| Event name: | US-22-012 | |
| Country: | UNITED STATES | |
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Nature of the harmful event: |
High Phyto concentration , Seafood toxins | |
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Event directly affected: |
Shellfish , Humans | |
| Toxicity detected: | Yes (Approximate range: 40-401 µg/100 g) | |
| Associated syndrome: | PSP | |
| Unexplained toxicity: | No | |
| Species implicated in toxin transmission (transvector): | California Mussels, Pacific Oysters, and Rock Scallop viscera | |
| Report the outcome of a monitoring programme: | Yes (California Department of Public Health - Marine Biotoxin Monitoring Program) | |
| Event occurred before in this location: | Yes | |
| Individuals to contact: | ZUBKOUSKY-WHITE, Vanessa | |
| Location: | Latitude: , Longitude: | |
| General location information: |
California - Del Norte, Humboldt, Mendocino, Sonoma, and Marin, San Mateo, Santa Cruz, Monterey Counties, HAB Area code(s): US-21 |
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| Additional location information: | Locations with >80 µg/100 g detected in mussels: Humboldt County - Humboldt Bay, San Mateo County - Bean Hollow State Beach, Monterey County - Monterey Wharf | |
| Bloom event dates (yyyy/mm/dd): |
Event Date:2022-08-30 |
|
| Quarantine levels dates (yyyy/mm/dd): | End: 2022-12-05 | |
| Additional date-related information: | ||
| Causative organism known: | Yes | |
| Causative Species/Genus: |
Alexandrium spp.
( cells/L)
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| Co-Ocurring Species/Genus: | ||
| Chlorophyll concentration, if known: | µg/l | |
| Additional bloom information: | ||
| Event-related bibliography: | ||
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| Temperature Range During Event: | Max: °C, Min: °C | |||||||||||||||||||||||||
| Salinity Range During Event: | ||||||||||||||||||||||||||
| Bloom location in the water column: | ||||||||||||||||||||||||||
| Growth: | ||||||||||||||||||||||||||
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| Kit used: Yes | Type of kit used: NeoGen | |||||||||||||||||||||
| Additional information: | Shellfish homogenates are received on ice, extracted, and a Neogen rapid test determines whether the mussel sample is positive or negative. Mussel samples that are positive on NeoGen are then tested using a mouse bioassay to determine concentration of PSP toxins. All other species are only tested with mouse bioassay. | |||||||||||||||||||||
| Economic losses: | Commercial areas in Humboldt and Tomales Bay went under biotoxin closures or biotoxin harvest restrictions and had more frequent testing. Recreational advisories were placed on all 3 counties at different times, mussel quarantine was not in effect so pote | |||||||||||||||||||||
| Management decision: | Precautionary biotoxin closures were placed on growing areas initially, but they were allowed to remain open if twice weekly testing from growing area product showed results lower than 80µg/100g. Recreational advisory was in place in all three counties, f | |||||||||||||||||||||
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