General Information

Event name: US-05-007
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: Yes (A similar event occurred in this area in Nov. 1996)
Individuals to contact: RABALAIS, Nancy

Location & Date

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Location: Latitude: , Longitude:
General location information: Lake Borgne/Mississippi Sound area, South of St. Joseph Point
HAB Area code(s): US-17
Additional location information: Coastal area off of the Mississippi/Louisiana border
Bloom event dates (yyyy/mm/dd):
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information: On 11/8/05 LUMCON was contacted by the Dept. of Health and Hospitals Molluscan Shellfish Division that there had been reports of Karenia brevis detected in Mississippi waters close to the Louisiana border. DHH wanted to collect water samples near the oyster beds in that area and since their New Orleans lab was not operational post Hurricane Katrina, they asked LUMCON to look at the water samples. LUMCON received four batches of samples between 11/9/05 and 12/1/05. Abundances of K. brevis were close to the 5,000 cells/liter shut down level only in the first batch of samples, but then barely at detection limits after that. No discolored water was observed in this area during this time period.


Causative organism known: Yes
Causative Species/Genus: Karenia brevis (1.7x10^4 cells/L)
Karenia brevis (8.2x10^3 cells/L)
Karenia brevis (1.0x10^2 cells/L)
Karenia brevis (2.0x10^2 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: 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: