Abstract

The present research aimed to determine the reproductive performance of intra and interspecific of tow tilapia species; Nile tilapia and Blue tilapia under different stocking densities and the same breeding parameters. Eight tanks with a volume of 1.8 m3 were used to accommodate two storage densities; 1:3 and 2:6 males and females of both species. The physicochemical parameters of the water were more or less stable in all tanks. The sizes and the survival rates of larvae 20 days post-hatching of various couplings were measured to determine the performance of their growths. The results obtained for the density 1:3 shows that the reproduction occurs early compared to the other density. Also, the intra-specific coupling was more fertile than the inter-specific one; latter showed that the crossing between the male blue tilapia and female Nile tilapia is more productive than the reciprocal crossing. The larvae of intra-specific crossing of Nile tilapia have the largest size in his age group.