Cu^(2+)、Zn^(2+)对罗非鱼鳃盖运动的影响

Effects of Cu^(2+) and Zn^(2+) on opercular movement in Tilapia sp.

本文研究结果表明：（1）水体中含Cu2+和Zn2+的浓度越高，鱼中毒越深，鳃盖运动振幅的增大和频率的减小就越显著。（2）Cu2+／Zn2+混合液对鳃盖运动的影响具明显的协同作用，它的致毒效应分别为单一因子的3～5倍。（3）毒性次序：5×10－6Cu2+／50×10－6Zn2+＞2．5×10－6Cu2+／25×10－6Zn2+＞5×10－6Cu2+＞50×10－6Zn2+（V／V）。（4）频繁的咳嗽反应是Zn2+中毒的主要症状，驱逐反射是Cu2+中毒的主要症状，两者均可作为单一和混合重金属离子污染的敏感生物学监测指标。

The results from the study on the effects of Cu2+,Zn2+ or their mixed liquid on opercular movement of fish are as follows: (1) The higher the Cu2+ or Zn2+ concentration, the deeper the fish was poisoned. It is quite obvious that the amplitude of opercular movement increased and decreased in frequency. (2) Apparently there is synergism from the effects of Cu2+/Zn2+mixed solution on opercular movement. The toxic efficacy is 3~5 times than that of single ion. (3) The sequence of toxicity is 5 ×10-6Cu2+/50 ×10-6Zn2+>2. 5 ×10-6Cu2+/25 × 10-6Zn2+>5 × 10-6Cu2+ >50 × 10-6Zn2+ (V/V). (4)Cough response is the main sympton of Zn2+,expulsion reflex is the symptom of Cu2+. Both cough response and expulsion reflex may be used as biological index of heavy metal pollution.