General Information

Event name: US-06-004
Nature of the harmful event:
High Phyto concentration , Seafood toxins , Mass mortalities
Event directly affected:
Planktonic life , Natural Fish , Aquatic Mammals , Humans
Toxicity detected: Yes (Approximate range: 21.68-35.99 MU/100g N. FL see back page)
Associated syndrome: NSP , Aerosolized toxins effects
Unexplained toxicity: No
Species implicated in toxin transmission (transvector):
Report the outcome of a monitoring programme: Yes (State of Florida Redtide Monitoring Program)
Event occurred before in this location: Yes (Almost annually between Pinellas and Lee Counties)
Individuals to contact: TRUBY, Earnest W. , HEIL, Cynthia A.

Location & Date

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Location: Latitude: , Longitude:
General location information: Southwest Florida, Gulf of Mexico
HAB Area code(s): US-16
Additional location information:
Bloom event dates (yyyy/mm/dd): Start: 2006-01-02, End: 2006-02-03
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information: Bloom started in 2005


Causative organism known: Yes
Causative Species/Genus: Karenia brevis (205,000 cells/L)
Co-Ocurring Species/Genus: Karenia mikimotoi (2000 cells/L)
Chlorophyll concentration, if known: µg/l
Additional bloom information:
Event-related bibliography: Foley, A., Stacy, B. A., Schueller, P., Flewelling, L. J., Schroeder, B., Minch, K., Fauquier, D. A., Foote, J. J., Manire, C., Atwood, K. E., Granholm, A. A., Landsberg, J. H., 2019. Assessing Karenia brevis red tide as a mortality factor of sea turtles in Florida. Dis. Aquat. Org. 132, 109124.

Environmental Conditions

Weather: Turbidity (NTU): Wind direction:
Stratified water: Oxygen content (nL/L): 6.68 mg/L Wind velocity:
Temperature (°C): 22.15 Oxygen saturation %: Current Direction:
Sechhi disk (m): Salinity: 35.61 Current Velocity: 0
Nutrient information:
Temperature Range During Event: Max: 25 °C, Min: 20 °C
Salinity Range During Event: Max: 36, Min: 34
Bloom location in the water column: Whole column
Growth: Advected
Growth Comments
Additional Environmental information:

Toxin Assay Information

Species containing the toxin Toxin type Toxin details Max. concentration Assay type
Karenia brevis Brevetoxins 35.99 MU/100g* Bioassay-Mouse
Kit used: No Type of kit used:
Additional information: Multiple species (fish, manatees, birds, turtles) ELISA data available.
Economic losses: Closed shellfish beds, no estimate of loss.
Management decision: Followed biotoxin control plan-closed shellfish harvesting areas affected; opened when <20 MU.
Additional harmful effect information: * These results are from the northern Gulf of Mexico from 9/1/06 to 18/1/06 resulting from the 2005 red tide. No quarantine levels of counts were found during this period. Latitude 29.3615 to 30.3933. Longitude -83.1898 to -86.5241.
Updated at 07:36 on 29 Jul 2020