Abstract:

To clarify correlation among quantitative traits and compositions influencing wet weight and the ratio of influence, the shell length, shell height and wet weight of 675 individuals that produced in the spring were measured during six months. The correlation coefficient matrix, path coefficient and determination coefficient of was calculated with path analysis. The shell length, shell height was used as the independent variables and wet weight was used as the dependent various for path analysis. The results showed that the correlation coefficient matrix between shell character and wet weight were all very significantly different (P<0.01). Shell length gave predominant direct effect (P1=0.867) on the wet weight, it is the key effective factor. Shell height gave slightly direct effect (P2=0.080) and significant indirect effect (0.862) through shell height on the wet weight. The multiple correlation matrix between shell length, shell height and wet weight was R2=0.897. The multiple regression equation relating the wet weight was W=-0.842+0.099SL+0.009SH. The results provided a theoretical basis for selective breeding in C. Farreri, that was shell height should be firstly selected and shell length should be simultaneously selected in order to improve wet weight.