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Fishes
Special Issues
Fish Diseases Diagnostics and Prevention in Aquaculture
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Fish Diseases Diagnostics and Prevention in Aquaculture

A special issue of Fishes (ISSN 2410-3888). This special issue belongs to the section "Welfare, Health and Disease".

Deadline for manuscript submissions: 20 May 2024 | Viewed by 2460

Special Issue Editor

Prof. Dr. Yichao Ren

E-Mail Website
Guest Editor
School of Marine Science and Engineering, Qingdao Agricultural University, Qingdao 266237, China
Interests: probiotics; bacteriocin; immunostimulants; antibiotic substitution; microbiota; ecological aquaculture; environmental stress; nutrient flux

Special Issue Information

Dear Colleagues,

With the continued growth of the global population and the overexploitation of fisheries resources, aquaculture has become an important source of high-quality food. However, infectious diseases limit the sustainability and capacity of aquaculture, highlighting the importance of effective pathogen control strategies. There is an urgent need to investigate strategies for diagnosing and preventing fish diseases in aquaculture. Innovative technologies, methods, and theories are needed to detect, diagnose, and prevent various diseases in fish, to understand their occurrence patterns, and to prevent their development.

This Special Issue aims to collect the latest research on diagnosing and preventing fish diseases (i.e., bacterial, fungal, viral, and parasitic) in aquaculture and provide healthy culture models and techniques. Potential topics include disease detection, immunization/immunotherapy, antibacterial/antibiotic replacement, and ecological farming. The included studies will help develop effective strategies to protect fish health from serious infectious diseases.

Prof. Dr. Yichao Ren
Guest Editor

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. Fishes 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 2600 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

  • fish disease
  • diagnosis
  • infection
  • emerging technologies
  • disease prevention
  • ecological aquaculture
  • sustainable aquaculture

Published Papers (3 papers)

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Research

14 pages, 5372 KiB  
Article
Mechanism of Ligilactobacillus salivarius GX118 in Regulating the Growth of Rainbow Trout (Oncorhynchus mykiss) and Resistance to Aeromonas salmonicida Infection
by Xiyu Cao, Bowen Wang, Wenhao Ren, Jiang Wang, Qi Liu, Yichao Ren and Xianliang Meng
Fishes 2024, 9(5), 157; https://doi.org/10.3390/fishes9050157 - 27 Apr 2024
Viewed by 241
Abstract
Lactic acid bacteria Ligilactobacillus salivarius has been shown to be a substitute for antibiotics in the treatment of bacterial disease in high animals. However, its beneficial mechanism in fish farming is still unclear. This study evaluated the antagonistic effects of the Ligilactobacillus salivarius [...] Read more.
Lactic acid bacteria Ligilactobacillus salivarius has been shown to be a substitute for antibiotics in the treatment of bacterial disease in high animals. However, its beneficial mechanism in fish farming is still unclear. This study evaluated the antagonistic effects of the Ligilactobacillus salivarius GX118 strain on Aeromonas salmonicida and its regulation of rainbow trout growth in vivo and in vitro. The results found that GX118 produces an antibacterial substance that can directly destroy the cell wall of A. salmonicida. Whole-genome sequencing of GX118 revealed that Enterolysin A is a type III bacteriocin with antibacterial properties. An in vivo experiment showed that the supplementation of GX118 in diet competitively inhibited the colonization of A. salmonicida in the intestine. In addition, it was able to improve the growth performance of rainbow trout within a 21-day feeding experiment. The supplementation of GX118 increased the diversity of gut microbiota, in which the abundance of Bacteroidota, Blautia, and Rhodobacteraceae increased. In addition, the use of GX118 activated the expression of IFN-γ and NF-κB genes and reduced the expression level of IL-6 and IL-8, thus exhibiting a certain effect on activating the immunity of rainbow trout. This study provides a scientific basis for the development of antibacterial probiotics in the healthy farming of rainbow trout. Full article
(This article belongs to the Special Issue Fish Diseases Diagnostics and Prevention in Aquaculture)
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11 pages, 1610 KiB  
Article
Evaluation of Immune Protection of a Bivalent Inactivated Vaccine against Aeromonas salmonicida and Vibrio vulnificus in Turbot
by Yunji Xiu, Jingyuan Yi, Ruixin Feng, Jiaxue Song, Yunfei Pang, Peng Liu and Shun Zhou
Fishes 2024, 9(4), 131; https://doi.org/10.3390/fishes9040131 - 09 Apr 2024
Viewed by 562
Abstract
The Aeromonas salmonicida is responsible for causing furunculosis in various fish species. Furunculosis is a ubiquitous disease that affects the aquaculture industry and causes the mass mortality of turbot. Vibrio vulnificus is a pathogen that causes skin ulcers and hemorrhagic septicemia in fish, [...] Read more.
The Aeromonas salmonicida is responsible for causing furunculosis in various fish species. Furunculosis is a ubiquitous disease that affects the aquaculture industry and causes the mass mortality of turbot. Vibrio vulnificus is a pathogen that causes skin ulcers and hemorrhagic septicemia in fish, resulting in significant mortality in aquaculture. In this study, we have established a bivalent inactivated vaccine against A. salmonicida and V. vulnificus with Montanide™ ISA 763 AVG as an adjuvant. This bivalent inactivated vaccine was used to immunize turbot by intraperitoneal injection, and the relevant immune indexes were detected. The results demonstrate that the bivalent inactivated vaccine exhibited a relative percent survival (RPS) of 77% following A. salmonicida and V. vulnificus intraperitoneal challenge. The vaccinated group exhibited higher levels of acid phosphatase activity and lysozyme activity compared to the control group. ELISA results showed a significant increase in serum antibody levels in immunized turbot, which was positively correlated with immunity. In the kidney tissue, related immune genes (TLR5, CD4, MHCI and MHCII) were up-regulated significantly, showing that the vaccine can induce cellular and humoral immune responses in turbot. In conclusion, the bivalent inactivated vaccine against A. salmonicida and V. vulnificus was immunogenic, efficiently preventing turbot from infection, which has the potential to be applied in aquaculture. Full article
(This article belongs to the Special Issue Fish Diseases Diagnostics and Prevention in Aquaculture)
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14 pages, 3150 KiB  
Article
Molecular Characterization and Antibacterial Potential of Goose-Type Lysozyme from Japanese Pufferfish (Takifugu rubripes)
by Xinyu Cao, Zhen Yang, Minghong Gao, Xu Yang, Shuhui Wang, Ruihu Zhao, Lei Chen, Chen Jiang and He Wang
Fishes 2023, 8(12), 577; https://doi.org/10.3390/fishes8120577 - 26 Nov 2023
Viewed by 1247
Abstract
Lysozyme plays a crucial role in the innate immune response against bacterial phagocytosis by hydrolyzing the peptidoglycan layer of the bacterial cell wall. In this study, we characterized a goose-type lysozyme gene (TrLysG) in Japanese pufferfish. It is made up of [...] Read more.
Lysozyme plays a crucial role in the innate immune response against bacterial phagocytosis by hydrolyzing the peptidoglycan layer of the bacterial cell wall. In this study, we characterized a goose-type lysozyme gene (TrLysG) in Japanese pufferfish. It is made up of an ORF of 573 bp that encodes a polypeptide of 190 amino acids. TrLysG includes a characteristic bacterial soluble lytic transglycosylase (SLT) domain, which contains three catalytic residues (Glu71, Asp84 and Asp95) and a highly conserved GLMQ motif (Gly90, Leu91, Met92 and Gln93). Phylogenetic analyses revealed that TrLysG is clustered together with its counterparts from other teleost fishes. Furthermore, mRNA expression analyses showed that TrLysG was highly expressed in healthy mucosal tissues (intestines and gills), and considerably up-regulated in response to Vibrio harveyi infection in the intestines, gills, and liver. At pH 6 and 55 °C, the pure recombinant TrLysG (rTrLysG) exhibits optimum activity. It also displayed antimicrobial activity against three Gram-positive bacteria (Streptococcus parauberis, Staphylococcus pasteuri and Staphylococcus epidermidis) as well as five Gram-negative bacteria (Shewanella, Aeromonas hydrophila, Escherichia coli, Vibrio parahaemolyticus and V. harveyi). Our results highlighted the significant role of TrLysG in immune defense against invading pathogens, thereby contributing to the prevention and alleviation of disease spread in aquaculture. Full article
(This article belongs to the Special Issue Fish Diseases Diagnostics and Prevention in Aquaculture)
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