General Information

Event name: US-06-003
Nature of the harmful event:
Water Discoloration , High Phyto concentration , Seafood toxins , Mass mortalities
Event directly affected:
Planktonic life , Natural Fish , Shellfish , Aquatic Mammals , Humans
Toxicity detected: Yes (Approximate range: 18.65-166.21 MU/100g)
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: HEIL, Cynthia A. , TRUBY, Earnest W.

Location & Date

[View larger map]
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: 2006-06-15, End: 2006-12-26
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information: Bloom continued into 2007.


Causative organism known: Yes
Causative Species/Genus: Karenia brevis (125000000 cells/L)
Co-Ocurring Species/Genus: Karenia papilionacea (133000 cells/L)
Chlorophyll concentration, if known: 0.41-9.56 µg/l
Additional bloom information: We have data for > 3 micron size fraction chlorophyll a.
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): 7.9 mg/L Wind velocity:
Temperature (°C): 31.4 Oxygen saturation %: Current Direction:
Sechhi disk (m): Salinity: 30.85 Current Velocity: 0
Nutrient information:
Temperature Range During Event: Max: 32 °C, Min: 17 °C
Salinity Range During Event: Max: 38, Min: 22
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 166.21 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 harvesting areas, no estimate of loss.
Management decision: Followed Biotoxin Control Plan-closed shellfish harvesting areas affected; opened when < 20 MU
Additional harmful effect information:
Updated at 07:33 on 29 Jul 2020