General Information

Event name: US-03-007
Nature of the harmful event:
Seafood toxins , Other ( Low densities of Alexandrium detected)
Event directly affected:
Toxicity detected: Yes (Approximate range: 40 - 1600 g STXeq / 100 g tissue.)
Associated syndrome: PSP
Unexplained toxicity: No
Species implicated in toxin transmission (transvector):
Report the outcome of a monitoring programme: Yes (California Department of Health Services' Marine Biotoxin Monitoring Program)
Event occurred before in this location: Yes
Individuals to contact: LANGLOIS, Gregg

Location & Date

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Location: Latitude: , Longitude:
General location information: Humboldt, Mendocino, Sonoma, Marin, San Mateo, California, Northern California.
HAB Area code(s): US-20 US-21
Additional location information: NORTHERN CALIFORNIA (progressing north to south).
Bloom event dates (yyyy/mm/dd): Start: 2003-08-27, End: 2003-11-06
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information: Humboldt County: low level PSP toxicity from mid July through mid November, with a slight increase to 81 g on August 27; Mendocino County: measureable toxicity from mid August through mid-November, with a peak of 1600 ug on September 29; Sonoma County: measurable PSP toxicity from late September through mid November, with a peak concentration of 110 ug in late September; Marin County: measurable PSP toxicity from mid February through late December, with concentrations exceeding the alert level from late October through early November, with a peak of 334 ug on October 29; San Mateo County: low level toxicity from late September through late December; Santa Cruz County: low level toxicity in April, August, from late October through late November.


Causative organism known: Yes
Causative Species/Genus: Alexandrium spp. ( cells/L)
Co-Ocurring Species/Genus:
Chlorophyll concentration, if known: µg/l
Additional bloom information: Additional species: Numerous dinoflagellate and diatom species.
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:
Growth Comments
Additional Environmental information:

Toxin Assay Information

Species containing the toxin Toxin type Toxin details Max. concentration Assay type
Kit used: No Type of kit used:
Additional information:
Economic losses:
Management decision:
Additional harmful effect information: