[ Objective ] The research aimed to discuss the toxic effects of heavy metals mercuric chloride and zinc sulfate on the embryos of Siniperca chuatsi and Hypophthalmkhthys molilrix. [Method] Under the water temperature conditions of 18 -23 X., the lowest total lethal concentration , the highest noniethal concentration and median lethal concentralion of fish embryos to two kinds of drugs were determined by using half static biological toxic test. And the toxic effects of different concentrations of mercuric chloride and zinc sulfate on the embryos of 5. chuatsi and H. molitrix were discussed. [Result] The embryos of S. chuatsi and H. mnlitrix were very sensitive to Hg2+ , the malformation rate of fmgerlings was also high, especially the lethal rate of new-hatched larva was higher. The resistance of the embryos of S. chuatsi and H. molitrix to Hg2 + had little difference. The tolerance of H. molitrix embryos to Zn2 + was obviously higher than that of S. chuatsi embryos. Using the safety concentration as the weighing standard, the toxieity of Hg2+ lo the emhryna of S. chuatsi and H. molitrix was stronger than Zn2+. [Conclusion] The research could provide references for the healthy fishery breeding and resource protection.%[目的]探讨重金属氯化汞和硫酸锌对鳜、鲢胚胎的毒性效应.[方法]在水温18 ～23℃条件下,采用半静止式生物毒性试验法,测定鱼胚胎对2种药物的最低全致死浓度、最高不致死浓度以及半致死浓度,探讨不同浓度的氯化汞、硫酸锌对鳜、鲢胚胎的毒性效应.[结果]鳜、鲢鱼的胚胎对Hg2+相当敏感,对仔鱼的致畸率也很大,特别是对刚出膜的仔鱼的致死率很高.鳜、鲢鱼的胚胎对Hg2+的毒性抵抗能力差别不大.鲢胚胎对Zn2 +的耐受能力明显高于鳜胚胎.以安全浓度为衡量标准,Hg2+和Zn2+对鳜、鲢胚胎的毒性强弱顺序为Hg2+＞ Zn2+.[结论]该研究可为渔业健康养殖和资源保护提供参考.
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