General Information

Event name: US-03-021
Nature of the harmful event:
Event directly affected:
Toxicity detected: Yes (Approximate range: 44 - 81 µg STXeq / 100 g.)
Associated syndrome: PSP
Unexplained toxicity: No
Species implicated in toxin transmission (transvector): None occurred.
Report the outcome of a monitoring programme: Yes
Event occurred before in this location: Yes (PSP blooms occur on the southern coast of Oregon almost every year)
Individuals to contact: CANNON, Deborah F.

Location & Date

[View larger map]
Location: Latitude: , Longitude:
General location information: Oregon, southern most beaches, Oregon.
HAB Area code(s): US-22
Additional location information: Pacific NW, USA This event was evident only along the south coast line, on the Curry County beaches where rmussel habitat is abundant. Shellfish sampled from coastal bays did not reach toxic levels during this event.
Bloom event dates (yyyy/mm/dd): Start: 2003-08-13, End: 2003-11-18
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information: During 2003, only the southern coast (Coos Bay to California border) of Oregon saw any PSP toxin elevations, and then only in mussels. PSP became elevated at 54 – 75 µgms/ 100 gms at the Gold Beach sample site in August and jumped to 210 on Sept 8. A recreational shellfish harvesting closure went into effect on 9/10/2003 and the area from Coos Bay to the CA border was included in a closure that lasted until early Nov when levels dropped to 50 µgms/ 100 gms again. Razor clams and butter clams in the same area were not affected.


Causative organism known: Yes
Causative Species/Genus: Alexandrium 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: 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, Mussels, Other bay clams. Saxitoxins STX eq 210 Bioassay-Mouse
Kit used: Type of kit used:
Additional information:
Economic losses: Closure had no affect unknown on commercial processors and likely little affect on recreation/tourism in the area.
Management decision: Recreational closure required to assure public safety. Commercial bait harvesting is also closed to prevent any contaminated product from entering commerce.
Additional harmful effect information:
Updated at 03:44 on 26 Jun 2020