【摘要】 经济性状是对虾遗传育种的重要指标,形态参数对于经济性状的贡献率是选育参数的重要依据。为了研究斑节对虾(Penaeus monodon)表型性状间的相关性及影响体质量的因素组成,随机选取1 339尾6月龄对虾,对其形态性状(体长、头胸甲长、头胸甲高、头胸甲宽)和体质量性状5个数量性状进行测量,并应用相关分析、多元回归、通径分析、决定系数等方法讨论了形态性状对体质量性状的影响。结果表明,所测各形态性状间的相关性均达到极显著水平(P<0.01);其中体长(P=0.563)对体质量的直接影响较大,是影响体质量的主要因素。决定系数分析结果与通径分析结果一致,各表型性状对体质量的总决定系数Σd=0.925,表明所选性状是影响体质量的主要性状。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,体长、头胸甲长、头胸甲高和头胸甲宽为自变量的多元回归回归方程:Y=–22.489+0.22X1+0.191X2+0.339X3+0.296X4,为斑节对虾选育提供了理论依据。更多还原

【Abstract】 In order to study the correlation between phenotypic traits and body weight,five quantitative traits including four morphological traits(body length,carapace length,carapace width,and carapace height) and body weight of 6-month-old Penaeus monodon were measured and analyzed from 1339 randomly collected individuals by correlation analysis,multiple regression analysis,path analysis and determination coefficient analysis.The results showed that there were significant correlations(P <0.01) among the five measured traits.The body length(P=0.563) was the key effective factor,bearing predominant,direct effect and determinacy on the body weight.The trend of determination coefficient analysis was similar to that of path analysis.High total determination coefficient(Σd=0.925) between phenotypic features and body weight indicated that the selected traits were practically useful.The multiple regression equation for estimation of body weight was Y = –22.489 + 0.22X1 + 0.191X2 + 0.339X3 + 0.296X4.更多还原