牙鲆体质量与形态性状的异速生长分析

为分析牙鲆（Paralichthys olivaceus）体质量与形态性状之间异速生长的遗传规律，通过人工受精的方法建立牙鲆19个全同胞家系，测量了牙鲆不同日龄的体质量和形态性状。采用逐步回归方法建立最优联合异速生长模型，将此模型镶嵌到体质量动物模型的每个遗传和环境效应中，进一步分析对多个形态性状异速生长遗传规律。静态异速生长分析表明：体质量与全长之间存在最大异速生长指数（1.415 5），表现为正异速生长，剩余形态性状与体质量之间的异速生长指数为0.061 5~0.718 0，皆表现为负异速生长。全长与尾柄高之间异速生长指数的正遗传相关最大（0.907 8）；全长与尾柄长之间的负遗传相关最大（0.946 8）。不同模型通过统计标准比较，确定模型Ⅰ为进行牙鲆动态异速生长分析的最优随机回归模型。

Allometric analysis of body weight and morphological traits for Japanese flounder(Paralichthys olivaceus)

To analyze the genetic rule of allometry between body weight and morphological traits for Japanese flounder (Paralichthys olivaceus), we established 19 full-sib families by artificial insemination to observe their body weights and morphological traits at different days of age. We constructed the optimal joint allometry model by stepwise regression method which was then nested into the fixed and genetic effects of animal model for body weight. Furthermore, we analyzed the genetic rules of allometry for multiple morphological traits. The allometric index between body weight and total length presented positive allometry with maximum value of 1.415 5. The allometric index between residual morphological traits and body weight ranged from 0.061 5 to 0.718 0, showing negative allometry. The maximum positive genetic correlation of allometric index between total length and caudal peduncle depth reached 0.907 8, while the highest negative genetic correlation existed between total length and caudal peduncle length (0.946 8). Comparing different models by the statistic criteria, ModelⅠis the optimal regression model for dynamic allometric analysis.