团头鲂5个选育群体2龄阶段生长性能比较

Comparison of growth performance among five selective breeding populations of blunt snout bream(Megalobrama amblycephala) during the second year culture

为评估团头鲂5个选育群体的配套系育种潜力,采用剪鳍标志和同池比较法对5个团头鲂选育群体(编号A^E)进行了为期12个月的2龄阶段生长性能比较。结果显示,5个选育群体2龄鱼试验末体质量为925.64~1123.86 g;5个选育群体的特定增重率为0.44~0.49%/d,绝对增重率为2.03~2.56 g/d,体质量变异系数为13.35%~22.01%,成活率为73.33%~93.00%。LSD多重比较分析表明,A群体、B群体、C群体在特定增重率、绝对增重率、体质量变异系数和成活率等方面的表现均显著(P<0.05)优于D群体和E群体。本研究结果表明A群体、B群体和C群体具备用作配套系育种亲本的优势。

To assess the potential for complete set line breeding, growth performance of five selective breed- ing populations （numbered A to E） of blunt snout bream （Megalobrama amblycephala） was compared by cut-fin marking method in the same pond for twelve months during the second year culture. The results showed that： the body weight of five selective breeding populations at the end of the experiment was 925.64-1123.86 g. The pa- rameters of growth performance in five selective breeding populations were summarized as follows： the average specific growth rate （SGR） was 0.44%/d-0.49%/d,the average absolute growth rate （AGR） was 2.03-2.56 g/d, the average variation coefficient （CV） of body weight was 13.35%-22.01%,the average survival rate （SR） was 73.33%-93.00%. According to LSD multiple comparison analysis,growth performance of population A,B and C in terms of SGR,AGR, CV and SR were significantly （P〈0.05） better than those of population D and E. This study showed that population A, B and C have the advantage to be used as parents for complete set line breeding.