海洋科学2011，Vol.35Issue(12)：48-55,8.
水温和余氯对黑棘鲷仔鱼存活的影响
Effects of temperature and residual chlorine on the survival of black porgy Acanthopagrus schlegelii larvae
摘要
Abstract
The lenitic test method was used to analyze the effects of increased water temperature and residual chlorine resulted from power plants thermal drainage on the survival of Acanthopagrus schlegelii larvae. Four different water temperatures were set as 18, 22, 26 and 30℃, and six different gradients of residual chlorine concentration were set as 0.025, 0.05, 0.1, 0.2, 0.4 and 0.8 mg/L in triplicate. At the same time, filtered seawater was taken as the control. The sac-fry stage larvae were used and test was terminated at 96 h. The bioassay results showed that there is a significant lethal effect on black porgy larvae at 30℃. The lethal rate was 23.4% at 24 h and fast arose to 98% at 48 h. Whereas the lethal rate of group at 18, 22 and 26℃ were all lower than 10%. The half maximal effective concentration after exposure for 24 h （24 h-LC50） at 18, 22, 26 and 30℃ were 0.816, 0.460, 0.433 and 0.319 mg/L respectively. The data indicated temperature can enhance the lethal effect of residual chlorine on the survival of black porgy larvae, and LC50 value significantly decreased with increased time. The half maximal effective concentration after exposure for 96 h （96 h-LC50） at 18, 22,26 and 30℃ were 0.242, 0.211, 0.140 and lower than 0.025 mg/L respectively. We used generalized additive model to analysis the relation between lethal rate and factors including temperature, residual chlorine, exposure time. The results showed that the toxicity significantly enhanced when the temperature was higher than 26℃, or the concentration of residual chlorine was higher than 0.2 mg/L, or exposure time of larvae to residual chlorine was longer than 48 h. The univariate analysis results indicated that the lethal rate was significantly affected by temperature, residual chlorine and exposure time. Furthermore, there is significant influence between temperature and residual chlorine, as well as residual chlorine and exposure time （P〈0.05）.关键词
黑棘鲷（Acanthopagrus/schlegelii）/余氯/水温/广义相加模型/双因素方差分析Key words
Acanthopagrus schlegelii temperature residual chlorine generalized additive model univariate analysis分类
资源环境引用本文复制引用
晁敏,王云龙,沈新强..水温和余氯对黑棘鲷仔鱼存活的影响[J].海洋科学,2011,35(12):48-55,8.基金项目
国家重点基础研究发展计划课题 （）
中央级公益性科研院所基本科研业务费专项资金资助项目 （）
