Aquaculture saince utilization of wheat bran in the diet of common carp Cyprinus carpio

Abstract

Two experiments were conducted to evaluate the effect of wheat bran as a partial replacement of soybean meal and corn meal in the diet of common carp Cyprinus carpio. In these experiments, four experimental diets contained 0%, 10%, 20%, or 30% wheat bran were used. In experiment I, a triplicate experiment was conducted using fish with an initial body weight of 23 ± 0,13 g. Fish were cultured in floating net cage with size of 2 x 2 x1 m3 at Cirata lake, with a density of 250 fish/cage. Fish fed on the diet at satiation for 60 days. In experiment II, the diets were subjected to indirect digestibility test by using 0,05% Cr2O3 as a tracer. Two groups of fish with an initial body weight of 6 ± 0,12 g and 50 ± 0,18 g were held in aquaria 60 x 40 x 40 cm3 at density of 20 fish/aquaria. Feces were collected daily, 60 minutes after feeding, feces collection were done for 15 days. The results showed that utilization of wheat bran from 0 to 30% in the diet was not significantly affected the growth performance of fish, including protein retention, feed efficiency and daily growth rate. Those growth performance were in the range of 20,16 – 20,69%, 35,79 – 38,63%, and 93,44 – 98,03% respectively. Regardless of fish size, it was also found that protein digestibility of the diet was decreased when wheat bran was used in the diet at level of 20% or more. Based on the calculation of the price of diet to produce 1 kg of fish, it was found that the diet contain 20% of wheat bran had the most lowest production cost. It can be concluded that wheat bran can be used as a partial replacement of soy bean meal and fully replacement of corn meal for common carp up to 30%.