研究不同生长时期大黄鱼Pseudosciaena crocea形态性状对体重的影响效果, 分别测定了1704尾13月龄和596尾20月龄闽—粤东族大黄鱼的全长(x1)、体长(x2)、体高 (x3)和体重(y), 计算相关系数, 采用通径分析方法计算了以体重(y)为依变量、其他性状为自变量的通径系数和决定系数。结果表明, 在两个不同生长时期, 全长、体长、体高和体重4个性状两两之间的相关系数在0. 800—0.977之间, 均达到极显著水平(P<0.01); 在13月龄, 体高对体重的直接影响(0.522)最大, 其次为体长(0.445), 全长对体重的直接影响不显著(P>0.05)。在20月龄, 体高对体重的直接影响(0.394)最大, 其次为体长(0.328)、全长(0.271), 各性状对体重的直接影响均达到极显著水平 (P<0.01)。研究结果表明在不同生长时期, 各形态性状对体重的直接影响是不同的, 早期选种(13月龄)时要注意体高和体长的挑选, 而在晚些时候(20月龄)选种, 对体高、体长和全长均要考虑, 才能够保证选择效果。

 In order to study the effects of morphometric traits on body weight in large yellow croaker Pseudosciaena crocea at different stage, 1704 13-month-old individuals and 596 20-month-old individuals from the Min-yue Dong Tribe were sampled for measuring the metric traits, including the total length (x1), body length (x2), body height (x3), and body weight (y). The data were used in correlation analysis and path analysis. The results showed that the Pearson correlations between every two metric traits ranged from 0.800 to 0.977, and all reached significance level (P<0.01) at these two stages. At the 13-month-old stage, the trait with the strongest direct effect on body weight was the body height (0.522), then the body length (0.445); the direct effect of total length is not significant (P>0.05). At the 20-month-old stage, the trait with the strongest direct effect on body weight was also body height (0.394), then the body length (0.328), the total length (0.271), all reaching the significance level (P<0.01). The path analysis at the two stages showed that the effect of morphometric traits on body weight was different at different stage. For selection at the 13-month-old stage, we should keep our eyes on body height and body length. At a later stage (20-month-old stage), however, the body height, body length, total length should be considered.