General Information

Event name: US-07-019
Nature of the harmful event:
Water Discoloration , High Phyto concentration , Other ( Odor)
Event directly affected:
Planktonic life
Toxicity detected: No
Associated syndrome:
Unexplained toxicity: Yes (There was one report of dead crabs occurring in the Elizabeth River, 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 Monitoring)
Event occurred before in this location: Yes (This region is subject to summer bloom events from this species)
Individuals to contact: MARSHALL, Harold G.

Location & Date

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Location: Latitude: , Longitude:
General location information: James River estuarine cmoplex, Lower York R., Chesapeake Bay, VA
HAB Area code(s): US-10
Additional location information: Extensive bloom began in the lower Chesapeake Bay sub-estuaries from the James River complex and also in the York River, VA.
Bloom event dates (yyyy/mm/dd):
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information: August 15, 2007 to September 20, 2007


Causative organism known: Yes
Causative Species/Genus: Cochlodinium polykrikoides (7820000 cells/L)
Co-Ocurring Species/Genus: Alexandrium monilatum (1970000 cells/L)
This species was noted sept. 6-13 in the lower York River. No toxic events reported.
Chlorophyll concentration, if known: µg/l
Additional bloom information: The bloom initially developed in the Elizabeth and Lafayette Rivers, spread into the lower James River and surrounding inlets. This was followed by bloom concentrations in the York River, but in lower concentrations. By Sept. 11, the bloom developed alo
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: