General Information

Event name: US-14-012
Nature of the harmful event:
High Phyto concentration , Seafood toxins
Event directly affected:
Natural Fish
Toxicity detected: Yes
Associated syndrome: NSP , Aerosolized toxins effects
Unexplained toxicity: No
Species implicated in toxin transmission (transvector): no documented human illnesses
Report the outcome of a monitoring programme: Yes (FWC/FWRI HAB Monitoring Program)
Event occurred before in this location: Yes (sporadic (i.e. not annually))
Individuals to contact: HUBBARD, Katherine

Location & Date

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Location: Latitude: 29.016667, Longitude:
General location information: West Coast, Florida
HAB Area code(s): US-16
Additional location information: bloom spanned inshore/offshore waters but was spatially and temporally patchy. Fish kill in Cedar Key (Levy/Dixie counties), phyto in Sarasota, Charlotte, Lee, Collier counties.
Bloom event dates (yyyy/mm/dd): Start: 2014-08-16, End: 2014-11-24
Quarantine levels dates (yyyy/mm/dd): First detection: 2014-09-05, End: 2014-11-07
Additional date-related information: 8/16/14-10/1/14, 10/30/14-11/24/14


Causative organism known: Yes
Causative Species/Genus: Karenia brevis (5547500 cells/L)
Dinophyceae. NSP producer
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: 31 °C, Min: 19.7 °C
Salinity Range During Event: Max: 36.1, Min: 17.1
Bloom location in the water column:
Growth: Advected
Growth Comments bloom was patchy and originated offshore
Additional Environmental information: DO Range: 3.3-8.6

Toxin Assay Information

Species containing the toxin Toxin type Toxin details Max. concentration Assay type
Hard Clam, Mercenaria mercenaria Brevetoxins <20MU/100g Bioassay-Mouse
Eastern oyster, Crassostrea virginica Brevetoxins 29MU/100g Bioassay-Mouse
Kit used: Type of kit used:
Additional information: Shellfish harvest is banned when K. brevis exceed 5,000 cells/L. Areas are reopened when K. brevis is <5,000 cells/L and shellfish are <20MU/100g. In this case, harvest was closed for cells concentrations but no toxicity was measured when shellfish were tested to re-open.
Economic losses:
Management decision: shellfish harvest closure
Additional harmful effect information:
Created at 07:54 on 8 Feb 2017
Updated at 08:15 on 29 Jul 2020