Abstract:To study the difference in morphological characters of the Scapharca broughtonii Schrenck between Jiangsu population and Tonguing population, data for this were collected randomly from the two populations. The shell length（X1）,shell height（X2）,shell width（X3）,Umbo length（X4）,Outer ligament length（X5）,Dorsal edge length（X6）,Radial rib length（X7）,and the live body weight（Y）were measured individually. The correlation between the phenotypic data and the body weight, the direct and indirect effect of body size to body weight were analysed by using correlation analysis and path analysis, and then to establish the regression equation by the morphological characters using as independent variables and the body weight as dependent variable. The results show that correlation coefficients between each phenotypic traits and body weight are all significantly fifferent（ P＜0.01）in the two populations. The shell length（X1） and shell width（X3） give predominant direct and determination indirect on the body weight of Jiangsu population, while for the Tongying population the shell length（X1） and the shell height（X2） are the key factors to affect the body weight. Eliminate the inconspicuousness factor, and establish the multiple regression equation for the the two bloody clam as : 1)For Jiangsu population Y= -77.05+1.366X1+1.306X3;2)For Tongying population Y=-108.22+1.979X1+0.964X2. This study provided a theoretical basis for bloody clam breeding and morphologic study.
