General Information

Event name: US-05-002
Nature of the harmful event:
High Phyto concentration , Seafood toxins
Event directly affected:
Toxicity detected: Yes (Approximate range: 81 - 879 ug/100 g tissue)
Associated syndrome: PSP
Unexplained toxicity:
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: California, Central Coast
HAB Area code(s): US-20 US-21
Additional location information: 1. San Luis Obispo County (20): North of Pt. Conception, encompasses Morro Bay and Cayucos. 2. Santa Barbara County (21): South of Pt. Conception, offshore 0.75 miles. 3. Marin County (21): North of Golden Gate (San Francisco).
Bloom event dates (yyyy/mm/dd): Start: 2005-02-01, End: 2005-07-01
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information: 1. San Luis Obispo County: Low level PSP toxicity Jan - February. Alert level exceeded late Feb (250 ug), declining below alert level by early March. 2. Santa Barbara County: Low level PSP toxicity in late March, exceeding alert level by 1st week in April. Max concentrations by late April (421 ug), declining below alert level by late April. 3. Marin County: Low level PSP toxicity in mid February, then a gain in June, exceeding alert level by June 27 (155 ug). Peak concentration (879 ug) reached by July 20, declining below alert level by August. Low levels persisted through 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:
Event-related bibliography: Monthly/Annual reports issued by CDHS Marine Biotoxin Monitoring Program.

Environmental Conditions

Weather: Turbidity (NTU): Wind direction:
Stratified water: 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
Mytilus californianus Saxitoxins 770 ug/100 g Bioassay-Mouse
M. galloprovincialis Saxitoxins 1602/100 Bioassay-Mouse
Crassostrea gigas Saxitoxins 420/100 Bioassay-Mouse
Kit used: Yes Type of kit used: Jellet/AOAC for screening in l
Additional information:
Economic losses:
Management decision: Harvest closures in commercial aquaculture areas; annual quarantine on sport-harvested mussels.
Additional harmful effect information: