Abstract:The first generation of four broodstock combinations, C (♀) ×C (♂), J (♀) ×J (♂), J (♀) ×C (♂) and C (♀) ×J (♂) were obtained from mating and crossing within and between Japanese broodstock (J) and China disease resistante broodstock (C) of Japanese flounder Paralichthys olivaceus using complete diallel crosses. Comparisons of fertilization rate, hatch rate, albinism rate and survivorship were made among four treatments in this study. Heterosis and correlations were found in different characteristics. The results showed that there were significant differences between the hybridization groups and self-fertilized groups on albinism rate and survival rate. Heterosis on hatch rate reached 33.99% and heterosis on survivor rate reached 31.37% in C (♀) ×J (♂) group. Correction analysis demonstrated highly significant correlations (P<0.01) between fertilization rate and hatch rate (0.657), and fertilization rate and survival rate (0.432). These results indicated that the crosses between different stocks might be potentially effective for genetic improvement in Japanese flounder.
