General Information

Event name: US-17-016
Nature of the harmful event:
Water Discoloration , High Phyto concentration , Seafood toxins , Mass mortalities
Event directly affected:
Natural Fish , Aquatic Mammals
Toxicity detected: Yes (Approximate range: < or = to 39.8 micrograms per gram shellfish tissue)
Associated syndrome: NSP , Aerosolized toxins effects
Unexplained toxicity: No
Species implicated in toxin transmission (transvector): In March 2017, recreationally harvested gastropods resulted in documented human illnesses (likely conch or whelk, but no meal remnants remained for testing)
Report the outcome of a monitoring programme: Yes (FWC/FWRI HAB Monitoring Program)
Event occurred before in this location: Yes (Annually)
Individuals to contact: HUBBARD, Katherine

Location & Date

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Location: Latitude: 27.000000, Longitude: -81.000000
General location information: Southwest Florida (Pinellas, Hillsborough, Manatee, Sarasota, Charlotte, Lee, Collier, Monroe counties), West Coast of Florida
HAB Area code(s): US-16
Additional location information: bloom primarily spanned inshore and coastal waters but was spatially and temporally patchy
Bloom event dates (yyyy/mm/dd): End: 2017-06-13
Quarantine levels dates (yyyy/mm/dd): First detection: 2017-07-07,
Additional date-related information: 17-18 season 10/2/17-present 9/9/16 1st event


Causative organism known: Yes
Causative Species/Genus: Karenia brevis (11200000 cells/L)
Max on 2/1/17; 6,479,760 on 12/26/17 (2nd bloom); NSP Producer
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: °C, Min: °C
Salinity Range During Event:
Bloom location in the water column: Whole column
Growth: Advected
Growth Comments Blooms were patchy and extensive, and occurred in inland and coastal areas, including Sarasota Bay, Charlotte Harbor, and along the adjoining coastal areas.
Additional Environmental information:

Toxin Assay Information

Species containing the toxin Toxin type Toxin details Max. concentration Assay type
Oysters (Crassostrea virginica Brevetoxins 39.8 ug/g shellfish ELISA
Kit used: Yes Type of kit used: MARBIONC
Additional information: Shellfish harvest is banned when K. brevis exceed 5,000 cells/L. Areas are reopened when K. brevis is <5,000 cells/L and shellfish are <20MU/100g. In this case, harvest remained closed between bloom events except in authorized use zones.
Economic losses:
Management decision: shellfish harvest closure remained in place
Additional harmful effect information:
Created at 08:34 on 23 Apr 2018
Updated at 03:12 on 14 May 2018