General Information

Event name: US-17-031
Nature of the harmful event:
Seafood toxins
Event directly affected:
Toxicity detected: Yes (Approximate range: Maximum levels of ASP toxin: 24-52ppm. Maximum levels of PSP toxin: 166-321g.)
Associated syndrome: ASP , PSP
Unexplained toxicity: No
Species implicated in toxin transmission (transvector): ASP toxin: Razor clams. PSP toxin: California mussles.
Report the outcome of a monitoring programme: Yes (Marine Biotoxin Program at the Washington State Department of Health, Office of Environmental and Health and Safety.)
Event occurred before in this location: Yes (The Washington coast has been impacted by ASP since 1991.)
Individuals to contact: BORCHERT, Jerry , Coyne, Audrey

Location & Date

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Location: Latitude: , Longitude:
General location information: Washington State, Coastal Beaches and Estuaries, Pacific Northwest
HAB Area code(s): US-23
Additional location information: There was a Fall 2016 ASP event that impacted the southern Washington Coast 9/21/16-4/11/17. There was a Spring 2017 ASP event that impacted the Washington Coast from 5/4/17-7/11/17. The PSP closures occurred between 6/27/17-11/7/17.
Bloom event dates (yyyy/mm/dd):
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information:


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:
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
Razer clams Domoic Acid 53ppm LC
Blue mussels Saxitoxins 220 ug Bioassay-Mouse
Kit used: No Type of kit used:
Additional information:
Economic losses: Recreational and commercial razor clam harvests were interrupted, causing large economic losses to Washington's coastal communities.
Management decision: WADOH closed shellfish harvesting at impacted areas to protect public health.
Additional harmful effect information:
Created at 08:36 on 24 Apr 2018