| Event name: | US-04-003 | |
| Country: | UNITED STATES | |
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Nature of the harmful event: |
High Phyto concentration , Seafood toxins , Mass mortalities | |
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Event directly affected: |
Shellfish , Aquatic Mammals | |
| Toxicity detected: | Yes (Approximate range: 20 - 170 µg/g tissue) | |
| Associated syndrome: | ASP | |
| Unexplained toxicity: | No | |
| Species implicated in toxin transmission (transvector): | ||
| Report the outcome of a monitoring programme: | Yes (California Department of Health Services Marine Biotoxin Monitoring Program) | |
| Event occurred before in this location: | Yes (Spring event in San Luis Obispo, Santa Barbara typical over the past three years. Spring/summer event in northernmost California (Humboldt and Del Norte counties) resulted in dramatically high concentrations of domoic acid.) | |
| Individuals to contact: | LANGLOIS, Gregg | |
| Location: | Latitude: , Longitude: | |
| General location information: |
South Coast, Central Coast, Northern Coast, California HAB Area code(s): US-19 US-20 US-21 |
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| Additional location information: | 1. Santa Barbara County (19): South of Pt. Conception.2. San Luis Obispo County (20): North of Pt. Conception, encompasses Pismo Beach northward to Morro Bay and San Simeon.3. Santa Cruz County (21): North of Monterey, includes shoreline in Monterey Bay and open coast.4. Humboldt County (21): Northern California.5. Del Norte County, Northern California, borders Oregon. | |
| Bloom event dates (yyyy/mm/dd): | ||
| Quarantine levels dates (yyyy/mm/dd): | ||
| Additional date-related information: | March - July 1. Santa Barbara County: DA levels exceed alert level by late April through early May: 87 ppm in mussels and 26 ppm in pacific oysters.2. San Luis Obispo County: Da levels exceed alert level by late March: 45 ppm in mussels, 41 ppm in razor clams. 3. Santa Cruz County: DA level exceeds alert level in mid-April: 26 ppm in mussels.4. Humboldt County: DA concentrations above alert level detected in early June: 120 ppm in razor clams. Peak concentration detected was 170 ppm in razor clam muscle tissue (no viscera included).5. Del Norte County: DA concentration above alert level detected by late May: 33 ppm in razor clams. Elevated levels persisted through early July: 54 ppm | |
| 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: | 1. Santa Barbara County: Pseudo-nitzschia common from January-May, then July-August. Peak relative abundance observed in early April through first week of May.2. San Luis Obispo County: Highest relative abundance of Pseudo-nitzschia observed by volunteer | |
| Event-related bibliography: | Monthly/Annual reports issued by CDHS Marine Biotoxin Monitoring Program | |
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| Temperature Range During Event: | Max: °C, Min: °C | |||||||||||||||||||||||||
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| Bloom location in the water column: | ||||||||||||||||||||||||||
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| Kit used: | Type of kit used: | ||||||||||||||||||||||||||
| Additional information: | 170 ppm Jellet rapid extraction kit used on plankton samples HPLC | ||||||||||||||||||||||||||
| Economic losses: | |||||||||||||||||||||||||||
| Management decision: | Harvest closures in commercial aquaculture areas; Health Advisory for sportharvesting of shellfish in Northern California. | ||||||||||||||||||||||||||
| Additional harmful effect information: | Toxin levels detected in shellfish (primarily mussels, razor clams) and anchovy. | ||||||||||||||||||||||||||
