Cd^(2+)、Hg^(2+)、Pb^(2+)抑制罗非鱼EOG反应的研究

Inhibition of Cd 2+ ,Hg 2+ and Pb 2+ on EOG responses of Tilapia sp.

将不同浓度Ｃｄ２＋、Ｈｇ２＋、Ｐｂ２＋液分别灌注罗非鱼嗅觉器官，研究其对ＥＯＧ反应的影响。结果表明，这３种离子对ＥＯＧ反应均呈抑制效应，抑制作用的大小与金属离子的种类及浓度有关，Ｃｄ２＋、Ｈｇ２＋、Ｐｂ２＋有效ＩＣ５０分别为３３．９１、６７．７３、１９１．４４μｇ／Ｌ；毒性顺序为：Ｃｄ２＋＞Ｈｇ２＋＞Ｐｂ２＋。

Solutions of Cd 2+ ,Hg 2+ and Pb 2+ with different concentrations were poured into olfactory organs of Tilapia sp.Their electro-olfactogram(EOG) responses to the 3 ions were recorded.The EOG responses declined during the fish's exposure to Cd 2+ ,Hg 2+ and Pb 2+ solutions. The inhibitory degree was relative to the kind of metal and its concentration.The effective IC 50 of the 3 kinds of ions were 33.9,67.73 and 191.44 μg /L, respectively. The sequence of toxicty was Cd 2+ >Hg 2+ >Pb 2+ .