Effect of dietary digestible energy level on growth indices of kutum (Rutilus frisii kutum Kamenskii, 1901).

A 60-days feeding trail was conducted to evaluate the effects of dietarydigestible energy levels (de) on kutum, rutilus jrisii kutum. four isonitrogenous (35% protein) diets with digestible energy levels of 2500, 2600, 2700 and 2800kcal kg^-1 were tested. two hundred and forty advanced fry (2±0.4g) were randomly distributed in 12 fiberglass tanks of 400l capacity. nutritional responses in terms of wg, fer and per as well as survival rate (sr) significantly improved (p<0.05) with increase in de level from 2500 to 2800kcal kg^-1 diet, but no difference between 2600 and 2700kcal kg^-1 diet was found. body crude protein and fat significant were increased (p<0.05) when the dietary energy was raised up from 2500 to 2600kcal de kg^-1 diet, but a further increase on energy did not improve the fish crude protein and fat content.