General Information

Event name: US-94-011
Nature of the harmful event:
Water Discoloration , Mass mortalities , Other ( Respiratory irritation.)
Event directly affected:
Toxicity detected: No
Associated syndrome: NSP , Aerosolized toxins effects
Unexplained toxicity: No
Species implicated in toxin transmission (transvector):
Report the outcome of a monitoring programme: Yes
Event occurred before in this location: Yes (No occurrence in 1993; September 1992-January 1993; January-February 1991; February-March, October-November 1990; March-May 1989; October-December 1988; January/February, May-July, September/October 1987; September-December 1986; September-December 1985; January-March, May-August, 1984; January/February, October-December 1983; January-April, July-October 1982; September/October 1981; January/Febraury, June-November 1980; and before.)
Individuals to contact: STEIDINGER, Karen A.

Location & Date

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Location: Latitude: , Longitude:
General location information: , Florida.
HAB Area code(s): US-15 US-16
Additional location information: Pinellas to Collier County (1994) Area 16; Collier to Monroe County (1995) Area 16; Monroe to Palm Beach County (1995) Area 15.
Bloom event dates (yyyy/mm/dd): Start: 1994-09-10, End: 1995-02-26
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information: 16 September 1994 through February 1995 and on-going (as of 26 February 1995) in southwest Florida.


Causative organism known: Yes
Causative Species/Genus: Gymnodinium breve (> 30,000,0 cells/L)
Co-Ocurring Species/Genus:
Chlorophyll concentration, if known: µg/l
Additional bloom information: Inshore and coastal surface up to 12 miles offshore.
Event-related bibliography:

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: 28 °C, Min: 16 °C
Salinity Range During Event: Max: 36, Min: 26
Bloom location in the water column:
Growth: Advected
Growth Comments Advected population from offshre waters between Tampa Bay and Charlotte Harbor. In January-February, G. breve bloom in southwest Florida offshore shelf waters entrined and transported south. Bloom concentrations found on the Atlantic side in February. A
Additional Environmental information: Occurred in nearshore and shelf waters.

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: Shellfish harvest bans due to Gymnodinium breve red tide - lower Tampa Bay, 21 September 1994 to 25 January 1995; Boca Ciega, 26 September 1994 to 25 January 1995; new pass fall closure due to rainfall, kept closed until 27 January 1995; Lemon Bay fall cl
Additional harmful effect information: Dead fish - inshore and offshore. Water discoloration brownish-red in some areas. Respiratory irritation from Pinellas to Lee County.
Updated at 03:30 on 17 May 2018