The Growth and Production of Grass Carp (Ctenopharyngodon idella) and Common Carp (Cyprinus carpio) in mono and poly culture System

In this study mono and poly culture systems for two species of Grass Carp (Ctenopharyngodon idella) and Common Carp (Cyprinus carpio) were compared and the effects of the culture system on the specific growth rate, total production and survival rate studied.Three treatments were considered in this trial which are as follows: Grass Carp in a single species culture system (n=20) (Tank No. 1), Common Carp in a single species culture system (n=20) and poly culture of Common Carp (n=10) and Grass Carp (n=10). Culture tanks were individually equipted with a closed circulating water system . The avarage final weight of the Grass Carp in mono and poly culture system were 25.08 and 18.79 and for Common Carp 46.08 and 37.5 mg, respectively; and there were no significant differences between the two culture systems (P