General Information

Event name: US-09-016
Nature of the harmful event:
Water Discoloration , High Phyto concentration
Event directly affected:
Planktonic life
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 (history of bloom formation that occurs in late summer and early autumn)
Individuals to contact: MARSHALL, Harold G.

Location & Date

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Location: Latitude: 37.241944, Longitude: -76.414167
General location information: York River, Virginia
HAB Area code(s): US-10
Additional location information: Lower York River segments, e.g. Sarah's Creek
Bloom event dates (yyyy/mm/dd): Start: 2009/08/24,
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information:


Causative organism known: Yes
Causative Species/Genus: Cochlodinium polykrikoides (3,790,000 cells/L)
associated odor
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: Oxygen content (nL/L): 6.22 Wind velocity:
Temperature (°C): 27.5 Oxygen saturation %: Current Direction:
Sechhi disk (m): 0.8 Salinity: 21.8 Current Velocity:
Nutrient information:
Temperature Range During Event: Max: °C, Min: °C
Salinity Range During Event:
Bloom location in the water 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: