General Information

Event name: US-11-005
Nature of the harmful event:
Seafood toxins
Event directly affected:
Toxicity detected: Yes (Approximate range: 9210 g PSP/kg)
Associated syndrome: PSP
Unexplained toxicity: No
Species implicated in toxin transmission (transvector): PSP -blue mussels, California mussels, manila clams, butter clams, varnish clams. ASP - blue mussels. DSP - blue mussels & manila 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 N. Puget Sound have had previous PSP closures. Penn Cove and Holmes Harbor had ASP blooms in 2005. ASP toxin did not reach the action level of 20 ppm in 2011. DSP toxin was detected for the first time in 2011. There were no DSP closures in N. Puget Sound because the toxin levels were below the action level of 16 m.)
Individuals to contact: COX, Frank

Location & Date

[View larger map]
Location: Latitude: 48.983056, Longitude: -122.766667
General location information: Washington state, North Puget Sound, Pacific Northwest
HAB Area code(s): US-24
Additional location information:
Bloom event dates (yyyy/mm/dd): Event Date:2011-05-10
Start: 2011-05-10, End: 2011-11-09
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information:


Causative organism known: Yes
Causative Species/Genus: Dinophysis sp. ( cells/L)
Pseudo-nitzschia sp. ( cells/L)
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: 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 Okadaic Acid 5.04 g LC-MS
Blue mussels Domoic Acid 2ppm LC
blue mussels Saxitoxins 921 g Bioassay-Mouse
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 North Puget Sound Washington communities
Management decision: DOH closed shellfish harvesting at impacted areas to protect public health
Additional harmful effect information:
Updated at 06:50 on 4 Oct 2018
Checked at 04:28 on 15 Apr 2015