Diversity and characterization of antagonistic bacteria from tropical estuarine habitats of Cochin, India for fish health management

Nair, V Anusree and Vijayan, K K and Chakraborty, Kajal and Leo Antony , M (2012) Diversity and characterization of antagonistic bacteria from tropical estuarine habitats of Cochin, India for fish health management. World Journal of Microbiology and Biotechnoly , 28 . pp. 2851-2592.

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Abstract

Mortalities due to pathogenic bacteria are a major problem in aquaculture, especially in larval rearing systems. Use of antibiotics to overcome this problem is not an option any more due to the increasing antibiotic resistance among pathogens. The present study aims to understand the diversity of bacteria with antagonistic properties in the tropical estuarine habitats of Cochin, located along the southwest coast of India, and to use them as an alternative to antibiotics in aquaculture. Among the 4,870 isolates screened, approximately 1% showed significant antibacterial activity against six common aquaculture pathogens belonging to the genera Aeromonas and Vibrio. The antagonistic bacteria were identified as Bacillus(81%)and Pseudomonas(19%) using biochemical and 16SrRNA gene sequence homology. The isolates showing stable and higher levels of antibacterial activity were subjected to enzymatic expression profile, antibiotic resistance pattern and abiotic stress tolerance assays. As a result, five Pseudomonas spp. and four Bacillus spp., were identified as promising antagonistic isolates that could be exploited as probionts or microbial products(MP’s), to control bacterial diseases in aquaculture rearing systems.

Item Type:Article
Uncontrolled Keywords:Antibacterial diversity, Aquaculture, Bacterial antagonism, Fish health management, Tropical estuarine habitats
Subjects:Fish Biotechnology
Fish and Fisheries > Fish Disease
Divisions:CMFRI-Cochin > Marine Biotechnology
ID Code:9041
Deposited By:Arun Surendran
Deposited On:25 Sep 2012 13:33
Last Modified:25 Sep 2012 13:33

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