Abstract
The generic composition of intestinal aerobic microflora of Tilapia (Sarotherodon niloticus) were examined in fish obtained from two different locations. Vibrio, Aeromonas and Pseudomonas were identifide as the dominant genera in fish intestine according to the identification scheme of SHEWAN et al. Vibrio isolates were differentiated from Aeromonas isolates on the basis of sensitivty to 0/129, no growth on Rimler-Shorts medium, negative result to sucrose-fermentation and starch-hydrolysis test. Variations in the occurrence of Vibrio and Aeromonas species were observed at different times of the year. These patterns differed to some extent between the fishes from the respective sites.
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