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Background: The genetic improvement in growth and food habit domestication of largemouth bass (Micropterus salmoides) have made breakthroughs in past decades, while the relevant work on disease resistance were rarely carried out. Major histocompatibility complex (MHC) genes, which are well known as their numbers and high polymorphisms, have been used as candidate genes to mine disease-resistant-related molecular markers in many species.
Methods And Results: In present study, we developed and characterized 40 polymorphic and biallelic InDel markers from the major histocompatibility complex genes of largemouth bass. The minor allele frequency, observed heterozygosity, expected heterozygosity and polymorphic information content of these markers ranged from 0.0556 to 0.5000, 0.1111 to 0.6389, 0.1064 to 0.5070, and 0.0994 to 0.3750, respectively. Three loci deviated significantly from Hardy-Weinberg equilibrium, while linkage disequilibrium existed at none of these loci.
Conclusion: These InDel markers might provide references for the further correlation analysis and molecular assisted selection of disease resistance in largemouth bass.
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http://dx.doi.org/10.1007/s11033-024-09429-1 | DOI Listing |
J Fish Biol
September 2025
College of Animal Science and Technology, Yangzhou University, Yangzhou, China.
Citrobacter freundii, a common zoonotic pathogen affecting humans, livestock and fish, is recognized for its substantial impact on largemouth bass (Micropterus salmoides) mortality. However, the mechanisms of C. freundii infection in largemouth bass remain poorly understood.
View Article and Find Full Text PDFProbiotics Antimicrob Proteins
September 2025
College of Fisheries, Henan Normal University, Xinxiang, 453007, PR China.
Clostridium butyricum has gained attention as a probiotic in aquaculture due to its ability to improve growth, gut health, and immune function. However, most strains currently used are derived from non-aquatic sources, which may limit their colonization and efficacy in fish. In this study, a novel strain, C.
View Article and Find Full Text PDFElife
September 2025
State Key Laboratory of Breeding Biotechnology and Sustainable Aquaculture, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, China.
IgM emerged in jawed vertebrates 500 Mya and remains the most evolutionarily conserved antibody class. However, despite extensive studies on IgM as an ancient antiviral weapon in warm-blooded vertebrates, its role and mechanisms in combating viral infections in early vertebrates remain poorly understood. Here, significant virus-specific sIgM titers are generated in the serum and gut mucus of a teleost fish (largemouth bass) that survive infection, and fish lacking sIgM were more susceptible to viral infection.
View Article and Find Full Text PDFJ Fish Dis
September 2025
College of Fisheries, Research Center for Aquatic Biodiversity Conservation in the Upper Reaches of Yangtze River, Southwest University, Chongqing, China.
Aeromonas hydrophila can cause disease in various aquatic animals, but there exist no effective alternatives to control its outbreak. In this study, diseased largemouth bass were collected from the breeding farm Lake Dahong (Chongqing, China), a strain SK-2 was isolated and identified as A. hydrophila.
View Article and Find Full Text PDFViruses
July 2025
Washington Animal Disease Diagnostic Laboratory, College of Veterinary Medicine, Washington State University, 1940 Olympia Avenue, Pullman, WA 99164, USA.
We performed a diagnostic disease investigation on a wild smallmouth bass () with skin ulcers that was collected from Lake Oahe, South Dakota, following reports from anglers of multiple fish with similar lesions. Gross and histologic lesions of ulcerative dermatitis, myositis, and lymphocytolysis within the spleen and kidneys were consistent with largemouth bass virus (LMBV) infection. LMBV was detected by conventional PCR in samples of a skin ulcer, and the complete genome sequence of the LMBV (99,184 bp) was determined from a virus isolate obtained from a homogenized skin sample.
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