尼罗罗非鱼选育一代耐盐碱和生长性能评估

Evaluation on salinity-alkalinity tolerance and growth of the first selection generation of Oreochromis niloticus

以尼罗罗非鱼耐盐碱选育一代为材料,开展幼鱼慢性致死试验和鱼种不同盐碱环境(S0A0、S10A0、S10A2、S10A4、S10A6)中生长试验,评估选育一代的盐、碱耐受性能和生长性能。慢性致死试验结果表明,选育一代山东、上海、河北品系的半致死盐度分别为53.95(±1.29)、53.36(±1.53)、56.25(±2.12)g/L,半致死碱度分别为19.18(±1.24)、18.73(±1.20)、20.05(±1.37)g/L。生长试验结果表明,随着盐碱浓度的增加,选育一代的日增重率表现为下降趋势,S0A0组显著大于其他各组,S10A0、S10A2组间无显著差异,但显著大于S10A4、S10A6组;除S10A6组中山东品系日增重率大于上海、河北品系外,各盐碱组中3个品系间无显著差异。

In order to assess the tolerance and growth performance of the first selection generation of Nile tilapia in salinity-alkalinity waters,chronic lethal experiment was carried out in juvenile fish and the average growth rates of young fish in different salinity-alkalinity waters（S0A0,S10A0,S10A2,S10A4,S10A6）were compared during 60 days culture experiment. The results showed that the median lethal salinity was 53.95（±1.29）,53.36（±1.53）,56.25（±2.12）g/L,the median lethal alkalinity was 19.18（±1.24）,18.73（±1.20）,20.05（±1.37）g/L for Shanghai,Shandong,Hebei strain,respectively. The results of growth performance showed that the average growth rate significantly decreased with the elevation of salinity-alkalinity,there was no significant difference between S10A0 and S10A2 groups,but significantly higher than that in S10A4,S10A6 groups. There was no significant difference among different strains within the same treatment,except that Shandong strain showed a relatively higher growth rate than Shanghai,Hebei strains in S10A6.