Harmful Algal Information System: Event US-24-009

General Information

Event name:	US-24-009
Country:	UNITED STATES
Nature of the harmful event:	Water Discoloration , High Phyto concentration
Event directly affected:	Planktonic life , Humans
Toxicity detected:	No
Associated syndrome:
Unexplained toxicity:	No
Species implicated in toxin transmission (transvector):
Report the outcome of a monitoring programme:	Yes (Marine Biotoxin Program at the Washington State Department of Health, Office of Environmental and Health and Safety.)
Event occurred before in this location:	Yes (The last time a large-scale Tripos spp. bloom was observed on the WA coast were in the falls of 1994 & 1995 causing economic impacts due to consumer concern over staining.)
Individuals to contact:	BORCHERT, Jerry , BARRY, Tracie

Location:	Latitude: , Longitude:
General location information:	Washington State, Coastal beaches and bays, HAB Area code(s): US-23
Additional location information:	Water and shellfish were discolored red/orange by a significant Tripos spp. bloom (>2million cells/L) causing concern among recreational harvesters and industry alike in late September/early October.
Bloom event dates (yyyy/mm/dd):
Quarantine levels dates (yyyy/mm/dd):	First detection: 2024-09-15, End: 2024-10-15
Additional date-related information:

Causative organism known:	Yes
Causative Species/Genus:	Ceratium tripos (2,686,000 cells/L) Reported as Tripos spp.
Co-Ocurring Species/Genus:
Chlorophyll concentration, if known:	µg/l
Additional bloom information:
Event-related bibliography: