摘要： 以自行配组获得的尼萨F₂家系与混合后代为材料,比较了不同交配方式后代幼鱼的耐盐性能、不同盐度下生长差异。结果显示,尼萨F₂家系与混合后代的平均存活时间(MST)、50%存活时间(ST₅₀)、96h半致死盐度(MLS-96)均显著高于对照组尼罗罗非鱼。除家系2显著高于混合后代外,各家系的耐盐指标MST、ST₅₀和MLS-96与混合后代间无显著差异(P>0.05)。除0g⁄L下家系5的日均增重率显著高于混合后代外,同一盐度(15,20,25g⁄L)下,各家系的日均增重率与混合后代间均无显著差异(P>0.05),尼萨F₂体重变异系数在25g⁄L盐度下表现最低。研究结果为尼萨杂交育种与生产利用提供了基础资料。

关键词: 尼萨F₂, 家系, 混合后代, 耐盐, 生长

Abstract: F₂ family offsprings and mixed group were obtained by paired and mixed mating the hybrid F, individuals of Oreochromas ualotacus × Sarotherodou melauotherou a,respectively. The salt tolerance and growth under different salinities ( 0,15,20,25 g/L) of juvenile fishes from two mating modes were compared. The results showed that MST, STS,MLS6 of 0. uiloticus×S. melauotherou a Fz were higher than that of the control group 0. ualotacus(P<0.05).No significant differences in MST, STS。 and MLS}6 indexes were observed between the family offsprings and mixed group ( P>0.05)except for the family 2. Under the same salinity conditions,there warn’t significant difffernces in the average growth rate between the family offsprings and mixed group (P>0.05) with a exception of family 5 in 0 g/L senility, uiloticus × S. melauotherou a Fz exhibited the lowest weight toefficient of variation at 25 g/L senility. The results provided some basic data for hybrization and utilization of 0.uiloticus × S. melauotherou.

Key words: Oreochromas nilotacus ♀ ×, Sarotherodou melauotherou ♂ F₂, Family offsprings, Mixed group, Salt tolerance, Growth

中图分类号: 

• S917.01