General Information

Event name: US-20-018
Country: UNITED STATES
Nature of the harmful event:
High Phyto concentration , Seafood toxins
Event directly affected:
Shellfish
Toxicity detected: Yes (Approximate range: California Mussel (Mytilus californicus) 62 µg/100 g, Pacific Oyster 39 µg/100 g)
Associated syndrome: PSP
Unexplained toxicity: No
Species implicated in toxin transmission (transvector):
Report the outcome of a monitoring programme: Yes (California Department of Public Health - Marine Biotoxin Monitoring Program)
Event occurred before in this location: No
Individuals to contact: ZUBKOUSKY-WHITE, Vanessa

Location & Date

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Location: Latitude: , Longitude:
General location information: , Central California
HAB Area code(s): US-20
Additional location information:
Bloom event dates (yyyy/mm/dd):
Quarantine levels dates (yyyy/mm/dd): First detection: 2020-07-07, End: 2020-08-05
Additional date-related information:

Microalgae

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: Oxygen content (nL/L): Wind velocity:
Temperature (°C): Oxygen saturation %: Current Direction:
Sechhi disk (m): Salinity: Current Velocity:
Nutrient information:
Temperature Range During Event: Max: °C, Min: °C
Salinity Range During Event:
Bloom location in the water column:
Growth:
Growth Comments
Additional Environmental information:

Toxin Assay Information

Species containing the toxin Toxin type Toxin details Max. concentration Assay type
California mussel Saxitoxins 859 µg/100g Bioassay-Mouse
Pacific oyster Saxitoxins 39 µg/100 Bioassay-Mouse
Kit used: Yes Type of kit used: Scotia
Additional information: Shellfish homogenates are received on ice, extracted, and a Scotia rapid test determines whether the sample is positive or negative. Samples that are positive on Scotia are then tested using a mouse bioassay to determine concentration of PSP toxins.
Economic losses: No commercial growing areas were effected. Bloom took place during statewide mussel quarantine, so there were also no indirect losses from lost recreational harvesting opportunity.
Management decision: Recreational advisory was in place in all three counties, from the time of first positive result above 80µg/100g until all sites had two consecutive samples below 80µg/100g collected 14 days apart.
Additional harmful effect information:
Created at 12:30 on 20 Apr 2021
IOC/UNESCO ISSHA
IOC/UNESCO ICES PICES