Effect of dietary digestible energy level on growth indices of kutum (Rutilus frisii kutum Kamenskii, ۱۹۰۱)

A ۶۰-days feeding trail was conducted to evaluate the effects of dietary digestible energy levels (DE) on kutum, Rutilus frisii kutum. Four is nitrogenous (۳۵% protein) diets with digestible energy levels of ۲۵۰۰, ۲۶۰۰, ۲۷۰۰ and ۲۸۰۰kcal kg-۱ was tested. Two hundred and forty advanced fry (۲±۰.۴g) were randomly distributed in ۱۲ fiberglass tanks of ۴۰۰L capacity. Nutritional responses in terms of WG, FCR and PER as well as survival rate (SR) significantly improved (p<۰.۰۵) with increase in DE level from ۲۵۰۰ to ۲۸۰۰ kcal kg-۱ diet, but no difference between ۲۶۰۰ and ۲۷۰۰kcal kg-۱ diet was found. Body crude protein and fat significant were increased (p<۰.۰۵) when the dietary energy was raised up from ۲۵۰۰ to ۲۶۰۰kcal DE kg-۱ diet, but a further increase on energy did not improve the fish crude protein and fat content.

Keywords:

Rutilus frisii kutum , Nutritional evaluation , Digestible energy , Growth performance