Hidrolisado proteico de pescado em dietas para alevinos de tilápia do Nilo

Abstract

The growing demand for aquaculture feed of excellent nutritional quality to maximize the performance of animals raised. However, stagnation and decreased availability of ingredients that fulfill the nutritional requirements of the fish depend on both the nutritional equivalent substitutes as financial environment. Thus, this study aims to evaluate the inclusion of fish protein hydrolyzate in diets for fingerlings of Nile tilapia Oreochromis niloticus. 300 fish (5.4 ± 0.9 g) were distributed in a completely randomized in 20 polythene containers of 250 L with five treatments and four replicates were used design. Vegetable diets were formulated to be isonitrogenous and isocaloric consists of corn, corn gluten meal, wheat bran, soybean meal and soybean oil were added and the levels of hydrolyzed fish and one control diet (0%) and four test feed containing 1, 2, 3 and 4% fish protein hydrolyzate, based on dry matter. The animals were fed to satiation four times daily for 112 days. At the end of the experimental period, the animals were measured and weighed to determine the final weight, total length, survival rate, weight gain, specific growth rate, feed conversion ratio and condition factor. Levels hydrolyzed influenced the productive aspects of the Nile tilapia, which by quadratic regression we estimate the optimal inclusion of 1.79% for final weight, 1.77% to gain weight, 1.75% to rate and the specific growth rate to 1.97% protein efficiency. However, it is suggested to Nile tilapia inclusion of 1.78% of fish protein hydrolyzate for better productive performance.