Efeito da densidade de estocagem no desempenho produtivo da tilápia-do-nilo (Oreochromis nilolieus), mantida em sistema de criação intensiva, tipo raceway, durante o inverno

Abstract

Toe present experiment was carried out in order to evaluate the productive performance ofNile tilapia (Oreochromis niloticus) fingerling reveited for male. The fingerling was maintained under different stock deniili«I, iD intensive system type "raceway ", during lhe winter period. A complete Illlldn · ed-,erimental design was used with lhree stock densities, 7, 14 and 21 fish / lll3, and with two repctitions for treatment. The 252 fingerling selected for homogeneous weight were distributed in six concrete tanks in which lhe wat« was renewed every hour. Feeding rate was accomplished twice a day ad libitum. ln lhe first two months crumbly ration was supplied wilh 40% of crude protein and in the third month it was repbwed by extruded rationwilh35%ofCP. Theaveragesofwatertemperatun,intheperiodsofthemorning and afternoon were, respectively, of 19,6 and 22,6 ºC, considered Jow for lhe good development of this species.