A lethal shellfish warning has been issued for folks in Marin County, San Francisco and San Mateo counties, where dangerous levels of PSP were found in shellfish. The California Department of Public Health is warning people not to harvest mussels, clams and oysters along the county coasts because they may contain lethal levels of paralytic shellfish poison, or PSP.
In a recent mussel sample from the Chimney Rock sentinel station in the Point Reyes National Seashore contained levels of PSP 37 times the "alert" level.
The California Department of Public Health also issued a warning this week advising people not to eat self harvested mussels, clams or scallops from the coast of these counties.
The warnings for all three counties do not apply to commercially sold clams, mussels, scallops or oysters from approved sources, the California Department of Public Health said.