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Locations of shellfish monitoring for diarrhetic shellfish toxins (DSTs) in Washington State. Colored symbols represent different concentrations of toxins at sites where regulatory closures occurred at least once from June to October 2012. Open symbols indicate sites where no closures occurred (A). SoundToxins and Olympic Region Harmful Algal Bloom (ORHAB) sampling sites that provide weekly phytoplankton abundance data as an early warning of harmful algal events are shown (B).
