General Information

Event name: US-01-015
Nature of the harmful event:
Seafood toxins
Event directly affected:
Toxicity detected: Yes (Approximate range: 1,070 g STXeq /100 g)
Associated syndrome: PSP
Unexplained toxicity: No
Species implicated in toxin transmission (transvector): Blue Mussels, Geoduck Clams, Manila Clams, Pacific Oysters.
Report the outcome of a monitoring programme: Yes (WA Dept. of Health, office of Food Safety & Shellfish Programs, Marine Biotoxin Monitoring Program.)
Event occurred before in this location: Yes (Some of the inlets of South Puget Sound have had previous PSP closures, while others were closed for the first time in history.)
Individuals to contact: COX, Frank

Location & Date

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Location: Latitude: , Longitude:
General location information: South Puget Sound: Carr Inlet, Case Inlet, El, Washington.
HAB Area code(s): US-24
Additional location information: South Puget Sound: Carr Inlet, Case Inlet, Eld Inlet, Pickering and Peale Passages are areas which closed and had a previous history of PSP Closures. Totten and Hammersley Inlets closed for the first time in history.
Bloom event dates (yyyy/mm/dd):
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information: Dates of quarantine levels: 24/07/01 - 31/10/01. Both recreational and commercial shellfish closures began in July, 2001. The Commercial closures were lifted by the end of October, while some recreational closures continued for Butter Clam only closures into the new year.


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:
Growth Comments
Additional Environmental information:

Toxin Assay Information

Species containing the toxin Toxin type Toxin details Max. concentration Assay type
Blue mussels Saxitoxins STX eq 1,070 Bioassay-Mouse
Geoduck, Manila clams, Pacific oyster Saxitoxins STX eq Bioassay-Mouse
Kit used: No Type of kit used:
Additional information: Blue Mussels - most toxic species. 1,070 g/100g of shellfish tissue on 8/01/01 in Blue mussels
Economic losses: Recreational and commercial shellfish harvest seasons were interrupted, causing an economic loss to the South Puget Sound Washington communities.
Management decision: DOH closed shellfish harvesting at impacted areas to protect public health.
Additional harmful effect information: