牙鲆主要生长性状与体质量的灰色关联度分析

采用灰色关联分析方法对牙鲆(Paralichthys olivaceus)10个选育家系的9个生长性状与体质量的关联度进行分析和评价。首先对体质量与生长性况进行数列无量纲化处理,计算出每个生长性状与体质量的关联系数和关联度,根据灰色关联度构建两两比较判断矩阵定量分析各生长性状对体质量的影响度。结果显示,每个生长性状与体质量的关联度由大到小依次为:全长(0.875 8)、体长(0.859 3)、尾柄高(0.830 7)、躯干长(0.827 7)、头长(0.803 5)、尾长(0.781 2)、体高(0.740 2)、吻长(0.665 7)和尾柄长(0.654 0)。体质量的主控因素为:全长、体长、尾柄高和躯干长4个性状,影响度分别为:28.51%、21.62%、16.41%和11.69%,四者的影响度总和达到78.23%。分析表明,与体质量关联度最大的分别是全长、体长、尾柄高和躯干长,且它们对体质量的影响度最高,可以将其作为培育高产牙鲆的重要评价指标,以提高选择效率。本研究旨在为制定理想的牙鲆选育目标、提高育种效率提供理论依据,同时拓展灰色关联度方法在水产动物育种研究中的应用。

Grey relational analysis between main growth traits and body weight in Japanese flounder (Paralichthys olivaceus)

Grey relational analysis was considered to be a useful method to define the relationship among the agronomic characters and yield of different crop populations. But for aquatic animal, there were only few reports that evaluated the relationship among multiple growth traits with the method. To broaden the application of grey relational analysis in fish species, Japanese flounder () was used as targeted animal to demonstrate the statistical efficiency of this method introduced here. This flounder is an important marine fish species and widely cultured in China, Korea and Japan because of its fast growth and delicious taste. In this study, 10 selective and breeding families were produced by crossing wild individuals of Japanese flounder. A total of 9 growth traits and body weight were measured in these families. Grey relational analysis method was used to examine the relationship between main growth traits and body weight in Japanese flounder. The relational coefficients and degrees between each weight were determined according to grey system theory. Based on grey relational degree, a matrix compared with paired comparison was constructed to quantitatively analyze the impact of each growth trait on body weight. The grey relational degrees between each growth trait and body weight were calculated and ranked as follows, total length depth (0.830 7), trunk length (0.827 7), head length (0.803 5), tail length (0.781 2), body depth (0.740 2), snout length (0.665 7), and length (0.654 0). The main controlling factors included total length, body length, peduncle, their affective degrees were as follows, 28.51%, 21.62%, 16.41% and 11.69%, respectively, and the total effective degree reached 78.23%. The analyzed results showed that the values of total length, body length, depth and trunk length had the closest relationship with body weight and these traits significantly influenced body weight. So the four growth traits could be used as important evaluation factors for the Japanese flounder breeding on high yield to improve the selection efficiency. This study provide scientific basis for the Japanese flounder breeding selection on growth traits