大黄鱼选育子二代生长性状研究

通过对选育和未选育2个群体大黄鱼（Larimichthys crocea）繁育得到的子代的卵径、油球径和口径进行测量，以及对其子代养殖过程中的生长性状进行测量比较，分析选育效果。结果显示，选育大黄鱼子代（XY-F2）和未经选育大黄鱼子代（HB-F1）平均卵径、平均油球径和平均口径之间差异不显著（P〉0.05）。拟合1~10月龄XY-F2和HB-F1的体长（x）、体质量（y）的生长曲线及体长（x）与体质量（y）的关系表明，两群体间体长（x）与体质量（y）的关系存在差异；XY-F2在体长（x）和体质量（y）的生长在后期高于HB-F1。分析其数量性状，选育子一代（XY-F1）2龄鱼体长、体质量现实遗传力分别为0.26、0.18，而XY-F2的体长、体质量现实遗传力分别为0.029、0.134。结果说明选育具有一定的作用，今后选育应该结合家系选择和家系内选择进行。

Growth traits research of the breeding group sub 2 generation of large yellow croaker (Larimichthys crocea)

We measured the egg diameter, oil globule diameter and caliber of offspring of two groups of large yellow croaker （Larimichthys crocea）, one breeding group and the other casual, and surveyed these offspring’s growth traits, based on which the breeding effect was analyzed. The results show that there is no significant difference （P〉0.05） between breeding offspring（XY-F2）and not breeding（HB-F1）offspring of large yellow croaker in average egg diameter, oil ball diameter and caliber diameter. The curve of body length and body weight and the curve of body weight and age of moon are fitted for the two groups, indicating that body length and weight has a difference in each group, and that body length and weight of XY-F2 are higher than HB-F1 in the later stage. Body length and realized heritability of body weight of 2 years old breeding sub 1 generation （XY-F1） are 0.26, 0.18, respectively, while of XY-F2 are 0.029, 0.134, indicating that breeding promotes large yellow croaker cultivation. The results suggest combining family selection and within-family selection for breeding.