Microbiological Study of Costal Shrimp Aquaculture Production System of Bangladesh

Abstract

The study was intended to identify the common pathogen from water and soil sample of some costal shrimp Hatchery and Fisheries of Bangladesh and to demonstrate the probiotic efficacy against this pathogen. 8 samples were taken from 6 individual costal shrimp Hatchery and bacterial load was determined from them. During the period of study, a total number of 20 bacterial colonies were isolated according to morphological characteristics. Among them, 7 groups of isolates were screened for detail study, based on of their morphological and cultural characteristics. The isolates were identified through biochemical and microbiological characteristics as Aeromonas salmonicida, Vibrio parahaemolyticus, Bacillus fastidiosus, Vibrio vulnificus, E. coli, Vibrio harveyi and Aeromonas bestiarum. The susceptibility of the selected isolates against traditional antibiotic was performed by agar diffusion method using antibiotic disc. Rifampicin showed inhibitory effect against almost all organisms where as ampicillin is the antibiotic which had no effect on either of the isolates and penicillin is less effective than other antibiotics used. Probiotic efficacy of Bacillus & Pediococcus against the selected isolates was performed. Bacillus and Pediococcus showed a satisfactory antimicrobial effect against the selected isolates which revealed that; they are favorable for the biocontrol of microbial flora in shrimp hatchery and aquaculture.