General Information

Event name: US-19-020
Nature of the harmful event:
Water Discoloration , High Phyto concentration , Seafood toxins
Event directly affected:
Natural Fish , Birds , Aquatic Mammals , Humans
Toxicity detected: Yes (Approximate range: 88ppm ELISA, 50units/100g MBA)
Associated syndrome: NSP , Aerosolized toxins effects
Unexplained toxicity: No
Species implicated in toxin transmission (transvector):
Report the outcome of a monitoring programme: Yes (FWC-FWRI HAB Monitoring Program)
Event occurred before in this location: Yes (Annually)
Individuals to contact: HUBBARD, Katherine

Location & Date

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Location: Latitude: , Longitude:
General location information: Southwest Florida (Sarasota, Charlotte, Lee, Collier, and Monroe counties), West coast of Florida
HAB Area code(s): US-16
Additional location information: bloom primarily spanned inshore and >15 miles offshore but was spatially and temporally patchy
Bloom event dates (yyyy/mm/dd): Start: 2019-09-30, End: 2019-12-07
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information: 10/2/17 - 7/4/2019, 9/30/2019 - 12/7/2019


Causative organism known: Yes
Causative Species/Genus: Karenia brevis (77,295,560 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): Oxygen saturation %: Current Direction:
Sechhi disk (m): Salinity: Current Velocity:
Nutrient information:
Temperature Range During Event: Max: °C, Min: °C
Salinity Range During Event:
Bloom location in the water column: Whole column
Growth: Advected
Growth Comments
Additional Environmental information: the bloom was patchy in time/space

Toxin Assay Information

Species containing the toxin Toxin type Toxin details Max. concentration Assay type
Mercenaria mercenaria Brevetoxins 80 ppm ELISA
Mercenaria mercenaria Brevetoxins 50.7 units Bioassay-Mouse
Kit used: Type of kit used:
Additional information: max values observed were in hard clams; Eastern oysters were screened as well
Economic losses:
Management decision: seasonal closure already in place; testing conducted prior to reopening. Closure duration varied by location.
Additional harmful effect information:
Created at 04:57 on 8 Apr 2020
Updated at 08:35 on 29 Jul 2020