Harmful Algal Information System: Event US-95-011

General Information

Event name:	US-95-011
Country:	UNITED STATES
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.

Microalgae

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:

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: