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Metabolites
Special Issues
Glycolipid Metabolism and Health of Aquatic Animals
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Glycolipid Metabolism and Health of Aquatic Animals

A special issue of Metabolites (ISSN 2218-1989). This special issue belongs to the section "Nutrition and Metabolism".

Deadline for manuscript submissions: closed (31 July 2023) | Viewed by 3880

Special Issue Editors

Dr. Mo Peng

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Guest Editor
College of Animal Science and Technology, Jiangxi Agricultural University, Nanchang, China
Interests: glycolipid metabolism; nutrition physiology and regulation
Special Issues, Collections and Topics in MDPI journals
Dr. Chaobin Qin

E-Mail Website
Guest Editor
College of Fisheries, Henan Normal University, Xinxiang, China
Interests: Nutritional and endocrine regulation of glucose/lipid me-tabolism in aquatic animals
Dr. Sakhawat Hossain

E-Mail Website
Guest Editor
Department of Aquaculture, Faculty of Fisheries, Sylhet Agricultural University, Sylhet, Bangladesh
Interests: aquatic animal nutrition; alternative lipids; nutritional physiology of fish

Special Issue Information

Dear Colleagues,

Aquatic animals could provide high-quality protein and fat for humans. However, there are two key problems which need to be resolved: Firstly, the mechanism of the glycolipid metabolism is unclear and the precise nutrition demand parameters are lacking. Secondly, fish meal and oil production for the diets of aquatic animals have been found to be insufficient, including the production of high-fat and high-carbohydrate diets as substitutes to save fish meal and oil for economic reasons. These two diets also have detrimental effects on the metabolism, physiology and health of aquatic animals, which have been characterized by dyslipidemia, impaired liver and intestinal structure and function (gut–liver axis dysfunction), poor meat quality, insufficient immunity and stress tolerance, lower antioxidant capability,  decreased growth performance and higher mortality. Therefore, researchers must explore the mechanisms clearly and seek suitable therapies to alleviate these harmful symptoms.

This Special Issue of Metabolites aims to publish high-quality original research articles and reviews containing following topics: 1) exploration of the regulatory metabolisms of key regulatory elements and signal pathways; 2) analysis of the cooperation of glucose and the lipid metabolism; 3) revelations regarding the metabolic characteristics of the glycolipid metabolism in different aquatic animals; 4) investigation of the deep mechanisms of the two high-energy diets regarding the ways in which they have detrimental effects to physiology, metabolism and health; 5) explorations of the nutritional regulation strategies for improving the glycolipid metabolism and health under normal conditions or high-energy feeding; 6) creating or using novel detecting and/or data analysis tools to help solve the above five problems.

Dr. Mo Peng
Dr. Chaobin Qin
Dr. Sakhawat Hossain
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Metabolites is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2700 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • glycolipid metabolism
  • physiology
  • health
  • gut–liver axis
  • feed additive
  • growth performance

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Published Papers (2 papers)

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Research

10 pages, 5744 KiB  
Article
Establishment of a Rapid LAMP Assay for Aeromonas hydrophila and Comparison with the Application of qPCR
by Zihui Gao, Chunhua Yang, Xiaobo Zhang, Bing Hu, Huang Zhang, Zhihong Zhang, Wendong Kuang, Qiuyue Zheng and Jijuan Cao
Metabolites 2023, 13(7), 841; https://doi.org/10.3390/metabo13070841 - 12 Jul 2023
Cited by 2 | Viewed by 1368
Abstract
The development of an exceptionally sensitive diagnostic technique for early identification of aquaculture diseases, specifically Aeromonas hydrophila, is essential for efficient management of disease outbreaks at aquaculture locations. In this research, a swift and sensitive diagnostic assay employing Loop-mediated isothermal amplification (LAMP) of [...] Read more.
The development of an exceptionally sensitive diagnostic technique for early identification of aquaculture diseases, specifically Aeromonas hydrophila, is essential for efficient management of disease outbreaks at aquaculture locations. In this research, a swift and sensitive diagnostic assay employing Loop-mediated isothermal amplification (LAMP) of Aeromonas hydrophila was devised and compared to the conventional qPCR method documented by Rong Wang. Validation of the diagnostic assay was carried out using actual samples obtained from aquaculture fish. The findings revealed that based on the rapid detection of crude bacterial genomic DNA, the fluorescent LAMP assay possessed a lower limit of detection (LOD) of 0.559 ng/μL (0.315–1.693, 95% CI), while the LOD for qPCR stood at 4.301 ng/μL (2.084–8.876, 95% CI). Both techniques demonstrated outstanding specificity, exhibiting no cross-reactivity with bacteria from the same or closely related genera. A total of 74 fish samples suspected to be infected with the fish disease were gathered, with 26 and 23 samples testing positive for Aeromonas hydrophila via LAMP and qPCR, respectively. The concordance analysis for LAMP and qPCR methods generated a Kappa value of 0.909 (0.778–1.000, 95% CI), signifying a high degree of diagnostic consensus. This study highlights that the LAMP assay eliminates the thermal cycle temperature change process of qPCR, uses lysate to crudely extract bacterial genomic DNA, and can complete the detection within 40 min, rendering it a practical and efficient alternative for monitoring disease outbreaks at aquaculture sites. Full article
(This article belongs to the Special Issue Glycolipid Metabolism and Health of Aquatic Animals)
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15 pages, 3081 KiB  
Article
Adult Triploid Rainbow Trout Can Adapt to Various Dietary Lipid Levels by Coordinating Metabolism in Different Tissues
by Gege Liu, Lixia Chen, Haining Tian, Guoliang Sun, Fulei Wei, Yuqiong Meng and Rui Ma
Metabolites 2023, 13(3), 396; https://doi.org/10.3390/metabo13030396 - 8 Mar 2023
Cited by 3 | Viewed by 1655
Abstract
Triploid rainbow trout can adapt to various dietary lipid levels; however, the mechanisms of systematic adaptation are not well understood. To investigate how adult triploid rainbow trout maintains lipid hemostasis under different exogenous lipid intake, a 77-day feeding trial was conducted. Diets with [...] Read more.
Triploid rainbow trout can adapt to various dietary lipid levels; however, the mechanisms of systematic adaptation are not well understood. To investigate how adult triploid rainbow trout maintains lipid hemostasis under different exogenous lipid intake, a 77-day feeding trial was conducted. Diets with lipid contents of 20%, 25%, and 30% were formulated and fed to triploid rainbow trout with an initial weight of 3 ± 0.02 kg, and they were named L20, L25, and L30 group, respectively. Results showed that the condition factor, hepatosomatic index, liver color, and plasma triglyceride were comparable among three groups (p > 0.05), whereas the value of specific growth rate, viscerosomatic index, and liver glycogen content gradually increased with increasing dietary lipid level (p < 0.05). A significantly highest value of plasma glucose and nonesterified fatty acids were found in the L30 group (p < 0.05), whereas the significantly higher content of plasma total cholesterol, high-density lipoprotein–cholesterol, and low-density lipoprotein–cholesterol was found in the L25 group compared with those in L20 group (p < 0.05). As for lipid deposition, abdominal adipose tissue, and muscle were the main lipid storage place for triploid rainbow trout when tissues’ weight is taken into consideration. Overall quantitative PCR showed that the lipid transport and glycolysis were upregulated, and fatty acids oxidative was downregulated in liver when fish were fed low lipid diets. It meant that the liver was the primary lipid metabolizing organ to low lipid diet feeding, which could switch energy supply between glycolysis and fatty acids oxidation. Fish fed with a moderate dietary lipid level diet could increase lipid uptake and promote lipogenesis in muscle. Abdominal adipose tissue could efficiently uptake excess exogenous free fatty acid through upregulating fatty acid uptake and synthesis de novo and then storing it in the form of triglyceride. Excess lipid uptake is preferentially stored in abdominal adipose tissue through coordinated fatty acid uptake and fatty acid synthesis de novo as dietary lipid levels increased. In summary, triploid rainbow trout can adapt to various dietary lipid levels by coordinating metabolism in different tissues. Full article
(This article belongs to the Special Issue Glycolipid Metabolism and Health of Aquatic Animals)
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