عنوان مقاله [English]
نویسندگان [English]چکیده [English]
This study was conducted to investigate the possibility of replacing the fish meal instead of hydrolyzed cow skin in the diet of ornamental Fish (Flower horn). Growth, nutrition efficiency and survival rates of 216 fishes, with average weight and length 0.95±0.2 grams 3.7±0.2 cm using six types of diets formulated iso- caloric with different percentages of (zero, 20, 40, 60, 80 and 100), hydrolyzed protein cow skin in the form of six treatments, each with three replicates were examined during the 100 days. The fish were biometry measured every 20 days. At the end of experiment, fish fed with diet containing 40% hydrolyzed cow skin with means of final weight, weight gain, feed conversion ratio and percent weight gain Respectively 3.87g, 2.92 g, (2.06±0.31) and (%290.47±76.49) had the highest growth rate. These parameters in fish fed with 100% hydrolyzed cow skin were 2.50 g, 1.6 g, (3.04±0.48) and (%198±74.37) respectively, showed the lowest growth (P<0.05). Therefore, the optimal level of hydrolyzed cow skin instead of replacing the fish meal in the diet of ornamental fish (Flower horn) with respect to the economic costs of production and use; 40% are recommended.