| Event name: | US-20-017 | |
| 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 | |
| Toxicity detected: | Yes (Approximate range: California Mussel (Mytilus californicus) 1619 µg/100 g, Pacific Oyster 50 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: | Yes | |
| Individuals to contact: | ZUBKOUSKY-WHITE, Vanessa | |
| Location: | Latitude: , Longitude: | |
| General location information: |
Humboldt, Mendocino, Sonoma, and Marin, San Mateo, Santa Cruz, Monterey Counties, California HAB Area code(s): US-21 |
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| Additional location information: | ||
| Bloom event dates (yyyy/mm/dd): | ||
| Quarantine levels dates (yyyy/mm/dd): | First detection: 2020-06-25, End: 2020-12-29 | |
| Additional date-related information: | First detection 2/17 in Monterey | |
| Causative organism known: | Yes | |
| Causative Species/Genus: |
Alexandrium catenella
( 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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| Nutrient information: | ||||||||||||||||||||||||||
| Temperature Range During Event: | Max: °C, Min: °C | |||||||||||||||||||||||||
| Salinity Range During Event: | ||||||||||||||||||||||||||
| Bloom location in the water column: | ||||||||||||||||||||||||||
| Growth: | ||||||||||||||||||||||||||
| Growth Comments | ||||||||||||||||||||||||||
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| 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: | Commercial areas in Humboldt and Tomales Bay went under biotoxin closures and had more frequent testing. Recreational advisories were placed on all 4 counties at different times, indirect economic losses from lost rec. harvest. | |||||||||||
| 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. | |||||||||||
| Additional harmful effect information: | Recreational advisory was in place in all four 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. | |||||||||||
