General Information

Event name: US-03-012
Nature of the harmful event:
High Phyto concentration , Other ( Water discoloration at times)
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: Yes (This area frequently sees high concentrations of the species listed in Section 3 below; typical species and abundances over an annual cycle)
Individuals to contact: RABALAIS, Nancy

Location & Date

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Location: Latitude: 30.060000, Longitude: -89.600000
General location information: Lake Pontchartrain, lat/lon about mid-basin, Lousiana.
HAB Area code(s): US-17
Additional location information:
Bloom event dates (yyyy/mm/dd):
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information: The species data listed in Section 3 below were compiled from a single station in the center of the lake, off the causeway bridge. Samples are collected monthly, do not know abundance between sample dates.


Causative organism known: Yes
Causative Species/Genus: Heterocapsa rotundata (133,000 cells/L)
Data collected: 09/01/03
Heterocapsa rotundata (567,000 cells/L)
Data collected: 12/02/03
Anabaena sp. (1,770,000 cells/L)
Anabaena cf. Circinalis. Data collected: 22/07/03
Anabaena sp. (1,530,000 cells/L)
Anabaena cf. Circinalis. Data collected: 13/08/03
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:
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: