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

Chai Minjuan Chen Xuelei (Department of Oceanogrophy,Xamen University, 361005)  
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+ .
【Fund】: 福建省自然科学基金 国家自然科学基金
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