Abstract-A comparison of an acute 1-h Ceriodaphnia dubia toxicity test (CerioFAST) with Microtox and the standard acute 48-h C. dubia acute toxicity test was undertaken to determine the toxicity of a variety of industrial effluents. CerioFAST is based on suppression of feeding activity of C. dubia in the presence of toxicants and consists of a 1-h-exposure period to a given toxicant followed by a 20-min-feeding period using fluorescent yeast cells. Twenty-eight industrial effluent samples, collected from northern and central Florida, were tested and compared using the CerioFAST and the standard 48-h C. dubia acute toxicity test. The results of the CerioFAST assay were well correlated with the standard 48-h C. dubia test (r 2 ϭ 0.98). Therefore, CerioFAST is useful as a rapid-screening test or range-finding test for assessing the toxicity of environmental samples.
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