| Event name: | US-24-019 | |
| Country: | UNITED STATES | |
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Nature of the harmful event: |
Seafood toxins , Mass mortalities | |
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Event directly affected: |
Birds , Shellfish , Aquatic Mammals | |
| Toxicity detected: | Yes (Approximate range: California Mussel (Mytilus californicus) 23 ppm, razor clam meat 230 ppm, Dungeness crab viscera 98 ppm) | |
| Associated syndrome: | ASP | |
| Unexplained toxicity: | No | |
| Species implicated in toxin transmission (transvector): | Clinical signs consistent with ASP toxicity syndrome observed in marine mammals was attributed to consumption of prey species (e.g., anchovy, sardine, market squid) containing domoic acid. | |
| 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 , MURPHY, Shannon | |
| 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: | domoic acid detected in bivave shellfish (< 20 ppm) April - November, domoic acid detected in crustaceans (< 30 ppm) September- December. ASP-related illness observed in 1 stranded California sea lion in Sonoma County in November. | |
| Bloom event dates (yyyy/mm/dd): | ||
| Quarantine levels dates (yyyy/mm/dd): | First detection: 2024-04-14, End: 2024-12-14 | |
| Additional date-related information: | ||
| Causative organism known: | Yes | |
| Causative Species/Genus: |
Pseudo-nitzschia 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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| Nutrient information: | ||||||||||||||||||||||||||
| Temperature Range During Event: | Max: °C, Min: °C | |||||||||||||||||||||||||
| Salinity Range During Event: | ||||||||||||||||||||||||||
| Bloom location in the water column: | Whole column | |||||||||||||||||||||||||
| Growth: |
In situ |
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| Growth Comments | ||||||||||||||||||||||||||
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| Kit used: | Type of kit used: | ||||||||||||||||
| Additional information: | Razor clams are known to store/retain domoic acid in their meat tissue at high levels long after associated pseudo-nitzschia blooms have subsided. | ||||||||||||||||
| Economic losses: | Recreational fishery closure for razor clams was in place for a potrion of the year due to samples frequently testing above the advisory threshold. | ||||||||||||||||
| Management decision: | Marine Mammal stranding events were responded to by the marine mammal care and stranding network of California. The California Interagency HAB-related Illness Workgroup tracks HAB-related illnesses and reported this stranding event to OHHABS | ||||||||||||||||
| Additional harmful effect information: | |||||||||||||||||
