General Information

Event name: US-91-013
Nature of the harmful event:
Seafood toxins
Event directly affected:
Toxicity detected: Yes (Approximate range: 390 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 (1970, 1971, 1982, 1983, 194, 1986, 1987, 1988, 1989, 1990.)
Individuals to contact: ROSS, Maria R.

Location & Date

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Location: Latitude: , Longitude:
General location information: San Mateo County., California.
HAB Area code(s): US-20
Additional location information: Pescadero State Beach, Linda Mar, Moss Beach, Bean Hollow State Beach (Wild Sea Mussels).
Bloom event dates (yyyy/mm/dd):
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information: January, February, April, May, June, July, October, November.


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 This appears to be an in situ population.
Additional Environmental information: No data available.

Toxin Assay Information

Species containing the toxin Toxin type Toxin details Max. concentration Assay type
Wild sea mussel (June Pescadero) Saxitoxins STX eq 173 Bioassay-Mouse
Wild sea mussel (Ben Hollow) Saxitoxins STX eq 390 Bioassay-Mouse
Wild sea mussel (Linda Mar) Saxitoxins STX eq 110 Bioassay-Mouse
Kit used: No Type of kit used:
Additional information:
Economic losses:
Management decision: The California Annual Mussel Quarantine was in effect.
Additional harmful effect information: In June Pescadero State Beach wild sea mussel samples assayed 173 g PSP; July wild sea mussel samples from Ben Hollow State Beach reached 390 g/100g and at Linda Mar 110 g, while the Pescadero State Beach samples remained at 100 g; October samples fro