Paralytic shellfish poison (PSP) has been detected at unsafe levels on Vashon-Maury Island’s Quartermaster Harbor beaches, and the Washington State Department of Health (DOH) closed these shores to recreational shellfish harvest, as of Oct. 6. Public Health – Seattle & King County (PHSKC) has posted advisory signs at beaches.

The closure, according to county spokesperson James Apa, is of indefinite length, as it is dependent on testing. It was still in effect as of Oct. 12, county officials said.

Species of shellfish affected

The closure includes all species of shellfish except crab or shrimp. Crabmeat is not known to contain the PSP toxin, but the guts can contain unsafe levels. To be safe, clean crab thoroughly and discard the guts, also known as “butter.”

Symptoms of illness

Symptoms of PSP usually begin within 30 to 60 minutes, but sometimes hours, after eating contaminated shellfish. Symptoms are generally mild and begin with numbness or tingling of the face, arms, and legs. This is followed by headache, dizziness, nausea, and loss of muscle coordination. Sometimes a floating sensation occurs.

In cases of severe poisoning, muscle paralysis and respiratory failure occur, and in these cases, death may occur in 2 to 25 hours.

If symptoms are mild, call your health care provider or Washington Poison Center (800-222-1222), and Public Health (206-296-4774).

If symptoms are severe, call 911 or have someone take you to the emergency room immediately.

Always check before harvesting shellfish

Harvesters are advised to call the DOH Biotoxin Hotline at 1-800-562-5632 or visit the shellfish safety website before harvesting shellfish anywhere in Puget Sound, at any time.