Abstract:

In order to clarify correlation among quantitative traits and compositions influencing production clarify the correlation index and determinant coefficients between phenotypic traits and body-tissue weight of Mactra chinensis in different sexes, five metric traits including shell length (X1), shell height (X2), shell width (X3), live body weight (X4) and body-tissue weight (Y) were measured and analyzed from 115 chosen individuals at two-years-old. The results showed that the difference on phenotypic characters of the Mactra veneriformis in different sexes was not significant (P>0.05); The correlativity among the five measured traits in both females and males was significant (P<0.01); Determinant coefficients analysis showed that the mean characters that effect body-tissue weight were different; In females, shell height which had the largest direct effect was the key effective factor on body-tissue weight, and shell height had significant indirect effect on body-tissue weight through shell length; Shell height gave predominant effects on body-tissue weight in males, and gave indirectly predominant effect via live body weight body-tissue; The multiple regression equation of both females , (P<0.01) and males , (P<0.01)) was established by using the stepwise regression method. This study provided a theoretical basis and measure indicatrix for the breeding of Mactra chinensis.