612 bacterial strains from shrimp ponds and 10 freshwater strains which had been transplanted on the 2216E marine agar repeatedly were checked for their degrading abilities to the organic pollutants. 10 strains were selected by evaluating the growth on the shrimp-feed-medium, BOD in the liquid media and their extroenzymes activities. All these 10 strains were able to produce gelat inase, lipase ( Tween - 80) and 8 of these strains produced lecithinase, 9 produced amylase, 2 produced casinase, 1 produced alginase. All of them were able to degrade the feed of shrimp from 46. 5% to 59. 5% in two days and from 50. 8% to 72. 2% in five days. By the traditional physical and chemical methods, 3 of these strains were identified as Vibrio spp. , 3 as Pseudomonas spp. , 2 as Photobacterium spp. , 1 as Aeromonas spp. , and 1 as Bacillus subtilis.