Pectina hidrolisada de polpa cítrica na nutrição de tilápia do Nilo (Oreochromis niloticus)

Abstract

The objective of this study was to test a new prebiotic obtained from the citrus pulp, developed in the fishery laboratory of the Federal University of Santa Maria, and to evaluate the effects of its inclusion in the diet of Nile tilapia (Oreochromis niloticus). For 45 days, 600 Nile tilapia (initial weight 5.56 ± 1.31g) were kept in 20 polypropylene boxes with a useful volume of 160 liters (30 fish / box), of a water recirculation system. The animals were fed three times daily with isoprotein and isoenergetic experimental diets, where 0, 1.5, 2.5, 3.5 and 4.5 g kg-1 cellulose were replaced with orange hydrolyzed pectin. The design was entirely randomized with five treatments and four replicates, the data were submitted to normality test and linear regression analysis. At the end of the experimental period the hematological parameters, zootechnical, bromatological, digestive indices and metabolic parameters were evaluated. The growth of the animals was excellent even though no effect was observed on the results at any level of hydrolyzed pectin incorporation, all parameters remained similar with the control diet. It is concluded that the non-commercial prebiotic citrus pulp hydrolyzed pectin had no influence on the development of the Nile tilapia fingerlings in the experimental condition in which the animals were exposed, not being harmful to them.