General Information

Event name: US-90-012
Nature of the harmful event:
Mass mortalities
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 (Feb-March 1990, March-May 1989, Oct-Dec 1988, Jan/Feb, May-July, Sept/Oct 1987, Sept-Dec 1986, Sept-Dec 1985, Jan-March, May-Aug 1984, Jan/Feb, Oct-Dec 1983, Jan-Apr, 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: Sarasota to Collier County., Florida.
HAB Area code(s): US-16
Additional location information:
Bloom event dates (yyyy/mm/dd): Start: 1990-10-18, End: 1990-11-22
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information:


Causative organism known: Yes
Causative Species/Genus: Gymnodinium breve ( cells/L)
Co-Ocurring Species/Genus:
Chlorophyll concentration, if known: µg/l
Additional bloom information: Coastal surface water samples ranged from negative to 6,300 cells/l; offshore (up to 20 nm out) surface water samples had a few live cells and immobile but potential cells (samples got too warm before observation).
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: >32 Current Velocity: 0
Nutrient information:
Temperature Range During Event: Max: 30 °C, Min: 28 °C
Salinity Range During Event:
Bloom location in the water column:
Growth: Advected
Growth Comments Advected population from offshore waters.
Additional Environmental information: Occurred in coastal and nearshore water.

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 ban 10/26 - 11/22 Lemon Bay and Gasparilla Sound.
Additional harmful effect information: Dead fish - offshore about20 miles off Lee County and 'massive'fish kill' reported by SEAMAP cruise between 10 - 20 nautical miles offshore from Venice to Sanibel. Respiratory irritation and dead fish on Gasparilla Island.
Updated at 06:21 on 2 Nov 2020