General Information

Event name: US-99-005
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: Yes. From respiratory irritation and known symptoms.)
Associated syndrome: Aerosolized toxins effects , NSP
Unexplained toxicity: No
Species implicated in toxin transmission (transvector):
Report the outcome of a monitoring programme: Yes
Event occurred before in this location: Yes (Almost annual from Pinellas to Lee Counties. see ICES report for 1998 blooms.)
Individuals to contact: STEIDINGER, Karen A.

Location & Date

[View larger map]
Location: Latitude: , Longitude:
General location information: off Sarasota, Florida., Gulf of Mexico, Florida.
HAB Area code(s): US-16
Additional location information: 27.0127N - 82.5070W From 27.6133 N 82.390 W to 25.9133 N 81.7124 W and possibly to Florida Keys.
Bloom event dates (yyyy/mm/dd): Event Date:1999-10-05
Start: 1999-08-31,
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information: Final date: ongoing


Causative organism known: Yes
Causative Species/Genus: Gymnodinium breve (5,350,000 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: No Oxygen content (nL/L): Wind velocity:
Temperature (°C): Oxygen saturation %: Current Direction:
Sechhi disk (m): Salinity: Current Velocity: 0
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: Presence of G. Breve above background closed shellfish beds in 3 counties.
Additional harmful effect information: Associated syndrom: Respiratory irritation and fish kills, possible manatee deaths.
Updated at 08:28 on 29 Jul 2020