General Information

Event name: US-91-010
Nature of the harmful event:
Seafood toxins
Event directly affected:
Toxicity detected: Yes (Approximate range: 3,300 g STXeq / 100 g.)
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 (1932, 1962, 1966, 1967, 1969, 1975, 1982, 1984, 1989, 1990.)
Individuals to contact: ROSS, Maria R.

Location & Date

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Location: Latitude: , Longitude:
General location information: Mendocino County., California.
HAB Area code(s): US-21
Additional location information: Westport/Bruhel Pt., Fort Bragg/Virgin Creek and Ten-Mile River, Anchor Bay (Wild Sea Mussels).
Bloom event dates (yyyy/mm/dd):
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information: July - October, December.


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:
In situ
Growth Comments Most probably an in situ growth population.
Additional Environmental information: No data available

Toxin Assay Information

Species containing the toxin Toxin type Toxin details Max. concentration Assay type
Mussel tissue (July) Saxitoxins STX eq 930 Bioassay-Mouse
Shellfish meat (July) Saxitoxins STX eq 3,300 Bioassay-Mouse
Kit used: No Type of kit used:
Additional information: In September, October and December the levels decreased to high measurable but below alert levels.
Economic losses:
Management decision: The California Annual Mussel Quarantine was in effect however it was extended indefinitely by the state health director as a precautionary measure.
Additional harmful effect information: