基于全同胞组内相关法估计“中科2号”海湾扇贝(Argopecten irradians)幼虫期壳长的遗传力。通过平衡巢式交配实验设计构建了7个半同胞和21个全同胞“中科2号”海湾扇贝家系。在家系幼虫期的第1天和第6天分别测定每个全同胞家系的30个幼虫个体的壳长。利用SAS 9.0软件的一般线性模型(GLM)计算表型变量的原因方差组分，估算壳长遗传力。分析结果显示，“中科2号”海湾扇贝幼虫1日龄和6日龄壳长的遗传力分别为0.51和0.58。t 检验显示两个日龄壳长遗传力的估计值均不显著(P>0.05)，且6日龄雌性遗传方差组分大于雄性遗传方差组分，说明雌性遗传方差组分随日龄增长可能存在较大母性效应。较大的加性遗传方差表明选择育种对于“中科2号”海湾扇贝的早期生长尚具有较大的改良潜力。%In this study, we estimated the heritability of the shell length of the Zhongke No. 2 bay scallop, Argopecten irradians,by performing an intra-group correlation of full-sibs at 1 day and 6 days after hatching. Each sire was mated with three dams in a balanced nested design, and 7 half-sib groups and 21 full-sib families were produced in total. We calculated the causal components of the phenotypic variance using the general linear model (GLM) procedure and SAS 9.0 software. The results showed that the heritabilities of shell length of 1 day and 6 days were 0.51 and 0.58, respectively. The heritabilities of both these stages failed to reach their prominent level by t checkout. Maternal genetic variance was significantly greater than paternal genetic variance in 6 days, which indicates the existence of greater maternal effect. The estimated heritability indicated great additive variation in growth at the larval stage. This additive variation suggests a reasonable potential for the improvement of larval growth of the Zhongke No. 2 bay scallop for further selective breeding.
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