Abstract
Abstract An investigation was conducted to identify the bacterial isolates and to study the antibiotic resistance patterns of Aeromonas spp. and Salmonella spp. from the skin, gills, and gut of the fresh water loach, Lepidocephalichthys guntea (HAMILTON BUCHANAN) and water sampled from four different sites along the River Lotchka in Darjeeling District, West Bengal, India. Isolated bacteria were identified by different biochemical procedures, and Polymerase Chain Reaction was performed using genus specific 16S rDNA primers for confirmation of identification of Aeromonas spp. and Salmonella spp. Antibiotic susceptibility test of bacterial isolates was also done by Disc Diffusion method. A total of 49 Aeromonas spp. and 24 Salmonella spp. were isolated from tested samples. Maximum resistance was exhibited for Penicillin-G, Ampicillin, and Cephalothin (>75% resistant Aeromonas spp. and >60% Salmonella spp. in the four different sites of river and body parts of fish). Ciprofloxacin and Tetracycline resistance was almost nil. The results indicated that the river water and resident fish were contaminated with multi-antibiotic resistant enteric pathogenic bacteria. This study, thus, provides valuable information for making policy decisions aimed at reducing microbial contamination of fish and the indiscriminate use of antibiotics.
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