Abstract
Abstract For the first time since 1990 the Limfjord, which is the main Danish production area for mussels, was partly closed for a period of 14 wk during autumn 2006 because of presence of DSP toxins in blue mussels. The causative organism was Dinophysis acuminata. Only the okadaic acid (OA) and OA esters were observed. The maximum concentration level of approximately 600–700 μg OA equivalents kg−1 was reached at approximately 5,000 cells l−1 of D. acuminata. A further increase in the concentration of D. acuminata did not lead to any further increase in the concentration of OA in the blue mussels. The temporal development in the concentration of D. acuminata cells in the water was in good accordance with the development in the content of OA in blue mussels on a weekly basis. The maximum concentration of D. acuminata during the bloom was 14,000 cells l−1 and the maximum concentration of total OA equivalents in the raw blue mussels was 706 μg/kg. Single cell toxicity measurements showed a mean content of 31...
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