General Information

Event name: US-11-018
Nature of the harmful event:
Water Discoloration , High Phyto concentration , Freshwater
Event directly affected:
Planktonic life
Toxicity detected: Yes (Approximate range: <3.0 g / L)
Associated syndrome: Cyanobacterial toxins effects
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: No
Individuals to contact: MARSHALL, Harold G.

Location & Date

[View larger map]
Location: Latitude: 38.708056, Longitude: -77.593611
General location information: Aquia Creek, Virginia, Chesapeake Bay
HAB Area code(s): US-10
Additional location information: Surface water discoloration was sevident.
Bloom event dates (yyyy/mm/dd):
Quarantine levels dates (yyyy/mm/dd): First detection: 2011-07-24, End: 2011-08-02
Additional date-related information: High cell conc. 7/24-29, then declined.


Causative organism known: Yes
Causative Species/Genus: Microcystis aeruginosa (335,000,000 cells/L)
Co-Ocurring Species/Genus:
Chlorophyll concentration, if known: µg/l
Additional bloom information: 7/24: pH 9.3, DO 8.7 mg/l, temp. 32.2C, salinity 0.13
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:
Checked at 05:37 on 15 Apr 2015