General Information

Event name: US-91-008
Nature of the harmful event:
Seafood toxins
Event directly affected:
Toxicity detected: Yes (Approximate range: 86 g STXeq / 100 g of shellfish meat.)
Associated syndrome: PSP
Unexplained toxicity: No
Species implicated in toxin transmission (transvector):
Report the outcome of a monitoring programme: Yes (Shellfish Monitoring Program. State of California Department of Health Services (SCDHS).)
Event occurred before in this location: Yes (1981.)
Individuals to contact: ROSS, Maria R.

Location & Date

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Location: Latitude: , Longitude:
General location information: Del Norte County. Point St. George., California.
HAB Area code(s): US-21
Additional location information: Point St. George (Wild Sea Mussel).
Bloom event dates (yyyy/mm/dd):
Quarantine levels dates (yyyy/mm/dd): End: 1991-10-31
Additional date-related information: September, October, December, no sample was submitted in 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 Most likely an in situ growth.
Additional Environmental information: No data available.

Toxin Assay Information

Species containing the toxin Toxin type Toxin details Max. concentration Assay type
Mussels Saxitoxins STX eq 86 Bioassay-Mouse
Kit used: Type of kit used:
Additional information:
Economic losses:
Management decision: California annual quarantine was in effect to October 31.
Additional harmful effect information: Through the months of September and December measurable but below the alert toxin levels were recorded in wild sea mussels. In October the concentration of toxin in the mussels rose to 86 g/100 g of shellfish meat.
Updated at 04:35 on 17 May 2018