Acute toxicity of zinc to the killfish,Fundulus heteroclitus
Tóm tắt
Groups of adult mummichogs,Fundulus heteroclitus, were subjected to different concentrations of zinc as zinc chloride at 24‰ salinity, pH 8.0 and 20 C. At 192 hours, all mummichogs exposed to 43 ppm or less of zinc were alive and outwardly indistinguishable from the controls. Among these survivors there were no appreciable differences at 192 hours in zinc content of various tissues, as determined by atomic absorption spectroscopy, regardless of the initial amount of zinc in solution. All mummichogs subjected to 157 ppm or 180 ppm of zinc died between 24 and 48 hours. Dead mummichogs contained about 7 and 8 times more zinc in whole fish and in gill arch, respectively, than controls and this affords an index of zinccaused mortality for the species.
Tài liệu tham khảo
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