General Information

Event name: US-95-016
Nature of the harmful event:
Water Discoloration , Seafood toxins , Mass mortalities
Event directly affected:
Toxicity detected: Yes
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 (Sept 1994 into 1995; Sept 1992-Jan 1993; Jan-Feb 1991; Feb-Mar, Oct-Nov 1990; March-May 1989; Oct-Dec 1988; Jan/Feb, May-July, Sept/Oct, 1987; Sept-Dec 1986, Sept-Dec 1985, Jan-Mach, May-Aug, 1984, Jan/Feb, Oct-Dec 1983; Jan-April, July-Oct, 1982; Sept/Oct, 1981; Jan/Feb, June-Nov, 1980; and before.)
Individuals to contact: STEIDINGER, Karen A.

Location & Date

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Location: Latitude: , Longitude:
General location information: Monroe County and Palm Beach County., Florida.
HAB Area code(s): US-15 US-16
Additional location information: Bay to Monroe County (1995) Area 16, Monroe to Palm Beach County (1995) Area 15. Started 1994-09-16
Bloom event dates (yyyy/mm/dd): End: 1996-04-10
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information: September 16, and on-going (as of 10/4/96) in Florida west coast waters.


Causative organism known: Yes
Causative Species/Genus: Gymnodinium breve (10,000,000 cells/L)
Co-Ocurring Species/Genus:
Chlorophyll concentration, if known: µg/l
Additional bloom information: Inshore and coastal surface water samples up to 12 miles offshore had cell concentrations ranging from negative to 10,000,000 cells/L
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: °C, Min: °C
Salinity Range During Event:
Bloom location in the water column:
Growth: Advected
Growth Comments Advected population from offshore waters between Tampa Bay and Charlotte Harbor. In January-February, G. breve bloom in southwest Florida offshore shelf waters entrained and transported south, as in 1994. Brevetoxins detected in seawater on the Atlantic s
Additional Environmental information: Occurred in nearshore and shelf waters with wide salinity and temperature ranges, > 10 o/oo and 15 C differential.

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 dueo to Gymnodinium breve red tide - lower Tampa Bay, 4/24/95 to 1/21/96; Boca Ciega, 4/24/95 to 10/21/95; New Pass, 4/20/95 to 1/20/96; Lemon Bay, 4/12/94 to 11/8/95 to 1/20/96; Gasparilla Sound, 4/13/95 to 6/9/95, 8/22/95 to 10/15
Additional harmful effect information:
Updated at 03:06 on 14 May 2018