General Information

Event name: US-99-002
Nature of the harmful event:
Water Discoloration , High Phyto concentration , Mass mortalities
Event directly affected:
Toxicity detected: Yes
Associated syndrome: NSP
Unexplained toxicity: No
Species implicated in toxin transmission (transvector):
Report the outcome of a monitoring programme: Yes (Event driven.)
Event occurred before in this location: Yes (1980. Yes, blooms transported up FL east coast by Gulf Stream.)
Individuals to contact: STEIDINGER, Karen A.

Location & Date

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Location: Latitude: 30.381389, Longitude: -81.408889
General location information: Atlantic Beach, Florida., Florida, SE USA.
HAB Area code(s): US-15
Additional location information: NE Florida, Duval to Volusia Counties.
Bloom event dates (yyyy/mm/dd): Event Date:1999-10-05
Start: 1999-09-22, End: 1999-10-21
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information:


Causative organism known: Yes
Causative Species/Genus: Gymnodinium breve (1,870,000 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: Light rain. Turbidity (NTU): Wind direction: W
Stratified water: No Oxygen content (nL/L): Wind velocity:
Temperature (°C): 21.1 Oxygen saturation %: Current Direction:
Sechhi disk (m): Salinity: 33 Current Velocity: 0
Nutrient information:
Temperature Range During Event: Max: 27 °C, Min: 21 °C
Salinity Range During Event: Max: 36, Min: 25
Bloom location in the water column: Whole column
Growth: Advected
Growth Comments
Additional Environmental information: Throughout water column, surface samples counted. Temp: 70 F =21.1 C. Wind velocity: Calm.

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: Not known.
Management decision: Monitor coastal waters for G. Breve to forecast respiratory irritation & text closest shellfish beds for toxins.
Additional harmful effect information: Associated syndrom: Respiratory irritation, fish kills.
Updated at 08:32 on 29 Jul 2020