【摘 要】
：
A2×2 factorial cross between two populations of Pacific abalone Haliotis discus hannai Ino,collected separately from Dalian(D)in China and Miyagi(M)in Japan,wa
【机 构】
：
Institute of Oceanology,Fisheries College
论文部分内容阅读
A2×2 factorial cross between two populations of Pacific abalone Haliotis discus hannai Ino,collected separately from Dalian(D)in China and Miyagi(M)in Japan,was conducted to compare performances in fertilization rate,hatching rate,metamorphosis rate and growth at days 20,43,160 and 330 between purebreds (DD and MM)and crossbreds(DM and MD)and investigate the magnitude of heterobeltiosis(better parent)and heteresis(mid-parent).Heterobehiosis and heterosis for all the traits analyzed were evidently different between crossbreds DM and MD.Heterobeltiosis in the crossbred DM varied among traits,with values of 2.5%for the fertilization rate.2.2%for the hatching rate,-1.9%for the metamorphosis rate and 7.4%for the growth at the day 330.The crossbred DM displayed positive heterotic values for fertilization rate(5.4%),hatching rate(7.4%),metamor-phosis rate(7.6%)and growth(12.0%)at the day 330.However,both heterobehiosis and heterosis for all the traits in the crossbred MD were negative except those for the growth at days 20 and 43.The results indicate the importance of selecting superi-or hybrid varieties if the exploitation of hybrid vigor is considered in the Pacific abalone breeding program.
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