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Location:
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Latitude: , Longitude:
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General location information:
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Oregon Coast, Pacific NW, USA
HAB Area code(s): US-22
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Additional location information:
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Oregon Coast, Clatsop beaches (northern most county), and north central beaches (next two counties south). Shellfish harvest areas on Clatsop and north and central coast beaches (Astoria - Coos Bay) were open at the beginning of the year, the far south coast (coos bay - CA border) was closed due to toxin residuals from 2005 but opened by June 2006. The DA event of 2006 began in early July and affected the north and north central until early august when levels in shellfish again trended downward.
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Bloom event dates (yyyy/mm/dd):
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Quarantine levels dates (yyyy/mm/dd):
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Additional date-related information:
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Detection date: 07/12/06 in razor clams on N coast; 7/25/06 in razors on C coast. Pseudo-Nitzschia cell counts monitored by NOAA grant were elevated to 177k cells/liter on 7/11/06 in N coast samples with all species represented. Final date: DA toxin levels in razor clams declined from 7/25/06 peak of 31 ppm to <20 ppm by 10/04/06. Pseudo-nitzschia cell counts less than 1000 by mid-August.
Clatsop Beach on north coast of OR began the calendar year of 2006 in open status for all razor clam harvesting; commercial and recreational. Levels of DA were below 3 ppm 6/29 and Pseudo-nitzschia counts were 3000 per liter on 7/4, just prior to the beginning of the event. During a low tides series in the 2nd wk of July 2006, razor clams and phytoplankton samples were collected. Results of the phytoplankton examinations were available the day before 7/12 lab results for razor clams testing 7/13. Pseudo-nitzschia cells were elevated to 177,000 per liter; razor clams on Clatsop Beach jumped from 2.7 (6/29) to 27 (7/12); and mussels elevated from < 1 to 3.5 ppm DA on a beach 60 mi to the S. Toxin levels in razor clams off agate beach on N central coast rose from 8 ppm DA on 7/10 to 20 on 7/25. The peak of 31 ppm at the So Jetty of the Columbia R on Clatsop Bch. Levels dropped to less than 20 ppm DA in razor clams on the N and N-Central beaches by 10/04/06l. Pseudo-nitschia levels fell to 100 cells per liter by 8/14/06. These areas were reopened to all harvesting by oct 14, 2006.
Mussels on the N and N-central coast ranged from 3.5 - 7.6 for DA during July of 2006 but were not closed to harvest. Other species of clams-softshells and butters; were non-detectable for DA during event. Detectable levels of DA were not found in oysters, coastwide during 2006.
There was no evidence of a DA producing algae bloom on the S-central or South coast. Razor clams on the south coast were still closed for residual toxins at the beginning of 2006. All areas were open by the end of June 2006 and stayed less than 10 ppm during the N-coast bloom event. Pseudo-nitzschia cell counts were elevated to 12,000 cells per liter on the south coast during july but no changes in DA levels were detected in south coast razor clam samples or any other shellfish species.
For the first time in 3 years, at the end of 2006, all areas of the Oregon coast were open to shellfish harvesting; DA levels in razor clams were less than 15 ppm.
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