Abstract:The Pacific oyster, , is an aquatic species which is widely cultivated globally and cultured mainly in Liaoning, Shandong, and Jiangsu Provinces in China. In recent years, various problems such as disease and natural-resource depletion have brought enormous economic losses to the culture industry of owing to its rapid expansion. Therefore, studies on selective breeding for more stress-resistant strains are necessary. In the present study, we estimated the growth performance, heritability, and breeding value of ‘Haida No.1’ to analyze the growth and breeding performance using full-sib family mating experiments. In 2015, 21 full-sib and seven half-sib families were bred. We measured the shell height, shell length, shell width, and total weight of 30 individuals in each family at 200 days after hatching. The results showed that the shell height, shell length, shell width, and total weight were 17%, 27%, 29%, and 85% higher on day 200 compared with the natural population respectively. The heritability on day 200 ranged from 0.128 to 0.145, which is medium-low heritability Phenotypic correlation and genetic correlation were positive and ranged from 0.730 to 0.962 and from 0.503 to 0.768 respectively. Comparisons between the selection based on breeding value and phenotypic value, were approximately 70% consistent at the individual level and 70%−90% consistent at the family level. Selection efficiency for growth traits was 3%−34% higher at the family level and 17%−28% higher at the individual level based on breeding value than that based on the phenotypic value. The study can provide basic data for management of and expanding ‘Haida No.1’.