Abstract: The eggs of Fangzheng silver crucian carp(Carassius auratus auratus) as gynogenetic crucian carp were activated by homogenous and by heterogeneous(common carp Cyprinus carpio and topmouth gudgeon Pseudoroashora parva) sperm,forming three offsprings Fangzheng silver crucian carp ♀× Fangzheng silver crucian carp♂(FF),Fangzheng silver crucian carp ♀× common carp ♂(FH) and Fangzheng silver crucian carp♀× topmouth gudgeon♂(FM).The fry of the three offsprings were reared in net cages disposed in a pond,and the survival,growth and sexual ratio were compared.The survival of FF((91.15±1.78)%) fry was shown to be very significantly higher than that in FM(87.50±2.13%)and FH(85.00±1.04%)(P〈0.01).The juveniles in FM(20.17±4.33 g) and FH(23.13±3.58 g) had significantly higher final body weight than that in FF(18.90±3.82 g)(P〈0.05).There were very significantly higher female proportion in the offsprings(99% in FM,73% in FF and 99% in FH)(P〈0.01).The results approved the biological effects of heterogametes and will be useful for the utilization of heterogametes.

Key words: Carassius auratus gibelio, heterogeneous sperm, absolute growth rate, survival rate, sex ratio, biological effect of heterogamete