翘嘴鳜形态性状对体质量的影响

Mathematical analysis of effects of morphometric traits on body weight of Siniperca chuatsi

对不同月龄的3个翘嘴鳜群体体质量、全长、体长、体高、头长、眼径、尾长、尾柄长和尾柄高等9个形态性状进行测定,运用相关分析、通径分析和多元回归分析研究9个形态性状对体质量的影响。相关分析结果表明,翘嘴鳜测量形态性状与体质量间相关系数均达到极显著水平(P<0.01)。通过多元回归分析发现,全长和体高等对体质量的回归系数在3个群体中均达到极显著水平(P<0.01),分别建立3个群体不同月龄的回归方程。剔除回归系数不显著的形态后,通径分析结果显示,全长和体高对体质量直接作用最大,随着月龄的增加有减小的趋势;全长和体高的综合决定系数变化不大,说明全长和体高是影响翘嘴鳜早期体质量的主要形态性状。

Effects of 9 morphometric traits on body weight of three aquaculture populations of mandarin fish（Siniperca chuatsi） were analyzed by using correlation analysis,multiple regression and path analysis.Data of body weight,total length,standard length,body depth,head length,eye diameter,trail length,caudal peduncle length,caudal peduncle depth were collected in this study.Results of correlation analysis showed that there were significantly correlations between most morphometric traits and body weight（P0.01）.According to the regression coefficient test,there was significant difference among different populations and multiple regression equation were set up to estimate body weight.Path analysis indicated that total length and body depth bared strong direct effect on body weight,and the path coefficients（Pi） and determination coefficient（di） decreased with the month age increasing.The comprehensive coefficient of determination of total length and body depth maintained stable,which indicated that body weight was mainly affected by total length and body depth at early age.This paper provides theoretical evidence and perfect measure target for breeding of Siniperca chuatsi in aquaculture.