Algae bloom - from the local newspaper:
Biotoxin closes shellfish harvest throughout Skagit County
Due to the growing presence of a marine biotoxin, shellfish harvest is closed throughout Skagit County.
Skagit County Public Health on Thursday announced a closure of all recreational shellfish harvest in the county due to potentially dangerous levels of the marine biotoxin that can cause paralytic shellfish poisoning found in shellfish samples taken from area beaches.
The biotoxin is produced by a type of algae found in marine water and that tends to bloom in the region during the summer.
A seasonal problem and not linked to any pollution or human causes.
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