossRef]
  216. Rhodes, L.L.; Kelly, C.; Hall, J.A. Comparison of growth characteristics of New Zealand isolates of the prymnesiophytes Chrysochromulina quadrikonta and C. camellawith those of the ichthyotoxic species C. polylepis. J. Plankton Res. 1994, 16, 69–82. [Google Scholar]
  217. Broekhuizen, N.; Plew, D.R.; Pinkerton, M.H.; Gall, M.G. Sea temperature rise over the period 2002–2020 in Pelorus Sound, New Zealand–with possible implications for the aquaculture industry. N. Z. J. Mar. Freshw. Res. 2021, 55, 46–64. [Google Scholar] [CrossRef]
  218. Farrell, H.; Seebacher, F.; O’Connor, W.; Zammit, A.; Harwood, D.T.; Murray, S. Warm temperature acclimation impacts metabolism of paralytic shellfish toxins from Alexandrium minutum in commercial oysters. Glob. Chang. Biol. 2015, 21, 3402–3413. [Google Scholar] [CrossRef]
  219. Hawkins, A.J.S. Effects of temperature change on ectotherm metabolism and evolution: Metabolic and physiological interrelations underlying the superiority of multi-locus heterozygotes in heterogeneous environments. J. Therm. Biol. 1995, 20, 23–33. [Google Scholar] [CrossRef]
  220. Peck, L.S.; Webb, K.E.; Bailey, D.M. Extreme sensitivity of biological function to temperature in Antarctic marine species. Funct. Ecol. 2004, 18, 625–630. [Google Scholar] [CrossRef] [Green Version]
  221. Hégaret, H.; Smolowitz, R.M.; Sunila, I.; Shumway, S.E.; Alix, J.; Dixon, M.; Wikfors, G.H. Combined effects of a parasite, QPX, and the harmful-alga, Prorocentrum minimum on northern quahogs, Mercenaria mercenaria. Mar. Environ. Res. 2010, 69, 337–344. [Google Scholar] [CrossRef] [PubMed] [Green Version]
  222. Lassudrie, M.; Soudant, P.; Nicolas, J.L.; Fabioux, C.; Lambert, C.; Miner, P.; Le Grand, J.; Petton, B.; Hegaret, H. Interaction between toxic dinoflagellate Alexandrium catenella exposure and disease associated with herpesvirus OsHV-1 μVar in Pacific oyster spat Crassostrea gigas. Harmful Algae 2015, 45, 53–61. [Google Scholar] [CrossRef] [Green Version]
  223. Griffith, A.W.; Gobler, C.J. Harmful algal blooms: A climate change co-stressor in marine and freshwater ecosystems. Harmful Algae 2020, 91, 101590. [Google Scholar] [CrossRef]
  224. Karlson, B.; Andersen, P.; Arneborg, L.; Cembella, A.; Eikrem, W.; John, U.; West, J.J.; Klemm, K.; Kobos, J.; Lehtinen, S.; et al. Harmful algal blooms and their effects in coastal seas of Northern Europe. Harmful Algae 2021, 102, 101989. [Google Scholar] [CrossRef]
  225. Ford, S.E.; Bricelj, V.M.; Lambert, C.; Paillard, C. Deleterious effects of a non PST bioactive compound (s) from Alexandrium tamarense on bivalve hemocytes. Mar. Biol. 2008, 154, 241–253. [Google Scholar] [CrossRef] [Green Version]
  226. Tillmann, U.; Alpermann, T.L.; da Purificação, R.C.; Krock, B.; Cembella, A. Intra-population clonal variability in allelochemical potency of the toxigenic dinoflagellate Alexandrium tamarense. Harmful Algae 2009, 8, 759–769. [Google Scholar] [CrossRef]
  227. Beesoo, R.L.; Auzoux Bordenave, S.; Réveillon, D.; Hervé, D.; Hogeveen, K.; Fessard, V.; Lassudrie, M. Ichthyotoxicity and underlying mechanisms of French Karlodinium veneficum strains using in vitro fish gill cell-based bioassays. In Proceedings of the ICHA 19th International Conference on Harmful Algae, La Paz, Mexico, 10–15 October 2021; p. 162. [Google Scholar]
  228. Rhodes, L.L.; Smith, K.F.; Murray, J.S.; Nishimura, T.; Finch, S.C. Ciguatera fish poisoning: The risk from an Aotearoa/New Zealand perspective. Toxins 2020, 12, 50. [Google Scholar] [CrossRef] [Green Version]
  229. Condie, S.A.; Oliver, E.C.; Hallegraeff, G.M. Environmental drivers of unprecedented Alexandrium catenella dinoflagellate blooms off eastern Tasmania, 2012–2018. Harmful Algae 2019, 87, 101628. [Google Scholar] [CrossRef]
  230. Álvarez, G.; Díaz, P.A.; Godoy, M.; Araya, M.; Ganuza, I.; Pino, R.; Álvarez, F.; Rengal, J.; Hernández, C.; Uribe, E.; et al. Paralytic shellfish toxins in surf clams Mesodesma donacium during a large bloom of Alexandrium catenella dinoflagellates associated to an intense shellfish mass mortality. Toxins 2019, 11, 188. [Google Scholar] [CrossRef] [PubMed] [Green Version]
  231. Bricelj, V.M.; Connell, L.; Konoki, K.; MacQuarrie, S.P.; Scheuer, T.; Catterall, W.A.; Trainer, V.L. Sodium channel mutation leading to saxitoxin resistance in clams increases risk of PSP. Nature 2005, 434, 763–767. [Google Scholar] [CrossRef] [PubMed]
  232. Starr, M.; Lair, S.; Michaud, S.; Scarratt, M.; Quilliam, M.; Lefaivre, D.; Robert, M.; Wotherspoon, A.; Michaud, R.; Ménard, N.; et al. Multispecies mass mortality of marine fauna linked to a toxic dinoflagellate bloom. PLoS ONE 2017, 12, e01s76299. [Google Scholar] [CrossRef] [PubMed]
  233. MacKenzie, A.L.; Webber, S.; Watts, A.M.; Tonks, A. Historical deposits of Alexandrium catenella resting cysts in the sediments of Queen Charlotte Sound, New Zealand. N. Z. J. Mar. Fresh. Res. 2016, 50, 195–208. [Google Scholar] [CrossRef]
  234. Sellner, K.G.; Rensel, J.E. Prevention, control, and mitigation of harmful algal bloom impacts on fish, shellfish, and human consumers. In Harmful Algal Blooms: A compendium Desk Reference; Shumway, S.E., Burkholder, J.A.M., Morton, S.L., Eds.; John Wiley & Sons Ltd.: Hoboken, NJ, USA, 2018; pp. 435–492. [Google Scholar]
  235. Cruz, R.C.; Reis Costa, P.; Vinga, S.; Krippahl, L.; Lopes, M.B. A Review of recent machine learning advances for forecasting harmful algal blooms and shellfish contamination. J. Mar. Sci. Eng. 2021, 9, 283. [Google Scholar] [CrossRef]
  236. Mayer, L. Floating Closed Containment. Aquaculture North America. 2019. Available online: https://www.aquaculturenorthamerica.com/floating-closed-containment-2362/ (accessed on 13 April 2022).
  237. Kozich, J.J.; Westcott, S.L.; Baxter, N.T.; Highlander, S.K.; Schloss, P.D. Development of a dual-index sequencing strategy and curation pipeline for analyzing amplicon sequence data on the MiSeq Illumina sequencing platform. Appl. Environ. Microbiol. 2013, 79, 5112–5120. [Google Scholar] [CrossRef] [Green Version]
  238. Martin, M. Cutadapt removes adapter sequences from high-throughput sequencing reads. EMBnet. J. 2011, 17, 10–12. [Google Scholar] [CrossRef]
  239. Callahan, B.J.; McMurdie, P.J.; Rosen, M.J.; Han, A.W.; Johnson, A.J.A.; Holmes, S.P. DADA2: High-resolution sample inference from Illumina amplicon data. Nat. Methods 2016, 13, 581. [Google Scholar] [CrossRef] [Green Version]
  240. Guillou, L.; Bachar, D.; Audic, S.; Bass, D.; Berney, C.; Bittner, L.; Boutte, C.; Burgaud, G.; de Vargas, C.; Decelle, J.; et al. The Protist Ribosomal Reference database (PR2): A catalog of unicellular eukaryote small sub-unit rRNA sequences with curated taxonomy. Nucleic Acids Res. 2012, 41, 597–604. [Google Scholar] [CrossRef] [Green Version]
  241. Smith, K.F.; Biessy, L.; Argyle, P.A.; Trnski, T.; Halafihi, T.; Rhodes, L.L. Molecular identification of Gambierdiscus and Fukuyoa (Dinophyceae) from environmental samples. Mar. Drugs 2017, 15, 243. [Google Scholar] [CrossRef] [Green Version]
  242. Bittner, L.; Gobet, A.; Audic, S.; Romac, S.; Egge, E.S.; Santini, S.; Ogata, H.; Probert, I.; Edvardsen, B.; De Vargas, C. Diversity patterns of uncultured Haptophytes unravelled by pyrosequencing in Naples Bay. Mol. Ecol. 2013, 22, 87–101. [Google Scholar] [CrossRef] [PubMed]
  243. Wang, Q.; Garrity, G.M.; Tiedje, J.M.; Cole, J.R. Naive Bayesian classifier for rapid assignment of rRNA sequences into the new bacterial taxonomy. Appl. Environ. Microbiol. 2007, 73, 5261–5267. [Google Scholar] [CrossRef] [PubMed] [Green Version]
  244. McMurdie, P.J.; Holmes, S. Phyloseq: An R package for reproducible interactive analysis and graphics of microbiome census data. PLoS ONE 2013, 8, e61217. [Google Scholar] [CrossRef] [PubMed] [Green Version]
  245. Wickham, H. ggplot2: Elegant Graphics for Data Analysis; Springer: Berlin, Germany, 2016. [Google Scholar]
  246. Zhan, A.; Hulák, M.; Sylvester, F.; Huang, X.; Adebayo, A.A.; Abbott, C.L.; Adamowicz, S.J.; Heath, D.D.; Cristescu, M.E.; MacIsaac, H.J.; et al. High sensitivity of 454 pyrosequencing for detection of rare species in aquatic communities. Methods Ecol. Evol. 2013, 4, 558–565. [Google Scholar]
  247. Egge, E.; Bittner, L.; Andersen, T.; Audic, S.; de Vargas, C.; Edvardsen, B. 454 pyrosequencing to describe microbial eukaryotic community composition, diversity and relative abundance: A test for marine haptophytes. PLoS ONE 2013, 8, e74371. [Google Scholar]
  248. Scholin, C.A.; Herzog, M.; Sogin, M.; Anderson, D.M. Identification of group-specific and strain-specific genetic-markers for globally distributed Alexandrium (Dinophyceae). II. Sequence analysis of a fragment of the LSU rRNA gene. J. Phycol. 1994, 30, 999–1011. [Google Scholar]
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Figure 1. Map showing New Zealand locations mentioned in the manuscript.
Figure 1. Map showing New Zealand locations mentioned in the manuscript.
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Figure 2. Known lethal (red arrows) and sublethal (orange arrow) effects of harmful algal species that have bloomed on fish and shellfish in New Zealand. Arrows indicate blooms that have impacted fish (e.g., Heterosigma akashiwo), shellfish (e.g., Alexandrium pacificum), or affected both fish and shellfish (e.g., Karenia brevisulcata). Image: Eden Cartwright, Bird Circus.com.
Figure 2. Known lethal (red arrows) and sublethal (orange arrow) effects of harmful algal species that have bloomed on fish and shellfish in New Zealand. Arrows indicate blooms that have impacted fish (e.g., Heterosigma akashiwo), shellfish (e.g., Alexandrium pacificum), or affected both fish and shellfish (e.g., Karenia brevisulcata). Image: Eden Cartwright, Bird Circus.com.
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Figure 3. The 2010 Pseudochattonella bloom, dominated by P. verruculosa, present in Queen Charlotte Sound, Marlborough sounds, New Zealand. Credit: Lincoln MacKenzie.
Figure 3. The 2010 Pseudochattonella bloom, dominated by P. verruculosa, present in Queen Charlotte Sound, Marlborough sounds, New Zealand. Credit: Lincoln MacKenzie.
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Figure 4. Cells of Pavlomulina (black arrows): swimming freely (top left) attached to trochophore larvae of C. gigas (right) and swelling (top right). Scale bar = 20 µm. Photo credit: Othmand Bojo.
Figure 4. Cells of Pavlomulina (black arrows): swimming freely (top left) attached to trochophore larvae of C. gigas (right) and swelling (top right). Scale bar = 20 µm. Photo credit: Othmand Bojo.
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Figure 5. Relative abundance of dominant diatom and other eukaryotic phytoplankton (excluding dinoflagellate and haptophytes) genera from each of the sampled geographic regions amplified using universal 18S ribosomal RNA primers. No raphidophytes or dictyochophytes were detected. X = Unclassified from the higher rank of taxonomic classification.
Figure 5. Relative abundance of dominant diatom and other eukaryotic phytoplankton (excluding dinoflagellate and haptophytes) genera from each of the sampled geographic regions amplified using universal 18S ribosomal RNA primers. No raphidophytes or dictyochophytes were detected. X = Unclassified from the higher rank of taxonomic classification.
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Figure 6. Relative abundance of dominant dinoflagellate genera from each of the sampled geographic regions amplified using (A) Universal 18S ribosomal RNA primers and (B) Dinoflagellate specific 28S ribosomal RNA primers. X = Unclassified from the higher rank of taxonomic classification.
Figure 6. Relative abundance of dominant dinoflagellate genera from each of the sampled geographic regions amplified using (A) Universal 18S ribosomal RNA primers and (B) Dinoflagellate specific 28S ribosomal RNA primers. X = Unclassified from the higher rank of taxonomic classification.
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Figure 7. Relative abundance of dominant haptophyte genera from each of the sampled geographic regions amplified using (A) Haptophyte specific 18S ribosomal RNA primers and (B) Haptophyte specific 28S ribosomal RNA primers. X = Unclassified from the higher rank of taxonomic classification.
Figure 7. Relative abundance of dominant haptophyte genera from each of the sampled geographic regions amplified using (A) Haptophyte specific 18S ribosomal RNA primers and (B) Haptophyte specific 28S ribosomal RNA primers. X = Unclassified from the higher rank of taxonomic classification.
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Figure 8. The effects of climate change stressors (e.g., temperature, pH, nutrients, hypoxia, salinity, turbidity, and anthropogenic) on Harmful Algal Blooms (HABs) and fish and shellfish species. Alterations in HAB concentration, species composition, biogeography, seasonality, and toxicity in a changing environment, combined with an altered physiological state of fish and shellfish species, could results in antagonistic, additive or synergistic effects on commercially important species. Image: Eden Cartwright, Bird Circus.com.
Figure 8. The effects of climate change stressors (e.g., temperature, pH, nutrients, hypoxia, salinity, turbidity, and anthropogenic) on Harmful Algal Blooms (HABs) and fish and shellfish species. Alterations in HAB concentration, species composition, biogeography, seasonality, and toxicity in a changing environment, combined with an altered physiological state of fish and shellfish species, could results in antagonistic, additive or synergistic effects on commercially important species. Image: Eden Cartwright, Bird Circus.com.
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Table
Table 1. Harmful algal bloom species which have bloomed in New Zealand (NZ) waters and their known effects on commercially important shellfish and fish species. NZ refs are in bold.
Table 1. Harmful algal bloom species which have bloomed in New Zealand (NZ) waters and their known effects on commercially important shellfish and fish species. NZ refs are in bold.
ClassGenusSpecies #Effects on Shellfish and Fish Exposure toKey References
BacillariophyceaePseudo-nitzschia Larvae of Pecten maxiumus: growth, development and survival reducedDomoic Acid (DA)[46]
P. australis (DA-producer)
P. fraudulenta (DA-producer)		Juvenile P. maximus & Crassostrea gigas: Preferential filtration of non-toxic algae
C.g.: Reduction in clearance rate (P. australis only)		Whole cell culture[47]
P. multiseries (DA-producer)Juvenile & adult C. virginica: increased pseudofaeces production, lower filtration ratesWhole cell culture[48,49,50]
C.v. & Mytilus edulis: selective rejection of toxic cellsWhole cell culture[51]
M.e.: no effect on larval survival & development but, increased phenoloxidase productionWhole cell culture & DA[52]
Adult C. gigas: Reduction in the number and phagocytic activity of hemocytesWhole cell culture[53]
P. delicatissima (non-toxic)Adult C.v.: lower filtration rateWhole cell culture[50]
Juvenile sea bass (Dicentrarchus labrax): mucus over production in gillsWhole cell culture[54]
DictyophyceaePseudochattonellaP. verruculosa (Hara & Chihara) Mortality of sea-cage salmon, Oncorhynchus tshawytschaField bloom[43]
DinophyceaeAlexandrium Adult and larvae of various fish spp.: mortalities and impairment of sensory-motor functionField blooms, whole cell culture, paralytic shellfish toxins & saxitoxins[19] (and references there in)
Alexandrium pacificumAdult Perna canaliculus: Reduction in byssus production, reversable temporary increase in oxygen uptakeWhole cell culture[55,56] (as A. tamarense)
P.c. spat (2 mm): Reduction in byssal pad production and growthWhole cell culture[57]
Adult Pecten novaezelandiae: clearance rate reduced and altered in other bivalve species.Whole cell culture[58,59]
(as A. tamarense)
Adult Argopecten irradians, Geukensia demissa, Mercenaria mercenaria, Mya arenaria, Mytilus edulis, Ostrea edulis, Paphies donacina, Placopecten magellanicus and Spisula solidissima: various effects including shell valve closure, changes in clearance rate, production of mucus, inhibition of byssus production, violent swimming & erratic siphon activityWhole cell culture[34,55,60,61,62]
(as Gonyaulax tamarensis, Protogonyaulax tamarensis and A. tamarense)
Juvenile C. gigas: changes in hemocyte parametersWhole cell culture[63] (as A. catenella)
A. irradians larvae: increased mortalities; reduced activity, and growth of larvae; reduced attachment and climbing ability of juvenilesWhole cell culture & saxitoxin[64,65]
(as A. tamarense, strain ATHK)
Alexandrium minutumAdult C. gigas: reduced clearance and filtration rate, increased shell micro-closures, inflammatory response in digestive gland, increased circulating hemocyte concentration and phagocytic ability, genotoxic effects and increased detoxification/antioxidant gene expression. Reduced motility and ATP content of sperm, smaller larval size and increased mortalities at settlementWhole cell culture[66,67,68,69,70,71,72,73]
Gametes and larvae of C.g.: increased ROS in oocytes, decrease in sperm viability & fertilization. Reduced larval hatching, swimming, feeding, growth, settlement and survivalWhole cell culture[16,17,74]
Adult P. maximus: delayed shell growth, alteration of sensing processes, less efficient escape response, muscular damageWhole cell culture[75]
Cerataulina pelagicaC. pelagicaMortality of Fin fish & shellfishField bloom (lack of oxygen)[76]
GonyaulaxGonyaulax fragilisMortality of marine fauna including fin-fish.Field bloom (slime)[77]
Dinophysis Lethal and sub-lethal effects on various fin fish species, including: behavioural changes, poor co-ordination, inactivity, oxidative stress and histological changes in adults, and: reduced hatching, swimming activity, growth & feeding of larvaeOkadaic Acid & dinophysis toxins[18] (and references there in)
Dinophysis acuminataAdult C. gigas, Perna perna & Anomalocardia brasiliana: Changes in the hemocyte immunological parameters, especially in P. perna. Hemocyte infiltration in the digestive gland of C. gigas.Field bloom[78,79]
Gametes of C.g.: increased oocyte mortality & reduced fertilization successWhole cell culture[80]
GymnodiniumGymnodinium catenatumMortality of finfishField blooms[81,82]
C. gigas spat (3 mm): reduced clearance rate, increased valve closure & pseudofaeces production. Inflammation of the gill and digestive glandWhole cell culture[83,84]
C.g. larvae: no observable effectsWhole cell culture[85]
Juvenile Argopecten ventricosus & Nodipecten subnodosusWhole cell culture[86,87,88]
KareniaK. brevisulcatum (Chang) Gert Hansen & MoestrupMortalities of fish and shellfishField blooms[89,90]
Mortality of various larval & juvenile fish and shellfish species (Oncorhynchus tschawytscha, Chrysophrys auratus, P. canaliculus, Evechinus chloroticus and Haliotis iris, Pleurobranchia maculata, C. gigas)Whole cell culture, cell free culture, SPE extract, purified brevisulcatic acids[91]
K. mikimotoi (Miyake & Kominami ex Oda) Gert Hansen & MoestrupFish (Sciaenops ocellatus) erythrocytes: hemolytic activityCrude algal extract[92]
Lethal and sublethal effects on finfish and shellfishField blooms, whole cell culture[23,93,94,95] (and references there in)
Fin fish, eel and abalone mortalitiesField blooms[96,97,98]
Various adult shellfish species: reduced clearance rates, changes in immune functions, reduced escape locomotion and paralysisField blooms, whole cell culture[33,61,93,99,100,101,102,103,104] (as Gyrodinium aureolum)
Various larval shellfish species: embryo, larval and spat mortalities, reduction in activity rateWhole cell culture, SPE extract, bloom water, filtered bloom water[85,91,105,106,107,108,109]
K. sellifomis Haywood, Steidinger & MacKenzieMortality of various fin fish & shellfish, especially Haliotis iris, Paphies subtriangulata & P. canaliculusField bloom[110,111]
Mortality of various fin fish & shellfishField bloom[112,113] (references there in)
C. gigas larvae: mortalitiesWhole cell culture[114]
Adult Ruditapes philippinarum: hemocyte variables changedWhole cell culture[103,115]
K. umbella de Salas, Bolch & HallegraeffMortalities of Oncorhynchus mykiss & Salmo salarField bloom[116]
OstreopsisO. cf. siamensisMortalities of sea urchins, Evechinus chloroticusField bloom[117,118]
HaptophyceaePrymnesiumP. calathiferum Chang & RyanFish and shellfish mortalitiesField bloom[119]
RaphidophyceaeHeterosigmaH. akashiwo (Hada) SourniaMortality of O. tschawytschaField bloom[41,120]
Mortalities of various juvenile and adult fin fishField blooms, toxins from blooms[94,121,122,123]
Pinctada fucata martensii & Argopecten irradians gametes & larvae: Reduced sperm swimming velocity, increased mortalities & abnormalities, reduced activity of trocophore & D-larvaeCell free culture, whole cell culture[124,125,126]
Adult C. virginica: shell closure, reduction in filtration and increased hepatopancreas lysosomal destabilizationWhole cell culture[32,127]
C. virginica and M. mercenaria hemocytes (in vitro): mortalityWhole cell culture, culture filtrate[33]
FibrocapsaF. japonicaAdult C. virginica: increased lysosomal destabilization in digestive glandBloom water[128]
Solea solea larvae: mortalityWhole cell culture, culture extracts[129]
#: Species classifications based on AlgaeBase (Guiry in [130]). Alexandrium classification as for [131]. A. catenella (=A. fundyense).
Table
Table 2. Harmful algal bloom species which have been detected but not bloomed in New Zealand waters and their known effects on commercially important shellfish and fish species. NZ references are in bold.
Table 2. Harmful algal bloom species which have been detected but not bloomed in New Zealand waters and their known effects on commercially important shellfish and fish species. NZ references are in bold.
ClassGenusSpecies #Effects on Shellfish and FishExposure toKey References
DinophyceaeAlexandriumA. ostenfeldiiAdult Ruditapes philippinarum & C. gigas: tissue inflammatory response, changes in hemocyte morphology, oxidative stress response in the gillsWhole cell culture[173,174]
Cochlodinium (=Margalefidinium)C. polykrikoidesMortalities of finfishField blooms[94,175]
Adult Argopecten irradians, C. gigas, M. mercenaria: mortalities and reduced growthField blooms[176] (and references there in)
Juvenile A. irradians and Cyprinodon variegates: mortalitiesWhole cell culture, cell free culture medium[177]
HeterocapsaH. cf. circularisquama HoriguchiPinctada fucata, C. gigas, M. galloprovincialis, Venerupis philippinarum, Suculus diversicolor: Adults: Mortalities, reduced filtration rate. Larvae: activity rate, development rate and survival reducedField blooms, bloom water, whole cell culture[29,85,178,179,180]
H. illdefina (Herman & Sweeney) Morrill & Loeblich IIINone known [114,181]
KarlodiniumK. veneficum (Ballentine) LarsenFin fish mortalitiesField bloom, whole cell culture, cell lysate[182,183,184]
C. virginica & C. ariakensis larvae, spat & juveniles: increased mortalities & abnormalities, reduction in swimming and activity, reduced growth rates.Whole cell culture[185,186,187,188,189]
Juvenile & adult Mytilus edulis & Mercenaria mercenaria: increased hemocyte phagocytosis and ROS production, reduced growth ratesWhole cell culture[188,190]
PfiesteriaPfiesteria spp.Fin fish mortalitiesField blooms[191,192]
P. piscicida Steidinger & BurkholderA. irradians, C. gigas & C. virginica larvae: mortalitiesWhole cells[193,194]
P. shumwayae Glasgow & Burkholder (syn. Pseudopfiesteria shumwayae (Glasgow & Burkholder))Ichthyotoxic in vitroWhole cell culture[195]
A. irradians, C. virginica, M. mercenaria, Perna viridis: mortalities of larvae & adultsWhole cell culture[196]
ProrocentrumP. rathymum Loeblich, Shirley & SchmidtC. gigas spat: mortalityMethanol extracts[197]
HaptophyceaeChrysochromulinaC. leadbeateri Estep, Davis, Hargreaves & SieburthMortalities of Salmo salarField bloom[27,198]
PavlomulinaP. ranunculiformis Sym, Pienaar & Kawachi Attaching to C. gigas larvaewhole cell culture[28]
RaphidophyceaeChattonellaC. antiqua (Hada) Ono (syn.
C. marina var. antiqua (Hada) Demura & Kawachi)		Fin fish mortalitiesField bloom[94,199]
Mortalities Thunnus maccoyiiField bloom[200,201]
Pinctada fucata martensii: reduced sperm swimming velocity, increased larval mortalities & abnormalities, reduced activityWhole cell culture[124,125]
#: Species classifications based on AlgaeBase (Guiry in [130]). Alexandrium classification as for [131].
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Rolton, A.; Rhodes, L.; Hutson, K.S.; Biessy, L.; Bui, T.; MacKenzie, L.; Symonds, J.E.; Smith, K.F. Effects of Harmful Algal Blooms on Fish and Shellfish Species: A Case Study of New Zealand in a Changing Environment. Toxins 2022, 14, 341. https://doi.org/10.3390/toxins14050341

AMA Style

Rolton A, Rhodes L, Hutson KS, Biessy L, Bui T, MacKenzie L, Symonds JE, Smith KF. Effects of Harmful Algal Blooms on Fish and Shellfish Species: A Case Study of New Zealand in a Changing Environment. Toxins. 2022; 14(5):341. https://doi.org/10.3390/toxins14050341

Chicago/Turabian Style

Rolton, Anne, Lesley Rhodes, Kate S. Hutson, Laura Biessy, Tony Bui, Lincoln MacKenzie, Jane E. Symonds, and Kirsty F. Smith. 2022. "Effects of Harmful Algal Blooms on Fish and Shellfish Species: A Case Study of New Zealand in a Changing Environment" Toxins 14, no. 5: 341. https://doi.org/10.3390/toxins14050341

APA Style

Rolton, A., Rhodes, L., Hutson, K. S., Biessy, L., Bui, T., MacKenzie, L., Symonds, J. E., & Smith, K. F. (2022). Effects of Harmful Algal Blooms on Fish and Shellfish Species: A Case Study of New Zealand in a Changing Environment. Toxins, 14(5), 341. https://doi.org/10.3390/toxins14050341

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