Harmful Algal Information System: Event US-07-018

General Information

Event name:	US-07-018
Country:	UNITED STATES
Nature of the harmful event:	Water Discoloration , High Phyto concentration
Event directly affected:	Planktonic life
Toxicity detected:	No
Associated syndrome:
Unexplained toxicity:	Yes (Suspected juvenile fish kill association but no confirmation regarding cause)
Species implicated in toxin transmission (transvector):
Report the outcome of a monitoring programme:	Yes (Chesapeake Bay Monitoring Program, Virginia HAB Program)
Event occurred before in this location:	Yes (A similar bloom occurred in these waters in 2006)
Individuals to contact:	MARSHALL, Harold G.

Location:	Latitude: , Longitude:
General location information:	Cgesaoeaje Vat, Virginia HAB Area code(s): US-10
Additional location information:	Potomac River from Colonial Beach downstream, bloom entered and persisted as a bloom within numerous shoreline inlets and several bays along its length.
Bloom event dates (yyyy/mm/dd):
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information:	Observations began June 13, 2007, concentrations reached 337,500 cells/ml on June 15, 2007 off Colonial Beach in the Potomac River. Molecular testing for species identification confirmed species was Karlodinium veneficum. Bloom levels continued to August 1, 2007. Detection at lower concentrations occurred into mid August.

Causative organism known:	No
Causative Species/Genus:	Karlodinium veneficum (337500000 cells/L) See Above
Co-Ocurring Species/Genus:	Akashiwo sanguinea (4600000 cells/L) Also present was Heterocapsa rotundatum
Chlorophyll concentration, if known:	µg/l
Additional bloom information:	Other dinoflagellates present in lower numbers were Scrippsiella trochoidea, Gymnodinium sp. and Prorocentrum minimum
Event-related bibliography: