General Information

Event name: US-06-001
Nature of the harmful event:
High Phyto concentration , Seafood toxins
Event directly affected:
Toxicity detected: Yes (Approximate range: detectable to 1312 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 (Onset much earlier this year in Marin County. Distribution and magnitude of Southern California event very unusal -- if not unique.)
Individuals to contact: LANGLOIS, Gregg

Location & Date

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Location: Latitude: , Longitude:
General location information: California, South Coast, Central Coast, Northern Coast
HAB Area code(s): US-19 US-20 US-21
Additional location information: 1. San Luis Obispo County (20): North of Pt. of Conception, encompasses Avila, Morro Bay, and Cayucos. 2. Santa Cruz (21): Inside Monterey Bay. 3. San Luis Obispo through San Diego County (20, 19). 4. San Luis Obispo (20)
Bloom event dates (yyyy/mm/dd):
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information: 1. Marin County: Elevated PSP toxicity Jan - March. Alert level exceeded Jan 31 (93 ug), oscillated above and below alert level with maximum on March 7 (282 ug). 2. Santa Cruz County: Elevated PSP toxicity in early March (max = 118 ug), again in July through early August (max = 324). 3. San Luis Obispo through San Diego County: A very unusual occurrence of elevated PSP toxin concentrations along this large expanse of coastline in March. Alert levels in SLO, Santa Barbara, Ventura, LA, and San Diego counties. This event persisted through April along the SB coast (max = 774 ug in mussels) and offshore at the Channel Islands (max = 114 ug in mussels and 456 ug in rock scallop viscera). 4. San Luis Obispo: Another event spanning Sept. through mid-Nov. (max = 490 ug in mussels and 87 ug in oysters).


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 3 and 4. Alexandrium was observed at the beginning of the month at sites in San Luis Obispo and Santa Barbara. By mid month there were observations of Alexandrium near Catalina Island and inside San Diego Bay. By the last week of March, Alexandri
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
Crassostrea gigas Bioassay-Mouse
M. galloprovincialis Bioassay-Mouse
Mytilus californianus Saxitoxins 744 ug/100 g Bioassay-Mouse
Crassadoma gigantea (viscera 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, Health Advisory.
Additional harmful effect information:
Updated at 07:56 on 2 Nov 2020