Impact of poly culture on some productive traits of two species of carp fish (common carp Cyprinus carpio L. with grass carp Ctenopharyngodon idella reared in floating cages

Abstract

This study was conducted to determine the effect of rearing common carp Cyprinus carpio L. with grass carp Ctenopharyngodon idella, as a poly culture on some productive traits, were reared according to the floating cage system. Three treatments were used; T1:  20 common carp fish were used, T2:   20 grass carp fish were used, T3: 10 common carp fish and 10 grass carp fish were used. By 6 floating cages of 4 m3 in size, made of galvanized iron, were prepared.The best productive traits were in T3, in which common carp and grass carp were put in poly culture . We conclude from this study that the poly culture of common carp with grass carp achieves the best production traits.