General Information

Event name: US-02-024
Nature of the harmful event:
Seafood toxins
Event directly affected:
Toxicity detected: Yes (Approximate range: 188 ppm DA.)
Associated syndrome: ASP
Unexplained toxicity: No
Species implicated in toxin transmission (transvector): Razor Clams, Dungeness Crab
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 (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: 45.333333, Longitude: -124.066667
General location information: Long Beach Peninsula, Twin Harbor Beach, Mocr, Washington.
HAB Area code(s): US-23
Additional location information: Pacific Northwest. Coastal Beaches and Coastal Estuaries.
Bloom event dates (yyyy/mm/dd): Start: 2002-09-23, End: 2003-11-03
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information: Still toxic as of 03/11/03. September bloom prevented the fall razor clam season on the coast and will probably prevent the spring season as well. Many samples still around 100ppm. Crab season for Willapa Bay was closed on February 7, 2003, as a result of crabs feeding on razor clams that became toxic from feeding on the September 2002 algal bloom.


Causative organism known: Yes
Causative Species/Genus: Pseudo-nitzschia spp. ( 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
Razor Clams (10/21/02) Domoic Acid DA eq 188 ppm LC
Dungeness crab (02/11/03) Domoic Acid DA eq 60 ppm LC
Kit used: No Type of kit used:
Additional information:
Economic losses: Recreational and commercial razor clam seasons were interrupted, causing an economic loss to the Washington coastal communities. The dungeness crab closure in Willapa Bay had similar impacts.
Management decision: DOH closed razor clam harvesting at impacted beaches to protect public health. DOH closed crab fishing in Willapa Bay to protect public health.
Additional harmful effect information: