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 dietary digestible 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.