Preliminary Studies on Water Characteristics and Bacterial Population in Various Tissues of Catla catla

Aquaculture is concerned with the propagation and rearing of aquatic organisms. Many peoples are turning to aquaculture to improve the food production and to contribute for economic development. The present investigation, water sample and infected fish (catla catla) were collected in cultural pond from saliamangalam. Analysis of physicochemical parameters in water sample and bacterial populations were studied in skin, gill, fin and intestine of Catla catla by using bacterial culture medium. From the water quality analysis it clearly indicates that, changes in temperature, low oxygen level, low alkalinity, high organic load, decreased level of nitrite. Bacterial studies clearly indicate that there was no bacterial growth in control plate, the various infected fish tissue sample inoculated plates were showed significant growth of bacterial colonies, such as Flexdacterium sp, Yersinia sp, Renibacterium sp, Mycobacterium, Edwerdsiella ictaluri, pseudomonas sp, Aeromonas sp, found in predominantly. From the present study it was concluded that bacterial pathogens are most significant microbial agents affecting freshwater fishes (Catla catla) and climatic changes may play a great role in modulating the occurrence of bacterial fish diseases. Key word: Catla catla, physicochemical parameters, Bacterial population, Bacterial infection. 1