Bacterial microflora of fishes is part of a complex ecosystem responsible for a variety of diseases in fish and man. A survey was conducted to determine the occurrence and antimicrobial susceptibility of microorganisms from the gastrointestinal tract of 220 fishes belonging to two specie Clarias gariepinus and Heterobranchus species. | Occurrence and antimicrobial susceptibility pattern of bacteria isolated from gastrointestinal tract of fresh Water Fishes in Abuja Nigeria