摘要
在水温20℃,pH=7.1,24 h不断充氧的条件下,观察记录昆明裂腹鱼幼鱼在不同盐浓度下的生活状态,测定其对盐度的耐受性。试验结果表明,24 h、48 h、72 h和96 h的半致死浓度(LC50)分别为15.2399 g/L、12.8126 g/L、12.2689 g/L、11.8187 g/L,两个级别的安全浓度(SC)分别为1.1819 g/L和2.7169 g/L。半致死浓度随时间的增加而减小,说明其对盐度的抵御力随生活在一定盐溶液时间增加而减弱。昆明裂腹鱼幼鱼在死亡前出现急游、游向水面、活动减弱、身体失衡、翻白现象,死亡后体表分泌大量粘液,口角、鱼鳍有充血现象。
The living conditions of Schizothorax grahami juveniles at different salinity were recorded under the condition of 20℃, pH7.1 and a 24-hour non-stop aeration with oxygen. The tolerance of Schizothorax grahami juveniles to salt concentration was measured. The results showed that the median lethal concentrations （LC50） after 24 hours, 48 hours, 72 hours and 96 hours post treatment were 15. 2399 g/L, 12. 8126 g/L, 12. 2689 g/L, 11. 8187 g/L, respectively. And the safe concentrations （SC） were found to be 1.1 819 g/L and 2.7169 g/L. The decreased LC50 indicated that the resistance of juveniles to salt was impaired after living in salt environment over time. The dying juveniles showed symptoms of anxious swimming, swimming towards the surface, reduced activity, losing balance and belly-up. After death, a large amount of mucus was secreted on the body surface, and congestion was observed at mouth corner and fins.
出处
《四川动物》
CSCD
北大核心
2014年第3期430-433,共4页
Sichuan Journal of Zoology
基金
贵州省科技厅农业攻关计划项目(黔科合NY字[2011]3070号)
