General Information

Event name: US-03-010
Nature of the harmful event:
Water Discoloration , High Phyto concentration , Seafood toxins , Mass mortalities , Other ( human respiratory irritation)
Event directly affected:
Shellfish , Humans
Toxicity detected: Yes (Approximate range: 20.5-46.3 MU brevetoxin.)
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 (In the last ten years, it has occurred in 8 years.)
Individuals to contact: TRUBY, Earnest W. , HEIL, Cynthia A.

Location & Date

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Location: Latitude: 28.304167, Longitude: -82.838889
General location information: Northwest Florida., Florida, Gulf of Mexico.
HAB Area code(s): US-16
Additional location information: From : 28.3046 to 30.1822 N ; 82.8389 to 85.8178 W. Bloom not continuous.
Bloom event dates (yyyy/mm/dd): Start: 2003-09-14,
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information: Final date: continues into 2004.


Causative organism known: Yes
Causative Species/Genus: Karenia brevis (883,000 cells/L)
Co-Ocurring Species/Genus: Karenia papilionacea (88,300 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: No Oxygen content (nL/L): 9.9 Wind velocity: 8
Temperature (°C): 17.0 Oxygen saturation %: Current Direction:
Sechhi disk (m): Salinity: 17.2 Current Velocity: 0
Nutrient information:
Temperature Range During Event: Max: 30 °C, Min: 10 °C
Salinity Range During Event: Max: 33, Min: 17
Bloom location in the water column: Whole column
Growth: Advected
Growth Comments
Additional Environmental information: Classically the redtide starts off central Florida. Wind velocity: 8 mph.

Toxin Assay Information

Species containing the toxin Toxin type Toxin details Max. concentration Assay type
Karenia brevis Brevetoxins 46.3 MU Bioassay-Mouse
Kit used: Type of kit used:
Additional information:
Economic losses: Closed shellfish beds-no estimate.
Management decision: Followed Biotoxin Control Plan-closed shellfish harvesting areas affected; opened when <20 MU.
Additional harmful effect information:
Updated at 07:09 on 29 Jul 2020