Body composition is an analysis of carbohydrates, proteins, and moisture and ash contents of fish. The body composition was studied using as an index of growth studies of Indian major carp's Catla, Rohu and Mrigala and a minor carp Cyprinus carpio in the Halali and Tawa Reservoirs. The protein and lipid contents of three fish species showed the successive decrease in their estimated values, whereas muscle glycogen content in fish species understudy showed a significant increase during the study. The variation of Liver somatic index observed could be due to increased metabolic activity. Considering the fact of comparatively low-fat content all four species were found to be an ideal food for human being.