General Information

Event name: US-07-023
Nature of the harmful event:
Seafood toxins
Event directly affected:
Toxicity detected: Yes (Approximate range: 105 micrograms PSP toxin at Birch Bay)
Associated syndrome: ASP , PSP
Unexplained toxicity: No
Species implicated in toxin transmission (transvector): PSP = Blue Mussels, Manila Clams and Pacific Oysters. ASP = Blue and California Mussels
Report the outcome of a monitoring programme: Yes (WA Dept. of Health, office of Shellfish and Water Protection, Marine Biotoxin Monitoring Program)
Event occurred before in this location: Yes (Most of the inlets of North Puget Sound have had previous PSP closures. Penn Cove and Holmes Harbor had ASP blooms in 2005)
Individuals to contact: COX, Frank

Location & Date

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Location: Latitude: , Longitude:
General location information: North Puget Sound, Washington, Pacific Northwest
HAB Area code(s): US-24
Additional location information: PSP=Drayton Harbor, a North Puget Sound area located at the Canadian border and Birch Bay in Whatcom County. ASP=Penn Cove and Holmes Harbor on Whidbey Island in Island County
Bloom event dates (yyyy/mm/dd):
Quarantine levels dates (yyyy/mm/dd): First detection: 2007-03-20, End: 2007-06-12
Additional date-related information: Recreational shellfish PSP closures: Whatcom County - Drayton Harbor Closure - 3/20--6/12, Birch Bay 4/9--6/12, All Whatcom Co. 5/30--6/12. No commercial or recreational closures occurred as a result of the ASP bloom.


Causative organism known: Yes
Causative Species/Genus: Alexandrium catenella ( cells/L)
Pseudo-nitzschia sp. ( cells/L)
Co-Ocurring Species/Genus:
Chlorophyll concentration, if known: µg/l
Additional bloom information:
Event-related bibliography:

Environmental Conditions

Weather: Turbidity (NTU): Wind direction:
Stratified water: Oxygen content (nL/L): Wind velocity:
Temperature (°C): Oxygen saturation %: Current Direction:
Sechhi disk (m): Salinity: Current Velocity: 0
Nutrient information:
Temperature Range During Event: Max: °C, Min: °C
Salinity Range During Event:
Bloom location in the water column:
Growth Comments
Additional Environmental information:

Toxin Assay Information

Species containing the toxin Toxin type Toxin details Max. concentration Assay type
Blue Mussels - PSP Saxitoxins See below Bioassay-Mouse
Blue Mussels - ASP Domoic Acid " LC
Kit used: No Type of kit used:
Additional information: Max Concentration: Blue Mussels - PSP: 403 micrograms/100 grams shellfish tissue on 5/29/07 at Birch Bay Blue Mussels - ASP: 5ppm in Blue Mussels at Penn Cove on 5/23/07 and 4ppm in California mussels at Holmes Harbor on 5/24/07
Economic losses: Recreational and commercial shellfish harvest seasons were interrupted, causing an economic loss to the North Puget Sound Washington communities.
Management decision: DOH closed shellfish harvesting at impacted areas to protect public health.
Additional harmful effect information: