General Information

Event name: US-99-003
Nature of the harmful event:
Water Discoloration , High Phyto concentration , Seafood toxins , Mass mortalities
Event directly affected:
Shellfish , Aquatic Mammals , Humans
Toxicity detected: Yes (Approximate range: 31.2 MU brevetoxin)
Associated syndrome: Aerosolized toxins effects , NSP
Unexplained toxicity: No
Species implicated in toxin transmission (transvector):
Report the outcome of a monitoring programme: Yes (Event driven.)
Event occurred before in this location: Yes
Individuals to contact: STEIDINGER, Karen A.

Location & Date

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Location: Latitude: 30.137778, Longitude: -85.751667
General location information: Off Panama City., Gulf of Mexico, Florida.
HAB Area code(s): US-16
Additional location information: Precise location: 30.1379 N - 85.7517 W. 29.6657 N - 85.2192 W to 30.3306 N - 87.1392 W.
Bloom event dates (yyyy/mm/dd): Event Date:1999-09-07
Start: 1999-08-08, End: 2000-01-12
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information:


Causative organism known: Yes
Causative Species/Genus: Gymnodinium breve (15,500,000 cells/L)
There were 3 simultaneous G. Breve red tides in FL waters in fall 1999 (NE, NW + SW Florida)
Co-Ocurring Species/Genus:
Chlorophyll concentration, if known: Off Panama City (near shore): 7.11 g chl a/L 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: 34 Current Velocity: 0
Nutrient information:
Temperature Range During Event: Max: 37 °C, Min: 13 °C
Salinity Range During Event: Max: 37, Min: 17
Bloom location in the water column: Whole column
Growth Comments Unknown.
Additional Environmental information:

Toxin Assay Information

Species containing the toxin Toxin type Toxin details Max. concentration Assay type
Oysters Brevetoxins 31.2 Bioassay-Mouse
Kit used: Type of kit used:
Additional information:
Economic losses: Closed shellfish beds - no estimate of loss.
Management decision: Followed Biotoxin Control Plan - closed shellfish haresting areas affected; opende when <20 MU.
Additional harmful effect information: Toxicity detected in oysters and in dolphins. Associated syndrom: Respiratory irritation and fish kills.
Updated at 03:13 on 14 May 2018