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The seasonal variation in diarrhetic shellfish poisoning (DSP)-type toxins was followed in the epibiotic community and in shellfish between 41° and 44°N in coastal waters of the northwest Atlantic during a 2-year period. Low levels of okadaic-acid equivalents were detected at all stations in the <90μm fraction of the collected epibiota as measured by the protein phosphatase inhibition assay, but...