不同群体山女鳟及其杂交F1的生产性能比较

本文系统研究了我国引进的两个山女鳟（Oncorhynchusmasoumazou）群体及其杂交F1代的生产性能。结果表明，（1）两个杂交组合的早期生产性能，如授精率、发眼率和孵化率等不存在显著优势，自交组合BH08♀×BH08♂的最终成活率为63．37％，远低于其他三组的成活率（P〈0．01）；（2）378d的生长对比试验表明，杂交组合与自交组合的体质量、绝对增重率、特定生长率和肥满度等存在一定差异，养殖时间对这些指标的影响达到极显著水平（P〈0．01），但组间差异仅为显著水平（P〈0．05）或没有差异（P〉0．05）；（3）378d的生长对比试验结束时，两个杂交组合均表现出一定的杂种优势。方差分析表明，不同生长阶段对杂交组合杂种优势率的影响极显著（P〈0．01），不同组合间的杂种优势率也存在极显著差异（P〈0．01）。

Production Performance of Different Populations of Rainbow Trout Oncorhynchus masou masou and Their Cross-breeding F1

In this paper, the production performance were studied in two populations of rainbow trout Oncorhynchus masou masou and their cross-breeding F1. The results showed that firstly there were no significant differences in production performance including fertil- ization, eyed embryonic rate, and hatching success between the cross-breeding F1 （BH 96 ♀ × BH 08♂ and BH 08 ♀× BH 96♂ ） and the controls （BH 96 ♀ × BH 96♂ and BH 08 ♀× BH 08♂ （P〉0.05）, with survival rate of only 63.3% in BH 08 ♀× BH 08 ♂, very significantly lower than in the others （P〈0.01）. Secondly a 378-day experiment showed that among the groups, there were some dif- ferences in the body weight, and absolute weight gain, specific growth rate and condition factors, especially culture-time showing sig- nificant effects （P〈0.05）, but at the same culture-phase there was no significant difference （P〉0.05）.Thirdly after a 378-day experi- ment the cross-breeding F1 appeared some growth heterosis. The analysis of variance showed that the heterosis difference was affected not only by culture-time, but also among different groups （P〈0.01）.