Shellfish Harvesting Closure in Dyes Inlet All Shellfish Species Closure Due to High Biotoxin Concentrations

BREMERTON, WA—Marine biotoxins that cause paralytic shellfish poisoning (PSP) have been detected in shellfish samples from Silverdale Waterfront Park located in Silverdale at the head of Dyes Inlet in Kitsap County. As a result, the Washington State Department of Health and the Kitsap Public Health District have closed recreational shellfish harvesting for all species of clams, oysters, and mussels in Dyes Inlet. The closure area includes all of Dyes Inlet, Oyster Bay, and Ostrich Bay, including all other bays and inlets in this area.

Samples of mussels collected on Oct. 21 from Silverdale Waterfront Park contained PSP toxin concentrations of 94 micrograms per 100 grams of shellfish tissue. Shorelines are closed to harvesting when toxin levels exceed 80 micrograms per 100 grams of tissue.

Existing biotoxin closures for all species all shellfish remains in effect for all of Port Madison Bay and for butter clams and varnish clams only on Kitsap County’s eastern shoreline from Point No Point in Hansville south to the Pierce County line, including all shorelines on Bainbridge Island and Blake Island.

Warning signs have been posted at public beaches alerting people not to collect shellfish from the closure areas.

Shrimp and crab are not included in this closure, but crabs should be cleaned prior to cooking, and the “crab butter” should be discarded. Shellfish harvested commercially that are available in stores and restaurants are tested for toxins prior to distribution, and are safe to eat.

Marine biotoxins are not destroyed by cooking or freezing and can be life-threatening. People can become ill from eating shellfish contaminated with the naturally occurring marine algae that contains toxins that are harmful to humans. Symptoms of PSP can appear within minutes or hours and usually begin with tingling lips and tongue, moving to the hands and feet, followed by difficulty breathing and potentially death. Anyone experiencing these symptoms should contact a health care provider. For extreme reactions, call 911.

In most cases, the algae that contain the toxins cannot be seen and must be detected using laboratory testing. Kitsap Public Health will continue to monitor shellfish at Kitsap County beaches, and notify the public if the levels of PSP toxin become unsafe in other areas.

For current shellfish closures within Kitsap County, call our hotline number at 1-800-2BE-WELL, or visit us online at For closures in other areas of Washington, call the Washington State Department of Health’s Shellfish Safety Hotline at 1-800-562-5632, or visit them online at


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