DISTRIBUTION OF PSEUDOMONAS AERUGINOSA IN SWAMPS AND IT’S INFECTION TO OREOCHROMIS NILOTICUS

The bacterial load, Pseudomonas aeruginosa and their artificial infection to Oreochromis niloticus were studied in water of four swamps in the Rajshahi University campus during November, 2001 to October, 2002. The load of P. aeruginosa was found to vary from 6.80×10 5 to 5.08×10 6 ml-1. In artificial infection to Oreochromis niloticus, the mortality rates was recorded at 90, 50, 30, 20 and 0 % at 1.92 × 10 8, 1.92×10 7, 1.92×10 6 1.92×10 5 and 1.92×10 4 CFU fish ml-1, respectively. The average bacterial load in the swamps (1.92×10 6 CFU ml-1) was slightly higher than that prevailed in the control pond (1.90×10 6 CFU ml-1). Swamps can be utilized at the present bacterial load for the fish culture