One of the most common carp in all of India is Rohu (Labeo rohita). In both wild and cultivated fish, bacteria are an important causative agent of fish diseases and cause severe losses. Some pathogens, particularly pseudomonads, aeromonads, vibrios etc., are present as skin infections. Human infections caused by these bacterial pathogens are common and associated with the different factors of fish and humans transmitted through fish or water environments.The aim of this work was to identify and isolate certain cases of fish diseases in causative bacterial pathogen with a view to establishing a local database on fish diseases in order to help identify diseases and increase understanding of the fish diseases in Marathwada fish farms. The Diversity of Bacteria associated with different parts of body namely skin, gills, mouth and intestine of fishLabeo rohita were studied. The different 13 types of bacteria isolated from different parts of body. The predominant bacterial genera associated with this fish were Pseudomonas, Aeromonas, Klebsiella, Proteus, Serratia, Micrococcus, Salmonella, E. coli, but Citrobacter, Staphylococcus, Flavobacterium, Shigella, Bacillus, Enterobacter, Alcaligens, Streptococcus, Corynebacterium, Chromobacterium, Clostridium.