COMPARATIONS OF EMBRYO DEVELOPMENT AND JUVENILE METAMORPHOSIS BETWEEN DIFFERENT HYBRIDIZATION GROUPS OF APOSTICHOPUS JAPONICUS(SELENKA)

Different hybridization groups of wild sea cucumber Apostichopus japonicus(Selenka) from Qingdao(Q),Yantai(Y),Weihai(W),Rizhao(R),Changdao(C) were studied in contrast with their self-breeding groups.By Duncan's multiple range tests,the rate of hatching, auricularia larvae survivorship,doliolaria apperance and rate of metamorphosis about different groups were compared and analysized.Results showed,in general,the hybridization groups had heterosis over the self-breeding groups,having significant differences at 5%level with the contrast groups.Thereinto,the groups of Y(♀)×Q(♂) and Q(♀)×w(♂) had the best hybridized effects.(Their rate of hatching,auricularia larvae survivorship,doliolaria apperance and rate of metamorphosis is 95.4%,95.2%,20%,93.8%;93.8%,90.1%, 15%,91.6%respectively);the groups of Y(♀)×W(♂),Y(♀)×R(♂)and W(♀)×R(♂) are in-between(the corresponding datas are:94.2%,87.2%,12%,91.2%; 93.6%,86.2%,12%,90.1%;96.1%,83.1%,10%,86.7%respectively);the effect of Q(♀)×C(♂)and W(♀)×C(♂)is unconspicuous(the corresponding datas are: 93.2,%,80.4%,10.5%,80.2%;90.7%,79.3%,9.5%,78.9%respectively).The research can provide important academic reference and practical directive meaning for science research and production in future.