General Information

Event name: US-20-007
Nature of the harmful event:
Seafood toxins
Event directly affected:
Toxicity detected: Yes (Approximate range: 64-83ppm)
Associated syndrome: ASP
Unexplained toxicity: No
Species implicated in toxin transmission (transvector): razor clams, Dungeness crab
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
Individuals to contact: BORCHERT, Jerry

Location & Date

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Location: Latitude: , Longitude:
General location information: Washington Coast,
HAB Area code(s): US-23
Additional location information: ASP closures began 10/21/20-ongoing. First closure based on environmental data, pDA/ELISA. Coastal Dungness crab fishery delayed. Tribal fishery began 12/23/20. Non-tribal fishery delayed to 2021. DA in bivalve shellfish did not reach limit in coast bays.
Bloom event dates (yyyy/mm/dd): Start: 2020-10-21, End: 2020-12-31
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information:


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: 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
Razor clams Domoic Acid 83ppm LC
Dungeness crab Domoic Acid 64ppm LC
Kit used: Type of kit used:
Additional information:
Economic losses: Recreational and commercial razor clam and dungeness crab 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 11:02 on 19 Apr 2021