Abstract: Sea urchin (Strongylocentrotus intermedius) purebreds were established by using artificial insemination (1♂:3♀), and the phenotype characters (shell length, shell height, and body weight) of thirty individuals of each purebred from 5-15 months old to sexual maturation (17 months old) were analyzed. The correlation analysis of the characters was carried out, and the growth prediction model was constructed. There were no significant differences (P>0.05) in the phenotype characters among the individuals of the purebreds at 5-15 months old, but significant differences for those at sexual maturation (P<0.05). The growth of shell length and shell height showed linear models, while that of body weight showed an exponential model. The multiple correlation coefficient (R²) of the phenotype characters was 0.68-0.86. The body weight at 17 months old could be predicted by that at 11 months old, with the accuracy of 73.6%. There was no strong relationship between the parents and the offspring in the phenotype characters (R²=0-0.25). This study contributed to deepen our understanding of the growth pattern of S. intermedius, and provided theoretical basis for the construction of healthy aquaculture mode.

Key words: Jute, ISSR, Genetic diversity, Consanguinity