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

Noverian H. A. نويسنده , Shabanipour N. نويسنده , Khoshkholgh M. R. نويسنده , Hosseini M. R. نويسنده

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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.

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