Paralytic Shellfish Poisoning (PSP) biotoxin is now at potentially lethal levels in Bellingham Bay mussels. PSP levels continue to rise in surrounding waters from Samish Bay to Birch Bay. The biotoxin closure has been expanded to include all beaches from Birch Point south to the Skagit County line, including all of Larrabee State Park. Diarrhetic Shellfish Poisoning biotoxin also remains at elevated levels in Bellingham Bay. Consuming molluscan shellfish - especially mussels - harvested in the affected areas can cause a potentially lethal intoxication.