The acute toxicities of tow strains of Phaeocystis globosa scherffel isolated respectively from the coastal waters of Hong Kong (HK) in June 1998 and Shantou (ST) of Guangdong Province in October 1997 were studied under laboratory conditions. The results showed that two strains were pernicious to Artemia sinica. 1) Media Lethal concentration (MLC) for HK strain of logarithmic phase was 2.9×105 cell·mL-1.Median Lethal Time (MLT) was 20.91 hours. 2) MLC was 9.89×106 cell·mL-1 for ST strain of decline phase, and MLT was 26.62 hours. 3) The cell-free liquids of tow stains of Phaeocystis globosa scherffel were also pernicious to Artemia sinica, but the adverse effect of them were not so remarkable as whole cells culture medias. MLT was 26.56 hours for cell-free liquids of HK strain, and 28.02 hours for ST strain. MLC for them respectively were 7.1×105 cell·mL-1 and 1.457×107 cell·mL-1.The experimental results showed that the toxicities of cell and cell-free liquids of HK strain were more remarkable than ST strain, and the toxicities of cell liquids were more acute than cell-free liquids.
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