General Information

Event name: US-01-024
Nature of the harmful event:
Water Discoloration , High Phyto concentration , Seafood toxins , Mass mortalities
Event directly affected:
Natural Fish , Birds , Aquatic Mammals , Humans
Toxicity detected: Yes (Approximate range: (Approximate range: 33.4 μg/L BREVETOXINS))
Associated syndrome: NSP , Aerosolized toxins effects
Unexplained toxicity: No
Species implicated in toxin transmission (transvector): Crassostrea virginica, the Eastern Oyster.
Report the outcome of a monitoring programme: Yes (State of Florida HAB program and federal ECOHAB: Florida program.)
Event occurred before in this location: Yes (Go to
Individuals to contact: STEIDINGER, Karen A.

Location & Date

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Location: Latitude: , Longitude:
General location information: East coast of Florida, 15
HAB Area code(s): US-15
Additional location information: Offshore and inshore Gulf of Mexico from Panama City Beach to the Florida Keys up to Martin County on the east coast. This red tide of 2001 was first detected off SW Florida offshore of Johns Pass (27.7267 and -82.9767) and Sarasota (27.1335 and -82.9812)
Bloom event dates (yyyy/mm/dd): Event Date:2001-11-19
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information:


Causative organism known: Yes
Causative Species/Genus: Karenia brevis (105,000,000 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): 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:
Growth Comments
Additional Environmental information:

Toxin Assay Information

Species containing the toxin Toxin type Toxin details Max. concentration Assay type
Kit used: Type of kit used:
Additional information:
Economic losses:
Management decision:
Additional harmful effect information:
Created at 03:43 on 10 Mar 2020
Updated at 06:58 on 28 Jul 2020