General Information

Event name: US-92-021
Nature of the harmful event:
Seafood toxins
Event directly affected:
Toxicity detected: Yes
Associated syndrome: PSP
Unexplained toxicity: No
Species implicated in toxin transmission (transvector):
Report the outcome of a monitoring programme: Yes
Event occurred before in this location: Yes (Previous occurrence in the same area in 1984 - late June/early July. Razor clams and commercial oysters. Toxicity levels in 1992 were highest on record. Levels in 1984 did not exceed 94 g/100 gms in the edible meat or 1370 g/100 gms in the viscera of razor clams.)
Individuals to contact: McCALLUM, Mary

Location & Date

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Location: Latitude: , Longitude:
General location information: Pacific coast., Washington.
HAB Area code(s): US-23
Additional location information: Pacific Coast of Washington State and coastal estuaries of Willapa Bay and Grays Harbor.
Bloom event dates (yyyy/mm/dd):
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information: Late September - early October.


Causative organism known: No
Causative Species/Genus: Alexandrium catenella ( cells/L)
Not confirmed
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:
In situ
Growth Comments Probably in situ. Higher levels on outer coast in surf zone - lower levels in estuarine embayments.
Additional Environmental information: Environmental parameters (temperature, salinity, do) not measured by state health agency. Data may be available from other state agencies. 'El Nio' year.

Toxin Assay Information

Species containing the toxin Toxin type Toxin details Max. concentration Assay type
Kit used: No Type of kit used:
Additional information: Shellfish toxicity: highest levels measured in razor clams in the surf zone. Lower levels in commercial oysters and clams within coastal estuaries.
Economic losses: Commercial shellfish industry estimates 'one million dollars' lost due to recall and closures.
Management decision: Postponement of recreational razor clam fishery opening scheduled for October 9, 1992 until November 13, 1992. Closure of commercial oyster beds in Willapa Bay and Grays Harbor. Minor product recall.
Additional harmful effect information: