General Information

Event name: US-02-010
Nature of the harmful event:
High Phyto concentration , Seafood toxins , Mass mortalities
Event directly affected:
Natural Fish , Humans
Toxicity detected: Yes (Approximate range: 23.1-113.6 MU)
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
Individuals to contact: STEIDINGER, Karen A.

Location & Date

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Location: Latitude: 29.093056, Longitude: -83.135556
General location information: Florida Gulf Coast, Florida, Gulf of Mexico.
HAB Area code(s): US-16
Additional location information: Sustained bloom in southwest FL from January 4, 2002 to Feb. 13 2003. More short lived bloom in the Panhandle region in Sept 2002.
Bloom event dates (yyyy/mm/dd):
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information:


Causative organism known: Yes
Causative Species/Genus: Karenia brevis (2,920,000 cells/L)
Co-Ocurring Species/Genus: Karenia mikimotoi (40,000 cells/L)
Chlorophyll concentration, if known: 5.9-22.8 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): 7.6-10.2 Wind velocity:
Temperature (°C): 27.7-28.1 Oxygen saturation %: Current Direction:
Sechhi disk (m): Salinity: 35.3-36.0 Current Velocity: 0
Nutrient information:
Temperature Range During Event: Max: °C, Min: °C
Salinity Range During Event:
Bloom location in the water 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 113.6 Bioassay-Mouse
Kit used: Type of kit used:
Additional information:
Economic losses: closed shellfish beds-no estimate of loss
Management decision: followed Biotoxin Control Plan-closed shellfish harvesting area affected; opened when <20 MU
Additional harmful effect information:
Updated at 07:18 on 28 Jul 2020