General Information

Event name: US-01-016
Nature of the harmful event:
Seafood toxins
Event directly affected:
Toxicity detected: Yes (Approximate range: 1,048 g STXeq /100 g)
Associated syndrome: PSP
Unexplained toxicity: No
Species implicated in toxin transmission (transvector): Blue Mussels, Geoduck Clams, Manila Clams, Pacific Oysters.
Report the outcome of a monitoring programme: Yes (WA Dept. of Health, office of Food Safety & Shellfish Programs, Marine Biotoxin Monitoring Program.)
Event occurred before in this location: Yes (The Strait of Juan De Fuca and accompaning inlets have had previous PSP closures.)
Individuals to contact: COX, Frank

Location & Date

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Location: Latitude: , Longitude:
General location information: Strait of Juan de Fuca and Discovery Bay., Washington.
HAB Area code(s): US-24
Additional location information: Sequim Bay on the Strait of Juan De Fuca closed in July and Discovery Bay closed in August. The highest toxin level was recorded at Ediz Hook, near Port Angeles in August.
Bloom event dates (yyyy/mm/dd):
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information: Dates of quarantine levels: 18/07/01 - 27/02/02. Both recreational and commercial shellfish closures began in July, 2001. The Commercial closures were lifted in September. A second PSP bloom impacted many of the areas of the Straits again in October, causing closures. The second bloom recreational closures continued for all species or for Butter clam only closures into the new year.


Causative organism known: Yes
Causative Species/Genus: Alexandrium catenella ( 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: No 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 Saxitoxins STX eq 1,048 Bioassay-Mouse
Geoduck, Manila clams, Pacific oyster Saxitoxins STX eq Bioassay-Mouse
Kit used: No Type of kit used:
Additional information: Blue Mussels - most toxic species. 1,048 g STXeq / 100g of shellfish tissue on 13/08/01 in Blue mussels.
Economic losses: Recreational and commercial shellfish harvest seasons were interrupted, causing an economic loss to the communities along the Strait of Juan De Fuca.
Management decision: DOH closed shellfish harvesting at impacted areas to protect public health.
Additional harmful effect information: