Abstract：Acute toxicity of heavy metals Cd2+ and Hg2+ prepared from cadmium chloride and mercury chloride to scalloped spiny lobster Panulirus homarus with body weight of 49.10—52.10 g was tested in a 0.5 m3 round glass steel bucket at water temperature of 28.0—29.0 °C by a toxicological method. The median lethal concentration (LC50) and safety concentrations (SC) of Cd2+ and Hg2+ were obtained by linear interpolation based on the relationship between mortality rates of shrimp and heavy metal doses. The LC50 value of Cd2+ in scalloped spiny lobster was found to be 2.5169 mg/L at 24 h, 1.3378 mg/L at 48 h, 1.0445 mg/L at 72 h and 0.9500 mg/L at 96 h, with the corresponding SC level of 0.0095 mg/L. The LC50 of Hg2+ in spiny lobster were 0.0560 mg/L at 24 h, 0.0333 mg/L at 48 h, 0.0246 mg/L at 72 and 0.0227 mg/L at 96 h, with SC of 0.000227 mg/L, indicating that metal Hg2+ was more toxic to scalloped spiny lobster than that of metal Cd2+.
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2020, Vol. 39 
