Acute toxicity of cadmium against catfish Heteropneustes Fossilis (Siluriformes: Heteropneustidae) in static renewal bioassays
AbstractStatic renewal evaluation of the acute toxicity of Cadmium Chloride against the freshwater fish Heteropneustes fossilis was conducted in the laboratory. The 96h LC50 was in the low mg/l range (by international protocols). Probit-log analysis was used to determine the LC50 values at different exposure periods. The upper and lower confidence limits and slope functions were calculated. The LC50 values for Cadmium Chloride at 24, 48, 72 and 96 h are 620.34, 414.59, 384.88 and 360.50 mg/l, respectively. The upper confidence limits were 645.59, 433.27, 394.72 and 380.32 mg/l for 24, 48, 72 and 96 h and lower confidence limits were 595.33, 395.87, 374.34 and 337.55 mg/l, respectively.
Keywords/phrases: Bioassay, Cadmium, Catfish, Heavy metal, Toxicity
Ethiop. J. Biol. Sci., 7(2): 185-191, 2008
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