Genetic parameter estimates for growth straits in the earlier larva stage of Hyriopsis cumingii

17 half-sib families and 51 full-sib families of Hyriopsis cumingii were constructed by nested design.40 individuals were randomly selected from each of these full-sib families when the individuals in the cages reached 1 cm,and the number was 2 040 in all.Shell length,shell height,shell width and body weight were measured of these individuals,and these data were used for genetic analysis.The heritability of these four traits was 0.356±0.047,0.488±0.060,0.453±0.055 and 0.518±0.050 respectively.The phenotype correlation and genetic correlation was between 0.476-0.709 and 0.574-0.868.There was enough genetic variance for selective breeding and when we have selective breeding program on weight,the other three traits would have some genetic improvement at the same time.