为了查明近江牡蛎养殖群体数量性状间的相关性及影响产量的因素组成，随机选取140只2.5龄贝，对其形态性状（壳长、壳高、壳宽）和重量性状（活体重、软体重）等5个数量性状进行测量，并应用遗传相关、多元回归、通径分析、决定系数等方法讨论了形态性状对重量性状的影响。结果表明受测的5个数量性状间的相关性均达到显著水平（P < 0.05），相关系数从0.16710到0.81988。形态性状对活体重和软体重具有相同的影响：对二者起直接作用最大的均是壳高，其值分别为33.84%和34.20%；对二者起间接作用最大的均为壳长，其值分别为17.84%和13.23%；壳宽的作用最小。多元回归分析建立了壳长（x1）、壳高（x2）、壳宽（x3）3个估计活体重（Y1）和软体重（Y2）的回归方程，分别为: Y1 = -104.50715 + 1.29795x1 + 0.91435x2 + 1.39589x3 (R2 = 0.7818), Y2 = -10.54062 + 0.14956x1 + 0.14361x2 + 0.12205x3 (R2 = 0.6008)。本研究结果为近江牡蛎选择育种提供了理论依据，即以提高活体重或软体重为目标，主要选择壳高，同时加强对壳长的协同选择。

To clarify correlation among quantitative traits and compositions influencing production, five quantitative traits including three morphological traits (Shell length, shell height, and shell width) and two weight traits (Live body weight and tissue weight) of Jinjiang oyster Crassostrea hongkongensis were measured and analyzed from 140 randomly chosen individuals by correlation analysis, multiple regression analysis, path analysis and determination coefficient analysis. The results showed that there were significant correlations (P < 0.05) among the five measured traits, and correlation coefficient ranged from 0.16710 to 0.81988. Morphological traits made the same effects on two weight traits of live body weight and tissue weight. Shell height gave directly predominant effect on live body weight and tissue weight, and the value was up to 33.84% and 34.20%, respectively; shell length gave indirectly predominant effect on live body weight and tissue weight, and the value was up to 17.84% and 13.23%, respectively. Regression equations between weight of live body weight (Y1) and tissue weight (Y2) and morphological traits of shell length (x1), shell height (x2), and shell width (x3) were also established, and equations were as followed: Y1 = -104.50715 + 1.29795x1 + 0.91435x2 + 1.39589x3 (R2 = 0.7818), Y2 = -10.54062 + 0.14956x1 + 0.14361x2 + 0.12205x3 (R2 = 0.6008). The present results provide a theoretical basis for selective breeding in Jinjiang oyster, that is, shell height should be firstly selected and shell length should be simultaneously selected in order to improve live body weight and tissue weight via morphological traits.