淡水黑鲷表型形态性状与体重之间的关系

来源 :广东农业科学 | 被引量 : 0次 | 上传用户:pj00000pj
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随机选取63尾淡水黑鲷,分别测量全长、体长、体厚、体高、口裂、吻长、头高、头长、眼间距、眼径、眼后头长、躯干长、尾柄高、尾柄长和体重共15个形态学指标,并分析各形态性状与体重之间的关系,通过相关分析并结合通径分析的方法计算以其14个形态性状为自变量,体重为依变量的决定系数、通径系数、相关系数以及复相关指数。结果表明,淡水黑鲷的14个形态性状和体重之间的相关系数均达到了极显著水平;头高、体厚、尾柄高和躯干长为影响淡水黑鲷体重的四大主要形态性状,其中对体重直接影响最大的是头高(P2=0.360),这4个性状对体重的相关指数R2=0.915,通过逐步回归法建立的回归方程为y=-432.346+40.705x1+25.396x2+55.718x3+28.862x4(x1为头高,x2为躯干长,x3为尾柄高,x4为体厚),为淡水黑鲷育种提供了理论依据。
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