3个红罗非鱼群体的形态差异分析

Morphological variation analysis of three populations of red tilapia

通过测定中国台湾红罗非鱼、以色列红罗非鱼和马来西亚红罗非鱼群体的形态参数,采用单因素分析、主成分分析和聚类分析3种多元分析方法,比较了3个红罗非鱼群体的形态差异。通过回归分析,建立多元回归方程,对比分析了3个群体间形态性状对体重的影响。6个可数性状分析结果表明,3个群体在可数性状上无显著差异。在与出肉率有较高相关系数的比例性状上,中国台湾红罗非鱼群体与以色列红罗非鱼、马来西亚红罗非鱼群体均存在显著差异。8个可量比例性状的聚类分析和主成分分析结果均表明,以色列红罗非鱼群体和马来西亚红罗非鱼群体形态最接近,而与中国台湾红罗非鱼群体形态差异较大。主成分分析构建了3个主成分,其贡献率分别为34.804%、16.667%、12.974%,累计贡献率为64.446%。回归分析结果表明,体长、体厚、尾柄高是影响中国台湾红罗非鱼和以色列红罗非鱼群体体重的主要性状,体长、体高、体厚是影响马来西亚红罗非鱼群体体重的主要性状。多元分析结果表明,3个红罗非鱼群体在形态上已经产生一定程度的差异,且主要表现在体高、头长、尾柄高、吻长、全长这5个形态性状指标上。

The morphometric differences among the three populations of red tilapia from Chinese Taiwan,Israel and Malaysia were studied with one-way ANOVA,cluster analysis and principal component analysis.Regression analysis was used to compare the impacts of morphological traits on body weight among three populations of red tilapia and establish the multiple regression equations. Analysis of meristic characters indicated that there were no significant differences among these strains. In the morphological traits which had higher value of correlative coefficient to fillet yield,there were significant differences between Chinese Taiwan strain and Israel strain,Malaysia strain. Cluster and principal component analysis showed that morphological characters were rather similar between Israel strain and Malaysia strain,from which Chinese Taiwan strain was different. Three principal components were constructed of which the contributory ratio,from high to low,were34. 804%,16. 667% and 12. 974%,summing up to 64. 446%. The results of regression analysis revealed that body length,body width and caudal peduncle depth were the key impact factors to body weight of the strains from Chinese Taiwan and Israel,and the traits affecting the body weight of Malaysia strain most converted to body length,body depth and body width. The results of multi-variant indicate that there are some morphological differences among the three populations of red tilapia and the indicators of morphological traits were body depth,head length,caudal peduncle depth,snout length and total length.