General Information

Event name: US-95-011
Nature of the harmful event:
Seafood toxins
Event directly affected:
Toxicity detected: Yes (Approximate range: 8.6 ppm DA to 21.6 ppm. In late January 1996.)
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: No
Individuals to contact: CANNON, Deborah F.

Location & Date

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Location: Latitude: , Longitude:
General location information: Clatsop Beaches., Oregon.
HAB Area code(s): US-22
Additional location information: Oregon coast from Tillamook Head near Seaside to the Columbia River. This area is called the Clatsop Beaches.
Bloom event dates (yyyy/mm/dd):
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information: Toxicity in razor clams began 11/95 when domoic acid levels exceeded 5 ppm for the first time since 4/94.


Causative organism known: No
Causative Species/Genus:
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: 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
Additional Environmental information:

Toxin Assay Information

Species containing the toxin Toxin type Toxin details Max. concentration Assay type
Razor clams Domoic Acid DA eq 5 Bioassay-Mouse
Razor clams Domoic Acid DA eq 8.6 LC
Kit used: No Type of kit used:
Additional information: Toxicity in razor clams egan 11/95 when domoic acid levels exceeded 5 ppm for the first time since 4/94. Levels were 8.6 ppm by 12/20/95. (By 19/01/96 DA levels increased to 17.2, and by 31/01/96 to 21.6 ppm. Domoic acid was not seen in mussels from this area.
Economic losses: The razor clam fishery resource was not very good during the fall of 1995, there was little economic effect.
Management decision: Lot sampled during the end of January 1996; harvest closed in February 1996.
Additional harmful effect information: