General Information

Event name: US-01-009
Nature of the harmful event:
Water Discoloration
Event directly affected:
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: No
Individuals to contact: DORTCH, Quay

Location & Date

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Location: Latitude: , Longitude:
General location information: Vermilion Bay., Louisiana.
HAB Area code(s): US-17
Additional location information: Coastal northern Gulf of Mexico. Formed a floating scum on all of a very large, shallow bay which is part of the terminus of the Atchafalaya River, part of the Mississippi River system.
Bloom event dates (yyyy/mm/dd): Start: 2001-07-25,
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information: From July 25, 2001 to at least August 9.


Causative organism known: Yes
Causative Species/Genus: Microcystis sp. ( 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: 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:
In situ
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: I was called by a local office of the Louisiana Department of Wildlife and Fishereis. They were concerned about the magnitude of the bloom and the fact that shrimp season was opening 2 weeks after they contacted me. I sent them literature about what was
Additional harmful effect information: