EFFECT OF PHENOTYPIC MORPHOMETRIC TRAIT ON BODY WEIGHT AND SOFT-TISSUE WEIGHT OF NEVERITA DIDYMA
扁玉螺(Neverita didyma)表型性状对体重和软体部重的影响效应分析

Effect of phenotypic morphometric trait on body weight and soft-tissue weight of Neverita didyma was studied in correlation and path analysis. A hundred of two-year-old individuals were randomly sampled, from which eight traits were measured including shell width, shell height, height between apex and callus, body height, operculum length, operculum width, body weight, and soft-tissue weight. The correlation coefficients among the eight traits were calculated; and phenotypic traits were used as independent variables and body weight, and soft-tissue weight as dependent ones for path analysis. The results show that all the correlation coefficients between each phenotypic trait and body weight or soft-tissue weight are at extremely significant level (P<0.01). The shell width is the key effective factors. Direct selection of shell width is effective for increasing body weight and soft-tissue weight of Neverita didyma, followed by the heights between apex and callus, and operculum width and body height come the second.