General Information

Event name: US-07-002
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 (CA Department of Public Health Marine Biotoxin Monitoring Program)
Event occurred before in this location: Yes (Onset much earlier this year in Marin County. Distribution and magnitude of Southern CA event very unusual, 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. Santa Cruz (21): inside Monterey Bay. 2. San Luis Obispo County (20): North of Pt. Conception, encompasses Avila, Morro Bay and Cayucos. 3. Santa Barbara County (20). 4. Marin County (21)
Bloom event dates (yyyy/mm/dd):
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information: 1. Santa cruz County: Unusual elecated PSP toxicity in late Jan. (max = 106 ug/100 g) quickly decreased below alert level by mid-Feb. Persistent low level toxicity through Sept. 2. San Luis Obispo County: Unusual winter event: PSP toxin concentrations increased from non-detect to 153 ug during the last week of Jan. decreasing below the alert level by February 20 (max = 282 ug). 3. Santa Barbara County: low level detected late January, sporadic increases above alert level in mid-Feb (133 ug) and again in mid-march. Low levels persisted through end of April. 4. Marin County: Mid-June (6/18) increase above alert level (166 ug), increasing to max of 619 ug by 6/21. Decreased below alert level by July 19; sporadic spikes above alert level in Aug., with persistent low-level toxicity through Sept. 13.


Causative organism known: Yes
Causative Species/Genus: Alexandrium spp. ( cells/L)
Co-Ocurring Species/Genus:
Chlorophyll concentration, if known: µg/l
Additional bloom information: Alexandrium was observed at all locations experiencing PSP toxicity in shellfish. This dinoflagelate was a persistent member of the phytoplankton assemblage along the Southern CA coast for at least 13 consecutive months and was never completely absent in
Event-related bibliography: Monthly/Annual reports issued by CDPH 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 744 ug/100g 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: