General Information

Event name: US-05-008
Nature of the harmful event:
High Phyto concentration
Event directly affected:
Toxicity detected: No
Associated syndrome:
Unexplained toxicity:
Species implicated in toxin transmission (transvector):
Report the outcome of a monitoring programme: No
Event occurred before in this location:
Individuals to contact: RABALAIS, Nancy

Location & Date

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Location: Latitude: , Longitude:
General location information: Terrebone Bay, Louisiana,
HAB Area code(s): US-17
Additional location information: Cross-shelf research transect SSE of Terrebone Bay, Louisiana. Begins at 29.0567 degrees North 90.5317 degrees West, and ends at 28.7583 degrees North and 90.2345 degrees West
Bloom event dates (yyyy/mm/dd):
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information: The data below represent cell concentrations of HAB species at or above 10^5 cells/liter (with the exception of Dinophysis and Prorocentrum which are reported at or above 10^3, and Alexandrium monilatum and Karenia brevis which are reported when they are detected at any concentration) encountered in routine sampling for the period Jan. - Dec. 2005, and were not associated with a particular bloom event. Cell concentrations were averaged over the three stations in the transect to generate an average concentration for a single sample date.


Causative organism known: Yes
Causative Species/Genus: Heterocapsa rotundata (1.3x10^5 cells/L)
Prorocentrum gracile (2.6x10^3 cells/L)
Prorocentrum minimum (1.7x10^5 cells/L)
Pseudo-nitzschia sp. (1.3x10^5 cells/L)
Hemidiscus cuneiformis Wallich 1860 ( cells/L)
Co-Ocurring Species/Genus:
Chlorophyll concentration, if known: µg/l
Additional bloom information: Other species detected include: H. rotundata, P. Minimum, Prorocentrum scutellum, Prorocentrum gracile, P. gracile, P. Scutellum, P. compressum, Prorocentrum micans, Alexandrium monilatum, and Karenia brevis.
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: 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: Type of kit used:
Additional information:
Economic losses:
Management decision:
Additional harmful effect information: