General Information

Event name: US-93-010
Nature of the harmful event:
Seafood toxins
Event directly affected:
Toxicity detected: Yes (Approximate range: 23 ppmDA edible tissue of razor clams.)
Associated syndrome: ASP
Unexplained toxicity: No
Species implicated in toxin transmission (transvector):
Report the outcome of a monitoring programme: Yes
Event occurred before in this location: Yes (October 1991 - June 1992.)
Individuals to contact: McCALLUM, Mary

Location & Date

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Location: Latitude: , Longitude:
General location information: , Washington.
HAB Area code(s): US-23
Additional location information: Domoic acid occurred in razor clams on Pacific coast beaches.
Bloom event dates (yyyy/mm/dd):
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information: April-December.


Causative organism known: No
Causative Species/Genus:
Co-Ocurring Species/Genus:
Chlorophyll concentration, if known: µg/l
Additional bloom information: Unknown, but Pseudonitzschia pungens, P. australis, and P. pseudodelicatissima were found in coastal water in November.
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 Unknown.
Additional Environmental information: Coastal surf zone.

Toxin Assay Information

Species containing the toxin Toxin type Toxin details Max. concentration Assay type
Razor clams (edible tissue) Domoic Acid DA eq 17 ppm Bioassay-Mouse
Razor clams (edible tissue) Domoic Acid DA eq 23 ppm Bioassay-Mouse
Kit used: No Type of kit used:
Additional information: 17 ppm in edible tissue of Razor clams in April and 23 ppm in November.
Economic losses:
Management decision: Partial closure of recreational razor clam fishery during scheduled spring and fall harvest seasons.
Additional harmful effect information: Toxicity in Pacific razor clams, Siliqua patula.