General Information

Event name: US-22-009
Nature of the harmful event:
Water Discoloration , High Phyto concentration , Seafood toxins , Mass mortalities
Event directly affected:
Planktonic life , Natural Fish , Birds , Other Terrestrial , Shellfish , Aquatic Mammals
Toxicity detected: Yes (Approximate range: 1.2-3.2 ppm)
Associated syndrome: NSP
Unexplained toxicity: No
Species implicated in toxin transmission (transvector): Mercenaria mercenaria and Crassostrea virginia
Report the outcome of a monitoring programme: Yes (Florida Fish and Wildlife Conservation Commission-Fish and Wildlife Research Institute /Florida Department of Agriculture and Consumer Services)
Event occurred before in this location: Yes (annually)
Individuals to contact: HUBBARD, Katherine

Location & Date

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Location: Latitude: , Longitude:
General location information: Gulf of Mexico, Southwest Florida
HAB Area code(s): US-16
Additional location information:
Bloom event dates (yyyy/mm/dd): Event Date:2022-10-17
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information: Bloom is ongoing as of 4/5/23


Causative organism known: Yes
Causative Species/Genus: Karenia brevis (388,400,000 cells/L)
On 11/30/22
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: Oxygen content (nL/L): Wind velocity:
Temperature (°C): Oxygen saturation %: Current Direction:
Sechhi disk (m): Salinity: Current Velocity:
Nutrient information:
Temperature Range During Event: Max: 27.78 °C, Min: 11.4 °C
Salinity Range During Event: Max: 38.92, Min: 23.12
Bloom location in the water column: Whole column
Growth: Advected
In situ
Growth Comments
Additional Environmental information: Blooms were patchy and extensive, and occurred in inland, coastal, and offshore areas along the southwest coast of Florida

Toxin Assay Information

Species containing the toxin Toxin type Toxin details Max. concentration Assay type
Mercenaria mercenaria Brevetoxins 3.2 ppm ELISA
Kit used: Yes Type of kit used: MARBIONC
Additional information:
Economic losses:
Management decision: Per the NSSP closure levels via ELISA are >1.6 ppm for clams (Mercenaria mercenaria) and >1.8 ppm for oysters (Crassostrea virginia)
Additional harmful effect information:
Created at 05:53 on 5 Apr 2023