Diarrhetic shellfish poisoning in Narragansett Bay |
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Authors: | Lucie Maranda Yuzuru Shimizu |
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Institution: | 1. Graduate School of Oceanography Narragansett Bay Campus, University of Rhode Island, 02882-1197, Narragansett, Rhode Island 2. Department of Pharmacognosy and Environmental Health Sciences, University of Rhode Island, 02881, Kingston, Rhode Island
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Abstract: | A two-year survey for diarrhetic shellfish poisoning (DSP) was conducted in Narragansett Bay using the mouse assay method. The suspected causative organisms,Dinophysis spp., were monitored at the same time. Only one shellfish sample, in September 1984, yielded an unequivocal positive result at a time when the dinoflagellate population was dominated byD. acuminata. False positive results were suspected in May, when the mussels appeared sexually matured, and in, the summer of 1985, at the time of an unusual massive picoplanktonic bloom. Evidence of toxin production byD. acuminata was obtained from an almost monospecific sample; we calculated that over 5.4×105 cells would be necessary to produce one mouse unit. The specificity and sensitivity of the assay method are questioned and improvements for DSP detection are suggested. |
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