Harmful Algal Information System: Event US-20-007

General Information

Event name:	US-20-007
Country:	UNITED STATES
Nature of the harmful event:	Seafood toxins
Event directly affected:	Shellfish
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

[View larger map]

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:

Microalgae

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:

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