Pakistan Journal of Biological Sciences1028-88801812-5735Asian Network for Scientific Information10.3923/pjbs.2000.2199.2202Ctenopharyngodon idella]]>JavedM. WatanabeT. 122000312Seven diets with varying digestible protein/digestible energy (DP:DE) ratios were tested for growth and nutrient retention in fish body. Six test diets containing DE levels of 310, 3.30 and 360 Kcal/100 g at low (24%) and sub-optimum (28%) DP levels were tested against control having 30% DP and 3100 Kcal/100 g DE. However, the main protein source in control diet was fish meal while in all other six test diets corn gluten meal was provided. Significant differences (p<0.05) were observed in the percentage live fish weight gains at different levels of dietary protein and energy. Control fish receiving 30% dietary DP and protein/energy ratio of 81.93 gave the maximum gain in weight of 148.80±5.50%. However, among the six test diets, dietary P/E ratio of 73.75 shared the maximum weight gain (122.29±8.27%). Increase in dietary energy beyond 425.90 kcal/100 g resulted in significantly poor growth. Feed intake by the fish increased significantly with increasing dietary protein while decreased non-significantly with the increased dietary lipid and energy. The results indicate consumption dependent protein and energy retention in fish body as a function of dietary protein level.]]>Aoki, H., T. Watanabe, M. Furuichi and H. Tsuda,199745131139AOAC.,198414th Edn.,Cai, Z. and L.R. Curtis,199088313327Hashim, R., N.A.M. Saat and C.H. Wong,19941994pp: 660662Hashim, R., N.A.A. Razzaque, M. Kamal and M.N. Islam,1994Heteropneustes fossilis).]]>1994pp: 656659Javed, M.,199623338Ding, L.,1991Ctenopharyngodon idella.]]>1991pp: 89-96pp: 89-96Pfeiffer, T.T. and R.T. Lovell,199052213217Shireman, J.V., D.E. Colle and R.W. Rottmann,197812457463Smith, L.S.,19891989pp: 331-421pp: 331-421Steel, R.G.D. and J.H. Torrie,19862nd Edn.,Pages: 633Pages: 633Takeuchi, T., T. Watanabe and C. Ogino,197945977982