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    Isolation and screening of fish gut actinomycetes for antibacterial activity against Uropathogenic Escherichia coli
    (2023-09-01)
    Jisha, K.
    ;
    Gayathri, G.
    ;
    Gopikrishnan, V.
    ;
    Vareeket, R.
    ;
    Prabha, T. R.
    Actinobacteria are among the most studied prokaryotes due to their propensity to create microbial bioactive compounds. Actinobacterial members can be found in a wide variety of aquatic and terrestrial settings, incorporating marine habitats. Actinomycetes isolated from the marine environment are gaining popularity due to their diverse structures and unique biological properties of the secondary metabolic products. The research was investigated the antibacterial properties of actinobacteria associated with gut of marine fish against human pathogen. Approximately 20 morphologically distinct strains obtained from Engraulis sp. (anchovy fish) and Trachurus trachurus (horse mackerel) were proved for antibacterial efficacy against Extended spectrum beta-lactamase (ESBL) producing uropathogenic Escherichia coli (UPEC). The actinobacterial strain HM7 expressed antibacterial effect against UPEC.
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    Fish gut microbiota: a source of novel metabolites – A review article
    (2023-03-01)
    Jisha, K.
    ;
    Gayathri, G.
    ;
    Gopikrishnan, V.
    ;
    Song, J. J.
    ;
    Soytong, K.
    Similar to human beings, fish harbor microorganisms in their gastrointestinal tract (GIT). Fishes are diverse groups of gut microbiota, including protists, fungi, yeasts, viruses, bacteria, and archaea. In addition to serving as a barrier against infections, these microbes that inhabit the gastrointestinal tract of fish play a role in nutrition, physiology, immunity, and life span. All fish have gut microbiota; however, the makeup of these communities varies depending on the fish's life stages, the habitat they live in, their nutrition, the seasons, their trophic level, etc. For both recreational and commercial fisheries, it is crucial to comprehend the bacterial make-up of fish microbiomes. The gut microbiota aids in the development of methods for modifying the gut microbiota of the target fish species to enhance aquaculture quality. These gut microbes are an invaluable, essential source of novel, promising bioactive compounds with significant biological activity. The natural product secondary metabolites from specific strains of Chaetomium spp. may develop to be biomedicine for sustainable protection. This review provides a comprehensive knowledge of the composition of the gut microbiota of fish, their development, changes in the living environment, their modification, and their applications.