General Information

Event name: US-10-012
Nature of the harmful event:
Water Discoloration , High Phyto concentration
Event directly affected:
Planktonic life , Natural Fish
Toxicity detected: No
Associated syndrome:
Unexplained toxicity: Yes (no toxin analysis conducted, probably low DO)
Species implicated in toxin transmission (transvector):
Report the outcome of a monitoring programme: Yes (Chesapeake Bay Phytoplankton Monitoring Program)
Event occurred before in this location: Yes (annual bloomer)
Individuals to contact: MARSHALL, Harold G.

Location & Date

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Location: Latitude: , Longitude: -76.820556
General location information: James River, Southeast Virginia
HAB Area code(s): US-10
Additional location information: Tributary to Chesapeake Bay, VA. During this period, the species had extensive bloom development in several tributaries to the lower James River (e.g. the Lafayette & Elizabeth Rivers)
Bloom event dates (yyyy/mm/dd): Event Date:2010-07-08
Start: 2010-07-08, End: 2010-08-12
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information:


Causative organism known: Yes
Causative Species/Genus: Cochlodinium polykrikoides (80,000,000 cells/L)
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): Wind velocity:
Temperature (°C): 28.1 Oxygen saturation %: Current Direction:
Sechhi disk (m): 0.4 Salinity: 22.2 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: Bloom moved from lower James River tributary to the Elizabeth River, into the lower James, entering adjacent inlets, passing downstream into the lower Chesapeake Bay.

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:
Checked at 05:08 on 15 Apr 2015