General Information

Event name: US-17-034
Nature of the harmful event:
Seafood toxins
Event directly affected:
Toxicity detected: Yes (Approximate range: Maximum levels of PSP toxin: 106-556g. Maximum levels of DSP toxin: 23-108g.)
Associated syndrome: DSP , PSP
Unexplained toxicity: No
Species implicated in toxin transmission (transvector): PSP toxin: Blue mussels, manila clams, littleneck clams, Pacific oysters, geoduck clams. DSP toxin: Blue mussels, manila clams, Pacific oysters, rock scallops.
Report the outcome of a monitoring programme: Yes (Marine Biotoxin Program at the Washington State Department of Health, Office of Environmental and Health and Safety.)
Event occurred before in this location: Yes (PSP closures have occurred in the Strait of Juan de Fuca previously. The first DSP in the Strait of Juan de Fuca was in 2011, in Sequim Bay.)
Individuals to contact: BORCHERT, Jerry , Coyne, Audrey

Location & Date

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Location: Latitude: , Longitude:
General location information: Washington State, Strait of Juan de Fuca and Olympic Peninsula, Pacific Northwest
HAB Area code(s): US-24
Additional location information: PSP closures occurred between 4/25/17-1/31/18. DSP closures occurred between 8/28/17-12/13/17.
Bloom event dates (yyyy/mm/dd):
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information:


Causative organism known: Yes
Causative Species/Genus: Alexandrium catenella ( cells/L)
Dinophysis 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: 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 518 ug Bioassay-Mouse
Manila clams Saxitoxins 98 ug Bioassay-Mouse
Littleneck clams Saxitoxins 163 ug Bioassay-Mouse
Pacific Oysters Saxitoxins 111 ug Bioassay-Mouse
Geoduck clams Saxitoxins 447 ug Bioassay-Mouse
Blue mussels Okadaic Acid 35 ug LC-MS
Geoduck clams Okadaic Acid 21 ug 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 Olympic Peninsual Washington communities.
Management decision: WADOH closed shellfish harvesting at impacted areas to protect public health.
Additional harmful effect information:
Created at 08:54 on 24 Apr 2018