There is an apparent global spreading and increase in frequency of harmful and toxic phytoplankton blooms. These blooms are no longer limited to dinoflagellates and the list of highly toxic forms is growing. Filter feeding bivalves are no longer the only organisms causing shellfish poisoning. Gastropods and crustaceans can become toxic as well. The types of poisoning, the major species of microalgae involved, and the geographical distribution are reviewed.
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