中文摘要：

研究了2月龄和18月龄不同生长阶段的黄姑鱼体质量等9个表型性状的相关关系,采用通径分析方法计算了以体质量为依变量,其他性状为自变量的通径系数和决定系数,并对线性方程加以回归。结果表明,不同的生长阶段体质量的变异系数均为最大;2月龄的全长（0.576）与18月龄的体高（0.558）对体质量的直接作用最大,2月龄的全长与躯干长共同（0.4250）和18月龄的体高（0.3114）是决定体质量的主要性状;通过逐步回归分析方法,经偏回归系数显著性检验,建立了体质量为因变量,2月龄黄姑鱼的最优线性回归方程：y=-0.964＋0.724x4＋0.289x1（r2=0.957）;18月龄黄姑鱼的最优线性回归方程：y=-600.412＋54.162x7＋18.03x1（r2=0.943）;如果在这两个生长阶段对黄姑鱼进行性状选择育种,可以重点根据全长、躯干长、体高性状进行选择育种,对体质量进行间接选择育种,从而保证选择育种的效果。

英文摘要：

The correlation analysis and path anlysis were used to study the effects of morphometric traits on body weight in spotted maigre Nibea albiflora at different stages of 2-month-old individuals and 18-month-old individuals.The results showed that the maximal variable coefficient of the body weight was observed at different stages;especially in body length of 2-month-old（0.576）and body height of 18-month-old（0.558）.The total length and body length of 2-month-old（0.4250）and body heigth（0.3114）of the 18-month-old fish were the major trait correlated with the body weight.Through stepwise regression analysis method and partial regression coefficient significance test,we established the quality as the dependent variable.The optimal linear regression equation of 2-month-old spotted maigre：y=-0.964＋0.724x4＋0.289x1（r2=0.957）;the optimal linear regression equation of 18-month-old spotted maigre：y=-600.412＋54.162x7＋18.03x1（r2=0.943）;in the two stage select breeding of spotted maigre,we can focus on body length and body height traits in selective breeding,and indirect selective breeding of the body quality,to ensure the effect of selective breeding.