马口鱼形态特征的两性异形

摘要 运用传统形态学方法分析了马口鱼的两性异形。结果表明，马口鱼雌鱼、雄鱼除体厚外，其他性状均为雄性大于雌性，且具有显著性差异。利用主成分分析提取了3个主成分，对总变异的累积贡献率为57.92%。以逐步判别分析方法建立了雌鱼、雄鱼的判别公式，判别准确率分别为73.3%～80.0%（P1）、73.3%～76.7%（P2），综合判别率为76.67%。

Abstract Based on traditional morphology method，the sexual dimorphism of Opsariichthys bidens was analyzed. The results showed that except for the body thickness of male and female Opsariichthys bidens，other traits of male were greater than female′s，and had significant difference.Through principal component analysis，three principal components were established，the cumulative contributory ration being 57.92%.Th...