General Information

Event name: US-10-013
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)
Species implicated in toxin transmission (transvector): Event resulted in extensive menhaden fish kill
Report the outcome of a monitoring programme: Yes (Chesapeake Bay Plankton Monitoring Program)
Event occurred before in this location: No
Individuals to contact: MARSHALL, Harold G.

Location & Date

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Location: Latitude: 37.879444, Longitude: 76.667778
General location information: Cobbs Creek, Southeast Virginia
HAB Area code(s): US-10
Additional location information: Matthews County, Virginia
Bloom event dates (yyyy/mm/dd): Event Date:2010/08/10
Start: 2010/08/10, End: 2010/08/17
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information:


Causative organism known: Yes
Causative Species/Genus: Chattonella subsalsa (1-10 cells/L)
Co-Ocurring Species/Genus: Gymnodinium sp. (1-5 cells/L)
Chlorophyll concentration, if known: µg/l
Additional bloom information:
Event-related bibliography:

Environmental Conditions

Weather: Turbidity (NTU): Wind direction:
Stratified water: Yes Oxygen content (nL/L): Wind velocity:
Temperature (°C): 29 Oxygen saturation %: 167 Current Direction:
Sechhi disk (m): Salinity: 17.5 Current Velocity:
Nutrient information:
Temperature Range During Event: Max: 29 °C, Min: °C
Salinity Range During Event: Max: 17.5,
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: bloom concentrations subsided, no further extended impact tofish outside the small creek