Harmful Algal Information System: Event US-93-013

General Information

Event name:	US-93-013
Country:	UNITED STATES
Nature of the harmful event:	Seafood toxins
Event directly affected:
Toxicity detected:	Yes (Approximate range: 16 ppm DA.)
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 (The last Oregon domoic acid alert began on the northern beaches in November 1991 in razor clams and continued to exceed 5 ppm until July 1992.)
Individuals to contact:	CANNON, Deborah F.

Location:	Latitude: , Longitude:
General location information:	Clatsop Beaches., Oregon. HAB Area code(s): US-22
Additional location information:	Oregon coast From Cape Lookout near Netarts 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:	Domoic acid levels in razor clams increased to 10 ppm in November 1993. Levels were 16 ppm in late December 1993. Mussels tester at 1 ppm in November.

Causative organism known:	No
Causative Species/Genus:
Co-Ocurring Species/Genus:
Chlorophyll concentration, if known:	µg/l
Additional bloom information:	Not known.
Event-related bibliography:

Weather:	Typical late summer and fall weather conditions. Fall rains began in early November which is later than usual.	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: 13 °C, Min: 10 °C

Salinity Range During Event:

Max: 30, Min: 25

Bloom location in the water column:

Growth:

Growth Comments

Not known.

Additional Environmental information:

Species containing the toxin	Toxin type	Toxin details	Max. concentration	Assay type
Razor clams	Domoic Acid	DA eq	16 ppm	LC
Mussels	Domoic Acid	DA eq	1 ppm	LC

Kit used: No

Type of kit used:

Additional information:

Economic losses:

Management decision:

Razor clam harvest on Clatsop Beaches continued to be closed due to PSP.

Additional harmful effect information:

The razor clam fishery was already closed because of PSP.