General Information

Event name: US-08-006
Nature of the harmful event:
Water Discoloration , High Phyto concentration
Event directly affected:
Planktonic life
Toxicity detected: Yes (Approximate range: within Potomac River sites)
Associated syndrome:
Unexplained toxicity:
Species implicated in toxin transmission (transvector): Karlodinium veneficum
Report the outcome of a monitoring programme: Yes (Virginia Department of Health)
Event occurred before in this location: Yes (Also reported at similar locations in the Virginia tributaries to the Potomac River in 2007)
Individuals to contact: MARSHALL, Harold G.

Location & Date

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Location: Latitude: 38.155000, Longitude: -76.733056
General location information: Potomac River Tributaries, Virginia, Southeastern Virginia
HAB Area code(s): US-10
Additional location information: Virginia tidal creeks and rivers entering the Potomac River mainly from the lower third region of the Potomac River
Bloom event dates (yyyy/mm/dd): Start: 2008-02-14, End: 2008-08-07
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information:


Causative organism known: Yes
Causative Species/Genus: Karlodinium veneficum (1,630,,000 cells/L)
Co-Ocurring Species/Genus:
Chlorophyll concentration, if known: µg/l
Additional bloom information: High concentrations continued from early spring to mid-summer
Event-related bibliography:

Environmental Conditions

Weather: Turbidity (NTU): Wind direction:
Stratified water: 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
Kit used: Type of kit used:
Additional information:
Economic losses:
Management decision:
Additional harmful effect information: