General Information

Event name: US-00-011
Nature of the harmful event:
Water Discoloration , High Phyto concentration
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: No
Event occurred before in this location: Yes (Blooms of Alexandrium monilatum have occurred in the past (1979), and during the summers of 1998, 1999, and 2000)
Individuals to contact: MONCREIFF, Cynthia A.

Location & Date

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Location: Latitude: , Longitude:
General location information: Mississippi Bight., Mississippi, Gulf of Mexico.
HAB Area code(s): US-17
Additional location information: Bloom extended south from Dog Keys Pass along the eastern side of the Chandeleur Island chain.
Bloom event dates (yyyy/mm/dd): Start: 2000-09-12,
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information: Final date not known. Reports of discolored water were received for three weeks following detection of bloom.


Causative organism known: Yes
Causative Species/Genus: Alexandrium monilatum (550,000 cells/L)
Co-Ocurring Species/Genus:
Chlorophyll concentration, if known: µg/l
Additional bloom information: Reports of discolored water were received for three weeks following detection of bloom.
Event-related bibliography:

Environmental Conditions

Weather: Turbidity (NTU): Wind direction:
Stratified water: No 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: No Type of kit used:
Additional information:
Economic losses:
Management decision:
Additional harmful effect information: Dead zooplankton observed in freshly collected unconcentrated samples.