锌对离体鲤鱼头呼吸的抑制作用

INHIBITORY ACTION OF ZINC ON RESPIRATION OF ISOLATED CARP'S HEAD

本工作基于化学纤维工厂废水中硫酸锌含量的严重超标而设计。采用改进的离体鱼头灌注法，以不同浓度的ＺｎＳＯ_4·７Ｈ_2Ｏ对８４个鲤鱼头进行了人工灌流，结果表明，锌的渔业水质安全下限似应以 ０００２３ｍｇ／Ｌ（我国现行规定锌的渔业水质标准为０.１ｍｇ／Ｌ）为宜。

This work was planned for the purpose of solution of the problem that the content of ZnSO_4 in the waste water from chemical fibre factory was seriously higher than the standard issued by the Goverment. In order to study the main cause that affected fish living in the Ya Lu Jiang River, 84 health carps (each carp was 0.25kg) were perfused with different concentration ZnSO_4 by the improved method of perfusing the isolated fish's head. Regression analysis was implemented for investigating the relationship between the concentration of ZnSO_4 and respiratory movement of the isolated fish's head, and a regression equation was obtained. The data of the experiment were suitable to the regression curve. When ZnSO_4 concentration is between 0.01mg/L and 0.1mg/L,the respiratory frequency became slow remarkably following the concentration becoming high;when it is between 0.1 and 1, the respiratory frequency became slow slightly. That means the inhibition of ZnSO_4. on fish's respiration becomes stronger as the concentration becomes higher. Three conclusions could be drawn from the experiment. 1. The respiratory centre of the isolated carp's head is very sensitive to Zinc and the method used is convenient, stable, and reliable and thereby can provide a physiological method to obtain data for the identification standard of fishery water quality. 2.0.0023mg/L Zinc should be the identification standard of fishery water quality since no affection on the respiratory centre was revealed. 3. different inhibition on the respiratory centre of the isolated carp's head may occur if Zinc concentration is higher than 0.05mg/L,that indicates that the Zinc standard of fishery water quality (0.1mg/L)of our country is higher than the safty limit inferior that must be harmful to fishery production.