General Information

Event name: US-04-022
Nature of the harmful event:
Seafood toxins
Event directly affected:
Toxicity detected: Yes (Approximate range: 39 - 118 µgms/100 gms)
Associated syndrome: PSP
Unexplained toxicity: No
Species implicated in toxin transmission (transvector): None occurred
Report the outcome of a monitoring programme: Yes (Oregon Dept of Agriculture, Shellfish Sanitation Program)
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

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Location: Latitude: , Longitude:
General location information: Oregon, southern most beaches, Pacific NW, USA
HAB Area code(s): US-22
Additional location information: This event was evident along the entire coast line but highest on south coast line, on the Curry County beaches where rmussel habitat is abundant. Other shellfish sampled from coastal bays did not reach toxic levels during this event.
Bloom event dates (yyyy/mm/dd): Start: 2004-08-25, End: 2004-09-13
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information: During 2004, the north, central and especially the southern coast (Coos Bay to California border) of Oregon saw some PSP toxin elevations. Only mussels were affected except for detectable levels (39) in oysters from a small bay on the north coast, Netarts Bay. PSP became elevated to 39 – 64 µgms/ 100 gms in mussels from the north and central coast the week of June 21 and jumped to 118 on the south coast by the week of Aug 23, 2004. A recreational shellfish harvesting closure went into effect on 8/27/04 and the area from Coos Bay to the CA border was included in a closure that lasted until Oct 1 when levels dropped to <39 µgms/ 100 gms again. Razor clams and butter clams in the same areas were not affected. No commercial areas were closed.


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
Mussels (California), Other oyster (Pacific Saxitoxins STX eq 118 Bioassay-Mouse
Kit used: Type of kit used:
Additional information:
Economic losses: PSP 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 03:52 on 26 Jun 2020