General Information

Event name: US-11-006
Nature of the harmful event:
Seafood toxins
Event directly affected:
Toxicity detected: Yes (Approximate range: 94-954 g PSP; 1ppm DA; 3.9 g DSP)
Associated syndrome: PSP
Unexplained toxicity: No
Species implicated in toxin transmission (transvector): blue mussels; geoduck clams; butter clams
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 (Most of the inlets of Central Puget Sound have had previous PSP closures. ASP toxin has been detected in low levels in this region before 2011. DSP toxin has not been detected prior to 2011 in Central Puget Sound.)
Individuals to contact: COX, Frank

Location & Date

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Location: Latitude: , Longitude:
General location information: Washington State, Central Puget Sound, Pacific Northwest
HAB Area code(s): US-24
Additional location information: Central Puget Sound had 0 sites with over 1000 g of PSP toxin. However, CPS did have several recreational shellfish closures in Kitsap, King and Pierce Cos. due to PSP.
Bloom event dates (yyyy/mm/dd): Event Date:2011-07-06
Start: 2011-07-06, End: 2011-09-12
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information:


Causative organism known: Yes
Causative Species/Genus: Alexandrium catenella ( cells/L)
Pseudo-nitzschia sp. ( cells/L)
Dinobryon sp. ( 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 688 g Bioassay-Mouse
Blue mussels Domoic Acid 94 g LC
blue mussels Okadaic Acid 1ppm LC-MS
Kit used: No Type of kit used:
Additional information:
Economic losses: Recreational and commercial shellfish harvest seasons were interrupted, causing an economic loss to the Central Puget Sound Washington communities.
Management decision: DOH closed shellfish harvesting at impacted areas to protect public health.
Additional harmful effect information:
Updated at 06:52 on 4 Oct 2018