60个家系吉富品系罗非鱼初期阶段的生长比较

本文对这60个家系的吉富罗非鱼(Oreochromis niloticus)在生长初期阶段的3个多月时间内的生长情况进行了比较分析,结果显示:经过3个多月的培育,60个家系共1831尾吉富罗非鱼的总体平均体重为102.4±38.9g。第59号家系的平均体重最大,为178.0±40.0g;第9号家系的平均体重最小,为64.1±18.6g。最大个体出现在第59号家系中,为271.7g,最小个体出现在第20号家系中,为22.0g。从家系水平上看,生长速度相差2倍,从个体水平上看,最大个体的体重是最小个体的12倍多。表明吉富罗非鱼各家系及个体间的生长速度存在较大差异,既有进行选育的基础,也有进行长期选育的必要。

Comparison of Growth among 60 Families GIFT Strain Tilapia at Initial Stage

In this paper,the growth during first 3~4 months was compared and analyzed among 60 families.The results showed the average body weight of total 1831 individuals of 60 families was 102.4±38.9 g.The body weight of No.59 family was the largest with the value of 178.0±40.0 g and No.9 family had the smallest value of 64.1±18.6 g of body weight.The largest individual was in No.59 family with the body weight of 271.7 g and the smallest was in No.20 family with the body weight of 22.0 g.From the family level,there was twice difference in growth,while from individual level,the body weight of the largest individual was 12-odd times than that of smallest individual.It indicated there was large difference in growth rate among different families and individuals.The long-term selection basic as well as necessity existed in GIFT.