The prevalence and characterization of pathogenic bacteria from fish cultured in ponds fertilized with organic manures was studied. Almost the same type of bacterial species were isolated from organic manures, ponds water and organs of fish. Chicken manure supported more bacterial species as proved by its high total aerobic bacterial count than cow manure. Total aerobic bacterial count differed significantly in different organs of fish in three ponds except in case of liver. High prevalence of Aeromonas sp. was found in all systems except in chicken manure treated pond, where Pseudomonas...