General Information

Event name: US-11-004
Nature of the harmful event:
Seafood toxins
Event directly affected:
Toxicity detected: Yes (Approximate range: 94 g in blue mussels at Pt Defiance)
Associated syndrome: PSP
Unexplained toxicity: No
Species implicated in toxin transmission (transvector): N/A
Report the outcome of a monitoring programme: Yes (WA Dept. of Health, Office of Shellfish & Water Protection, Marine Biotoxin Monitoring Program)
Event occurred before in this location: Yes (Since the 1980s, South PUget Sound has experienced periodic PSP blooms)
Individuals to contact: COX, Frank

Location & Date

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Location: Latitude: , Longitude:
General location information: Washington State, South Puget Sound, Pacific Northwest
HAB Area code(s): US-24
Additional location information: Recreational shellfish PSP closures: In Pierce Co., N. Tacoma Narrows closed on 8/10/11; reopened 8/26/11. Commercial shellfish closures: None in South Puget Sound in 2011.
Bloom event dates (yyyy/mm/dd): Event Date:2011-08-10
Start: 2011-08-10, End: 2011-08-26
Quarantine levels dates (yyyy/mm/dd): First detection: 2011-08-10, End: 2011-08-26
Additional date-related information:


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: Yes Oxygen content (nL/L): Wind velocity:
Temperature (°C): Oxygen saturation %: Current Direction:
Sechhi disk (m): Salinity: Current Velocity:
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
blue mussels Saxitoxins 94 g Bioassay-Mouse
Kit used: No Type of kit used:
Additional information:
Economic losses:
Management decision:
Additional harmful effect information:
Updated at 04:01 on 26 Jun 2020