General Information

Event name: US-24-015
Country: UNITED STATES
Nature of the harmful event:
Seafood toxins
Event directly affected:
Shellfish
Toxicity detected: Yes (Approximate range: Maximum PSP toxins: 260-5434 µg/100g tissue.)
Associated syndrome: PSP
Unexplained toxicity:
Species implicated in toxin transmission (transvector):
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
Individuals to contact: BORCHERT, Jerry , BARRY, Tracie

Location & Date

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Location: Latitude: , Longitude:
General location information: Washington State, Strait of Juan de Fuca and Bays,
HAB Area code(s): US-24
Additional location information: PSP exceeded the action level in the west Strait of Juan de Fuca on June 24th, peaking at 1114 ug on August 27th in Sequim Bay. PSP exceedances continuing through mid-November in the Strait of Juan de Fuca and its bays.
Bloom event dates (yyyy/mm/dd):
Quarantine levels dates (yyyy/mm/dd): First detection: 2024-06-24, End: 2024-11-24
Additional date-related information:

Microalgae

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: 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:
In situ
Growth Comments
Additional Environmental information:

Toxin Assay Information

Species containing the toxin Toxin type Toxin details Max. concentration Assay type
Blue Mussels Saxitoxins 1114 ug/100g Bioassay-Mouse
California Mussels Saxitoxins 1069 ug Bioassay-Mouse
Geoduck Saxitoxins 1525 ug Bioassay-Mouse
Butter Clams Saxitoxins 260 ug Bioassay-Mouse
Horse Clams Saxitoxins 305 ug Bioassay-Mouse
Littleneck Clams Saxitoxins 50 ug Bioassay-Mouse
Pacific Oysters Saxitoxins 361 ug Bioassay-Mouse
Manila Clams Saxitoxins 44 ug Bioassay-Mouse
Rock Scallop - Adductor Saxitoxins 458 ug Bioassay-Mouse
Rock Scallop - Viscera Saxitoxins 5434 ug Bioassay-Mouse
Kit used: No Type of kit used:
Additional information:
Economic losses: Recreational, commercial and tribal ceremonial and subsistence shellfish harvests were interrupted, causing cultural and economic loss to Strait of Juan de Fuca Washington communities
Management decision: WADOH closed shellfish harvesting at impacted areas to protect public health
Additional harmful effect information:
Created at 08:46 on 10 Apr 2025
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