General Information

Event name: US-06-020
Nature of the harmful event:
Seafood toxins
Event directly affected:
Toxicity detected: Yes (Approximate range: 4ppm-38ppm of domoic acid)
Associated syndrome: ASP
Unexplained toxicity: No
Species implicated in toxin transmission (transvector): Razor Clams
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 (WA Coast has been impacted by ASP on a yearly cycle, since 1991)
Individuals to contact: COX, Frank

Location & Date

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Location: Latitude: , Longitude:
General location information: Coastal Beaches and Coastal Estuaries, Washington State, Pacific Northwest
HAB Area code(s): US-23
Additional location information: Kalaloch, Mocrocks Beaches, and Quinault Reservation.
Bloom event dates (yyyy/mm/dd):
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information: Detection Dates: 7/18/06 Kalaloch, 8/09/06 Quinault Reservation, 8/21/06 Mocrocks. Final Date: 10/1/06 ASP bloom 2006 did not prevent the fall 2006 razor clam season. Crab season was not affected by domoic acid in 2006.


Causative organism known: Yes
Causative Species/Genus: 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
Razor Clams Domoic Acid see below LC
Kit used: No Type of kit used:
Additional information: Maximum concentration: 38ppm on 7/18/06 in razor clams at Kalaloch. 14ppm on 8/09/06 in razor clams at Quinault Reservation. 7ppm on 8/21/06 in razor clams at Mocrocks.
Economic losses: Recreational and commercial razor clam seasons were not interrupted due to domoic acid in 2006.
Management decision:
Additional harmful effect information: