General Information

Event name: US-05-004
Nature of the harmful event:
Water Discoloration , High Phyto concentration , Seafood toxins , Mass mortalities
Event directly affected:
Natural Fish , Shellfish , Aquatic Mammals , Humans
Toxicity detected: Yes (Approximate range: 20.63-82.44 MU/100 g)
Associated syndrome: NSP , Aerosolized toxins effects
Unexplained toxicity:
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 (Occurred last year, but only in the Cedar Key area and only for a month)
Individuals to contact: TRUBY, Earnest W. , HEIL, Cynthia A.

Location & Date

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Location: Latitude: 28.160000, Longitude: -82.845556
General location information: Northwest Florida, Gulf of Mexico
HAB Area code(s): US-16
Additional location information:
Bloom event dates (yyyy/mm/dd): Start: 2005-07-04, End: 2005-12-19
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information:


Causative organism known: Yes
Causative Species/Genus: Karenia brevis (4,836,000 cells/L)
Co-Ocurring Species/Genus: Karenia mikimotoi (367,000 cells/L)
Chlorophyll concentration, if known: 1.01-101.99 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: Yes Oxygen content (nL/L): 7.10 Wind velocity: 03
Temperature (°C): 18.8 Oxygen saturation %: Current Direction:
Sechhi disk (m): Salinity: 29.8 Current Velocity: 0
Nutrient information:
Temperature Range During Event: Max: 32 °C, Min: 12 °C
Salinity Range During Event: Max: 36, Min: 18
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
Karenia brevis Brevetoxins 82.44 MU/100g Bioassay-Mouse
Kit used: No Type of kit used:
Additional information: fish, mammals, birds-results pending.
Economic losses: Closed shellfish beds, no estimate of loss.
Management decision: followed Biotoxin Control Plan-closed shellfish harvesting areas affected; opened when <20 MU.
Additional harmful effect information:
Updated at 07:17 on 29 Jul 2020