Estimates of genetic parameters for growth traits in larval and juvenile sea urchin Strongylocentrotus intermedius
HAN Fen-jie1,ZHANG Wei-jie1,QIN Yubo2,CHEN Shun1, ZHOU Mi1,CHEN Xiao-hui1,CHANG Ya-qing1
1.Key Laboratory of Mariculture&Stock Enhancement in North China's Sea,Ministry of Agriculture,Dalian Ocean University,Dalian 116023,China; 2.Liaoning Province Marine Environmental Forecasting Center,Shenyang 110001,China
Abstract: The body length of four-armed larva,six-armed larva,eight-armed larva and shell diameter of juvenile sea urchin Strongylocentrotus intermedius(30 days post fertilization)were measured in forty-four full-sib families by an unbalanced nest design and genetic parameters for growth traits were estimated using animal model technology and restricted maximum likelihood method(REML).The results showed that heritability of body length was 0.705±0.373 in four-armed larvae and 0.538±0.444 in eight-armed larvae,higher than heritability(nearly zero)in six-armed larvae and diameter in the juveniles.Common environmental effects at each larval stage and juvenile stage were ranged from 0.048 to 0.352,and genetic correlations of body length of different stage larvae were positive and ranged from 0.300 to 0.518.While all genetic correlations of larval body length were negative at each stage and shell diameter of juveniles ranging from-0.152 to-0.435.The findings will provide guidance to the indirect selection and pre-selection in selective breeding of sea urchin.
2017, Vol. 32 
