General Information

Event name: US-11-017
Nature of the harmful event:
Event directly affected:
Planktonic life
Toxicity detected: No
Associated syndrome:
Unexplained toxicity: No
Species implicated in toxin transmission (transvector):
Report the outcome of a monitoring programme: Yes (Chesapeake Bay Monitoring Program)
Event occurred before in this location: Yes (These blooms occur annually in the lower York, often extending into Chesapeake Bay)
Individuals to contact: MARSHALL, Harold G.

Location & Date

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Location: Latitude: 37.416667, Longitude: -76.810556
General location information: lower York River, Virginia, Chesapeake Bay
HAB Area code(s): US-10
Additional location information: Generally extensive covering broad region of the lower York River
Bloom event dates (yyyy/mm/dd):
Quarantine levels dates (yyyy/mm/dd): First detection: 2011-07-28, End: 2011-08-16
Additional date-related information: Often accompanied by other dinos in high conc


Causative organism known: Yes
Causative Species/Genus: Cochlodinium polykrikoides (16,350.000 cells/L)
at times ca. 1,000,000 to 5,000,000 cells / L
Co-Ocurring Species/Genus: Prorocentrum minimum (170,000 cells/L)
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): Oxygen saturation %: Current Direction:
Sechhi disk (m): Salinity: Current Velocity:
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:
Updated at 05:40 on 15 Apr 2015
Checked at 05:41 on 15 Apr 2015