General Information

Event name: US-07-022
Nature of the harmful event:
Seafood toxins
Event directly affected:
Toxicity detected: Yes (Approximate range: 940 micrograms PSP toxin at Indianola)
Associated syndrome: PSP
Unexplained toxicity: No
Species implicated in toxin transmission (transvector): Blue Mussels, Geoduck Clams, Manila Clams, Butter Clams, Pacific Oysters
Report the outcome of a monitoring programme: Yes (WA. Dept of Health, Office of SHellfish and Water Protection, Marine Biotoxin Monitoring Program)
Event occurred before in this location: Yes (Most of hte inlets of Central puget sound have had previous PSP closures.)
Individuals to contact: COX, Frank

Location & Date

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Location: Latitude: , Longitude:
General location information: Central Puget Sound, Washington, Pacific Northwest
HAB Area code(s): US-24
Additional location information: 2007 had 0 sites that recorded over 1000 micrograms of PSP toxin. However, central puget sound was the area most severely impacted from the bloom of 2006 and toxic affects carried over into 2007, impacting geoduck tracts in particular. There were a record 28 commercial geoduck tract closures in Central Puget Sound in 2007 where some remained closed well into the new year. There was an unprecendented bloom in Jan 2007, in the Kingaton area of North East Kitap County, causing a recreational closure on 1/18/07. A second bloom at the end of May closed N. Kitsap, north of kingston to foulweather bluff on may 30, 2007. On august 31, 2007 eat bainbridge island has a psp bloom, causing a recreational closure. The north kitsap closure was changed to a butter clam only closure and then changed back into an all species closure and was extended to Pt. No Pt. on 9/5/07. For more details lpease contact Frank Cox, see contact information above.
Bloom event dates (yyyy/mm/dd):
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information: Detection date: Kitsap Co. - 1st bloom 1/18/07, 2nd bloom 5/30/07, 3rd bloom 8/31/07, 4th bloom 9/5/07.... Final Date: Kitsap Co.: 1st bloom 4/12/07, 2nd bloom 6/27/07, 3rd bloom 10/11/07, 4th bloom 9/5/07 Kitsap county - kingston area 1/18--4/12, east bainbridge 8/31--10/11, North East Kitsap Co. Kingston Area to foulweather bluff 5/30--6/27. Extension of N.E. closure to Pt. NO Pt. 9/5--10/11. Geoduck Tract Closures: 10 geoduck tracts had 28 closures in Central Puget Suond in 2007. They are skiff Point N. 5/16--9/18. Apple Cove Pt. N 12/8/06--stioll closed as of 2/22/08, Indianola East 2/20--6/25, 8/6--9/5, 10/8--11/21. 12/5--12/17, 12/24/07--1/2/08, Murden Cove 1/16-1/24, 3/10--3/19, 7/30--8/6, Maury Island 1/12--3/16, 3/23--5/25, 6/1--6/18, 6/29--7/13. 8/3--9/21, 11/2--present, Battle POint 1/2--2/12, 2/22--3/14, Neil Point 1/16--10/17, East Blake Island 3/21--present, Lisabeula 3/2--5/25, 6/14--6/29, 7/13--9/21, Point Beals South 9/26--10/16, 11/26--12/13, 12/27/07--1/3/08, Blake Island North 3/28--5/29, 6/11--7/2, 8/20--8/27. Winter geoduck closures are not due to new blooms. They are the result of residual toxin from earlier blooms or resuspension of cysts by the digers who dig them with subsequent consumption of cysts by the clams.


Causative organism known: Yes
Causative Species/Genus: Alexandrium catenella ( cells/L)
Co-Ocurring Species/Genus:
Chlorophyll concentration, if known: µg/l
Additional bloom information:
Event-related bibliography:

Environmental Conditions

Weather: Turbidity (NTU): Wind direction:
Stratified water: Yes Oxygen content (nL/L): Wind velocity:
Temperature (°C): Oxygen saturation %: Current Direction:
Sechhi disk (m): Salinity: Current Velocity: 0
Nutrient information:
Temperature Range During Event: Max: °C, Min: °C
Salinity Range During Event:
Bloom location in the water column:
Growth Comments
Additional Environmental information:

Toxin Assay Information

Species containing the toxin Toxin type Toxin details Max. concentration Assay type
Geoduick Clam (Most toxic) Saxitoxins See Below Bioassay-Mouse
Blue mussel, butter clams, manila clams Saxitoxins Bioassay-Mouse
pacific oysters Saxitoxins Bioassay-Mouse
Kit used: No Type of kit used:
Additional information: Max Concentration -- 940 micrograms/100 grams of shellfish tissue on 5/14/07 in Geoduck Clams at Indianola East in Kitsap County.
Economic losses: Recreational and commercial shellfish harvest seasons were interrupted, causing an economic loss to the Central Puget Sound Washington communities.
Management decision: DOH closed shellfish harvesting at impacted aeras to protect public health.
Additional harmful effect information: