2个大黄鱼群体选育世代F_2生长性状研究

Study on the Growth Trait of the Second Generation for Two Selective Breeding Populations of Larimichthys crocea

对2个选育群体（XY2012-JC-F2和XY2012-XP-F2）和未选育群体（YS2012-F1）的大黄鱼（Larimichthys crocea）子代养殖过程中的生长性状进行测量,比较其选育效果。结果显示,拟合4-13月龄选育群体F2代和未经选育F1代体重与体长的关系表明,3个群体间存在差异;2个选育群体在后期生长高于未选育群体;分析其体长和体重参数,10-13月龄XY2012-JC-F2体长现实遗传力为0.228~0.364、体重现实遗传力为0.131~0.243,XY2012-XP-F2体长现实遗传力为0.193~0.265、体重现实遗传力为0.126~0.134;体长和体重的相关系数在0.857~0.981,13月龄的相关系数最大达0.997,说明选育作用明显,应结合家系选择和家系内选择进行。

By comparing the growth trait of the offspring of three breeding populations of Larimichthys crocea, the second generation of two selective breeding populations ( XY2012-JC-F2 , XY2012-XP-F2 ) and the first generation of the wild breeding population ( YS2012-F1 ) , the breeding effects were analyzed .The results showed that the cor-relations of body length ( L) and weight ( W) for F2 and F1 were different based on the measurement results which fitting 4-13 month-old Larimichthys crocea.Growth rate of the selective breeding were higher than the wild popula-tion breeding at the later stage .Analysis of the body length and weight showed that realized heritability of body length for 10 to 13 months of XY2012-JC-F2 was 0.228 -0.364 , realized heritability of weight was 0.131 -0.243;and for XY2012-XP-F2 , realized heritability of body length and weight were 0.193-0.265 and 0.126-0.134,respectively.The correlation coefficient of body length and weight was 0.857-0.981, the maximum corre-lation coefficient of body length and full length for 13 month-old Larimichthys crocea was 0.997.Results indicated that selective breeding had a certain role in the process of breeding .It was also suggested that family selection and within-family selection should be combined in the future breeding .