General Information

Event name: US-22-022
Nature of the harmful event:
High Phyto concentration , Seafood toxins
Event directly affected:
Shellfish , Humans
Toxicity detected: Yes (Approximate range: 145 μg/100 g shellfish tissue)
Associated syndrome: PSP
Unexplained toxicity: No
Species implicated in toxin transmission (transvector): California Mussels
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:
Individuals to contact: BORCHERT, Jerry , BARRY, Tracie

Location & Date

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Location: Latitude: , Longitude:
General location information: Washington State, Coastal beaches and bays, Pacific Region
HAB Area code(s): US-23
Additional location information: PSP exceeded action levels in Grays Harbor 9/25/22 through 10/3/22.
Bloom event dates (yyyy/mm/dd): Event Date:2022-09-25
Quarantine levels dates (yyyy/mm/dd): End: 2022-10-03
Additional date-related information:


Causative organism known: Yes
Causative Species/Genus: Alexandrium 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: 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
California Mussels Saxitoxins 145 g/100g tissue Bioassay-Mouse
Kit used: No Type of kit used:
Additional information:
Economic losses: Recreational shellfish harvests were closed in Grays Harbor and Willapa Bays for PSP and DSP respectively, and recreational and commercial razor clam harvests were interrupted by domoic acid closures, causing large cultural and economic losses to WA.
Management decision: WADOH closed shellfish harvesting at impacted areas to protect public health.
Additional harmful effect information: No reports of human/animal illness reported.
Created at 01:38 on 6 Apr 2023