General Information

Event name: US-93-011
Nature of the harmful event:
Seafood toxins
Event directly affected:
Toxicity detected: Yes (Approximate range: 4,012 g STXeq / 100 g. in blue mussels.)
Associated syndrome: PSP
Unexplained toxicity: No
Species implicated in toxin transmission (transvector):
Report the outcome of a monitoring programme: Yes
Event occurred before in this location: Yes (Annually in Puget Sound. Occasionally in coastal zone.)
Individuals to contact: McCALLUM, Mary

Location & Date

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Location: Latitude: , Longitude:
General location information: Puget Sound and surf zone of coastal beaches, Washington.
HAB Area code(s): US-23 US-24
Additional location information: PSP occurred at various localities around Puget Sound and in the surf zone of coastal beaches.
Bloom event dates (yyyy/mm/dd):
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information: June - October in Puget Sound. March through summer in the coastal surf zone.


Causative organism known: Yes
Causative Species/Genus: Alexandrium catenella ( 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:
In situ
Growth Comments Puget Sound: in situ. Coastal area: ??
Additional Environmental information: Estuarine/inland waters/protected embayments in Puget Sound Coastal surf zone.

Toxin Assay Information

Species containing the toxin Toxin type Toxin details Max. concentration Assay type
Blue mussel Saxitoxins STX eq 4,012 Bioassay-Mouse
Razor clams (edible tissue) Saxitoxins STX eq 180 Bioassay-Mouse
Kit used: No Type of kit used:
Additional information:
Economic losses:
Management decision: In Puget Sound, there were short-term closures of some commercial growing areas and advisory closures for recreational shellfish harvest. In the coastal area, there was a partial closure of the recreational razor clam fishery.
Additional harmful effect information: Shellfish toxicity exceeded closure level of 80 g/100 g.