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Paper Details

Bacterial Flora Associated with Intestine of Tropical Estuarine Fish Species

C.N. Ariole1* and N. A. Kanu2

Journal Title:Journal of Chemical, Biological and physical sciences
Abstract


The intestinal microflora of three fish species (Tilapia guineensis, Sarotherodon melanotheron and Liza falcipinnis) from three rivers (Bonny River, New Calabar River and Sombriero River) in the brackish water zone of the Nigerian Coast was investigated. Populations of aerobic heterotrophic bacteria present in the digestive tracts of fish species and in rivers were estimated using spread plate method. The total heterotrophic, proteolytic, amylolytic, hydrocarbon-degrading and total coliform bacteria in the digestive system of fish were abundant and ranged from 6.60 to 6.88logcfu/g, 5.38 to 5.53logcfu/g, 5.3 to 5.61logcfu/g, 5.68 to 5.95cfu/g and 5.20 to 5.70logcfu/g respectively. The counts varied among fish species and were higher than in water. The culturable bacterial genera in the digestive tract of fish were identified as Aeromonas, Bacillus, Pseudomonas, Staphylococcus, Salmonella, Vibrio, Escherichia, Flavobacterium, Lactobacillus, Micrococcus and Enterobacter. The results indicate that intestinal bacteria possess enzymatic activity that may be beneficial for the fish. The presence of opportunistic pathogens may predispose the fish to bacterial epizootics especially if populations are stressed by environmental contaminants.

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