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ISSN: 2473-3350

Journal of Coastal Zone Management
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Research Article

Probiotic Effect of Lactobacillus Isolates against Bacterial Pathogens in Fresh Water Fish

Abstract

A total of 59 Lactobacillus isolates were isolated from 5 different fresh water fish such as Cat fish ( Clarias
orientalis) , Hari fish (Anguilla sp), Rohu fish ( Labeo rohita), Jillabe fish (Oreochromis sp) and Gende
fish ( Punitus carnaticus). Among the 59 isolates only 4 Lactobacillus isolates were selected for further
study. Based on morphological and biochemical characteristics, the isolates were identified as
Lactobacillus sp. The pathogen were isolated from infected cat fishes, characterized and identified as Vibrio
parahaemolyticus, Aeromonas sp and Aeromonas salmonicida. The Lactobacillus isolates were screened for
antagonistic activity against Aeromonas, Vibrio sp. by agar diffusion assay. Among the 4 isolates,
Lactobacilli RLD2 showed significant antagonistic activity against Aeromonas and Vibrio sp alone. and was
further evaluated by standard plate count assay for the viability of pathogen. The isolate was multiplied and
the fish feed was supplement with Lactobacillus isolates. The results reveal that the size, weight of the fish
was statically increased in comparison to that of control fish. The present study concluded that the
Lactobacillus isolates could be used as probiotic bacteria in aquaculture, to manage aeromonasis.

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