线性回归法实现半滑舌鳎幼鱼表型性状与体重的通径分析

Path Analysis between Morphometric Attributes and Body Weight on Juvenile Cynoglossus Semilaevis by Multiple Regression

为探讨半滑舌鳎(Cynoglossus semilaevis)形态性状对体重的影响,实验随机选取137尾半滑舌鳎幼鱼为研究对象,测量全长、体长、体高、体厚、头长、吻端至鳃裂前缘长6个形态性状,并称量其体重.采用相关分析和通径分析的方法计算各形态性状对体重的直接和间接作用,找出主要影响因子,并建立多元回归方程.结果表明,实验所测定的各形态性状间表型相关均达到极显著水平(P<0.01);各形态性状通过其它形态性状的间接作用均大于其直接作用,说明体重的主要影响因素是由多个形态性状组成的.采用逐步线性回归的方法建立了多元回归方程y=-77.901+2.404X_1+6.168X_3+33.046X_4+2.950X_5,其中Y为体重(g),X_1为体长(cm),X3为体高(cm),X_4为体厚(cm),X_5为头长(cm).经回归预测,估计值与实际观察值差异不显著,说明该方程可以简便可靠的应用于良种选育及实际生产中.

The effects of morphometric attributes on body weight for Cynoglossus semilaevis were analyzed in this study.Six morphometric attributes including full length,the body length,height,thick,head length and snout to branchial cleft edge length,and body weight were collected from 137 juvenile Cynoglossus semilaevis.The correlation coefficients and path coefficients among the attributes were calculated,and the relationship between morphometric attributes and body weight were analyzed.The results showed that the correlation coefficients between each morphometric attribute and the weight achieved very significant difference levels(P < 0.01).Direct effect from morphometric attribute to body weight was smaller than its indirect effect.The multiple regression equation of body length(X_1),height(X_3),thick(X_4)and head length(X_5) to the body weight was obtained to estimate body weight(Y),Y =-77.901+ 2.404X_1+6.168X_3+33.046X_4+2.950X_5.This paper provides a theoretical method to measure Cynoglossus semilaevis in aquaculture.