General Information

Event name: US-89-008
Nature of the harmful event:
Mass mortalities
Event directly affected:
Toxicity detected: No
Associated syndrome:
Unexplained toxicity: No
Species implicated in toxin transmission (transvector):
Report the outcome of a monitoring programme: Yes
Event occurred before in this location: Yes (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.-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: Pinellas and Manatee counties., Florida.
HAB Area code(s): US-16
Additional location information:
Bloom event dates (yyyy/mm/dd): Start: 1989-03-23, End: 1989-05-05
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information:


Causative organism known: Yes
Causative Species/Genus: Gymnodinium breve (850,000 cells/L)
coastal surface water,up to 10 miles out, offshore
Gymnodinium breve (12,700 cells/L)
surface water samples
Gymnodinium breve (1,000 - 14 cells/L)
offshore bottom water samples
Co-Ocurring Species/Genus:
Chlorophyll concentration, if known: µg/l
Additional bloom information:
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
Additional Environmental information: Occurred in coastal and neashore waters with wide salinity (>25 ) ranges and nearshore temperatures of 18 to 27.5 C.

Toxin Assay Information

Species containing the toxin Toxin type Toxin details Max. concentration Assay type
Kit used: No Type of kit used:
Additional information:
Economic losses:
Management decision: Shellfish bans - 3/24 - 5/5 - Pinellas and Manatee counties
Additional harmful effect information: Dead fish - offshore and beach (Gulfport beach was closed on 4/9) Respiratory and eye irritation. Shellfish harvesting bans.