General Information

Event name: US-04-016
Nature of the harmful event:
High Phyto concentration
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.)
Individuals to contact:

Location & Date

[View larger map]
Location: Latitude: , Longitude:
General location information: Lake Pontchartrain, Louisiana
HAB Area code(s): US-17
Additional location 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. Concentrations of HAB species are reported at 10^5 cells/liter, with the exception of Prorocentrum which are reported at 10^4 and Anabaena spp. which are reported at 10^6. Data is from surface samples collected during routine sampling and were not associated with a particular bloom event.
Bloom event dates (yyyy/mm/dd):
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information:


Causative organism known: Yes
Causative Species/Genus: Heterocapsa rotundata (5,178,999 cells/L)
Date collected: 1/26/2004
Heterocapsa rotundata (437,465 cells/L)
Date collected: 3/9/2004
Mesodinium rubrum (171,509 cells/L)
Date collected: 3/9/2004
Prorocentrum minimum (279,073 cells/L)
Date collected: 10/20/2004
Heterocapsa rotundata (494,034 cells/L)
Date collected: 12/8/2004
Co-Ocurring Species/Genus:
Chlorophyll concentration, if known: µg/l
Additional bloom information: heterocapsa rotundata
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: