尼罗罗非鱼选育三代效果评价

报道了以尼罗罗非鱼吉富品系为基础群体,使用混合选择方法进行选育所产生的选育系F3的选育效果及其评价。在青岛、广州及蚌埠三个试验场,F3的日增重率分别比对照系的日增重率提高14．1％、7．5％和80．8％,平均每代选育效应为4．7％、2．5％和26．9％。选育系体侧、尾部条纹更清晰,形态特征更加符合尼罗罗非鱼标准,体重变异系数显著降低,表明有较大纯化。尼罗罗非鱼在三个试验点的选育都有生长的效果,但三地差异较大,尤其是蚌埠试验场选育系日增重率和选育效应比其它2个试验场的高出甚多,这启示我们在选育过程中要重视遗传因子－环境因子的互作的研究。

Third generation evaluation of Nile tilapia breeding lines

At three experimental stations, Qingdao, Guangzhou and Bengbu, based on GIFT strain of Nile tilapia, Oreochromis niloticus and mass selection method, F 3 was produced and evaluated. In three experimental stations, the daily growth rate of F 3 was 14.1%, 7.5% and 80.8% higher than that of control line respectively, the average selected response per generation was 4.7%, 2.5% and 26.9% respectively. In selected line, morphology traits, such as strips on body side and caudal fin were more clear and typical than control line, and the variation coefficient of body weight was reduced. These indicated that the selected line has been more purified. The value of growth rate and selection respones from Bengbu station were much higher than those of other two experimental stations, it could relate to the more alternation of experimental environment in Bengbu, which indicated that a high attention to gene environment interaction should be paid in further selection study.