General Information

Event name: US-09-007
Nature of the harmful event:
Water Discoloration , High Phyto concentration
Event directly affected:
Toxicity detected: No
Associated syndrome:
Unexplained toxicity:
Species implicated in toxin transmission (transvector):
Report the outcome of a monitoring programme: Yes (Va. Dept. Health, Va. Dept. Environmental Quality)
Event occurred before in this location: Yes (common location for previous blooms)
Individuals to contact: MARSHALL, Harold G.

Location & Date

[View larger map]
Location: Latitude: 38.208611, Longitude: -76.966944
General location information: Potomac River, Virginia
HAB Area code(s): US-10
Additional location information: bloom concentrated in Mattox Creek with high cell concentrations also entering the Potomac River
Bloom event dates (yyyy/mm/dd): Start: 2009/04/24, End: 2009/05/04
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information:


Causative organism known: Yes
Causative Species/Genus: Prorocentrum minimum (5,180,000 cells/L)
Co-Ocurring Species/Genus:
Chlorophyll concentration, if known: µg/l
Additional bloom information:
Event-related bibliography: Marshall et al. 2008, 2009

Environmental Conditions

Weather: Turbidity (NTU): Wind direction:
Stratified water: Oxygen content (nL/L): 12.16 Wind velocity:
Temperature (°C): 20.3 Oxygen saturation %: Current Direction:
Sechhi disk (m): 0.4 Salinity: 6.4 Current Velocity:
Nutrient information:
Temperature Range During Event: Max: °C, Min: °C
Salinity Range During Event:
Bloom location in the water column: Whole column
In situ
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: