General Information

Event name: US-13-010
Nature of the harmful event:
Water Discoloration , High Phyto concentration , Seafood toxins , Mass mortalities
Event directly affected:
Planktonic life , Natural Fish , Birds , Shellfish , Aquatic Mammals
Toxicity detected: Yes (Approximate range: 20.67-205.34 g / 100 g shelfish)
Associated syndrome: NSP , Aerosolized toxins effects
Unexplained toxicity: No
Species implicated in toxin transmission (transvector): no human intoxications
Report the outcome of a monitoring programme: Yes (FWC/FWRI HAB Monitoring Program)
Event occurred before in this location: Yes (Historically, Karenia brevis blooms occur in SW Florida shelf almost annually usually beginning in summer or fall.)
Individuals to contact: SCOTT, Paula

Location & Date

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Location: Latitude: 27.821667, Longitude:
General location information: SW Florida,
HAB Area code(s): US-16
Additional location information: Gulf of Mexico (including inshore bays, estuaries and sounds) 106 miles n to s and 40 miles w to e; patchy distribution throughout the spring and fall.
Bloom event dates (yyyy/mm/dd): Start: 2013-09-27, End: 2013-12-02
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information:


Causative organism known: Yes
Causative Species/Genus: Karenia brevis (1,821,000 cells/L)
Co-Ocurring Species/Genus:
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): Wind velocity:
Temperature (°C): 24.04 Oxygen saturation %: Current Direction:
Sechhi disk (m): Salinity: 34.56 Current Velocity:
Nutrient information:
Temperature Range During Event: Max: 37.4 °C, Min: 12.3 °C
Salinity Range During Event: Max: 42.4, Min: 19.3
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
clams, oysters Brevetoxins 205.34 g/100g Bioassay-Mouse
Kit used: No Type of kit used:
Additional information: all clams and oysters that were released from quarantine harvest was <20 g/100 g shellfish
Economic losses: unknown
Management decision: shellfish harvesting area closures until Karenia brevis cell counts fell below 5,000 cels/L and shellfish NSP fell below 20 g/100g
Additional harmful effect information: reports of respiratory irritation throughout affected bloom areas
Created at 07:56 on 6 Jan 2015
Updated at 08:14 on 29 Jul 2020