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Red Tide Current Status

Midweek Red Tide Status Update (February 21, 2018)

A patchy bloom of the Florida red tide organism, Karenia brevis, persists in Southwest Florida.

In Southwest Florida over the past week, K. brevis was observed at background to low concentrations in three samples collected from or offshore of Lee County, and very low to medium concentrations in two samples collected from offshore of Monroe County.

In Northwest Florida over the past week, K. brevis was observed at background concentrations in one sample collected from Franklin County.

Additional samples collected throughout Florida over the past week did not contain K. brevis.

Fish kills were reported in Monroe County eight miles south of Sandy Key (2/15), in Florida Bay (2/16), and offshore of Marathon Key (2/16 and 2/19). Respiratory irritation was also reported in Monroe County, offshore of Marathon Key (2/19).  Forecasts by the USF-FWC Collaboration for Prediction of Red TidesExternal Website for Pinellas to Monroe counties predict northern, alongshore transport of surface waters and southern, onshore transport of subsurface waters over the next three days.

View Southwest Coast map Adobe PDF (PDF 396KB) (February 21, 2018)

Red Tide Status Report (February 16, 2018)

The Florida red tide organism, Karenia brevis, persists in Southwest Florida.

In Southwest Florida over the past week, K. brevis was observed at background concentrations in one sample collected from Pinellas County, background to low concentrations in three samples collected from or offshore of Lee County, very low concentrations in one sample collected from Collier County, and background to very low concentrations in six samples collected from or offshore of Monroe County.

Additional samples collected throughout Florida over the past week did not contain K. brevis.

Fish kills were reported in Monroe County near Bamboo Bank (2/13) and approximately 8 miles south of Sandy Key (2/15). Forecasts by the USF-FWC Collaboration for Prediction of Red TidesExternal Website for Pinellas to Monroe counties predict net western transport of surface waters and southeastern transport of subsurface waters over the next three days.

View Statewide map Adobe PDF (PDF 397KB) (February 16, 2018)

Regional Status Reports and Maps (February 16, 2018)

Southwest coast report Adobe PDF (PDF 115KB) and map Adobe PDF (PDF 329KB)
East coast report Adobe PDF (PDF 56KB) and map Adobe PDF (PDF 288KB)
Northwest coast report Adobe PDF (PDF 42KB) and map Adobe PDF (PDF 485KB)

To see detailed information on this week's samples, view the current Statewide Google Earth map for February 16, 2018External Website. 

By using Google Earth, you can zoom in to specific locations and click on stations to see detailed information, including sample date and cell concentration. You must have Google Earth installed on your computer to view this map; the software can be downloaded from the Google Earth websiteExternal Website

The FWRI Red Tide Status Line is now available to callers throughout the state. FWRI updates the recording each Friday by 5 p.m. Red Tide Status Line: 866-300-9399 (toll-free inside Florida only); 727-552-2448 (outside Florida).

Reports are updated on Friday afternoon except during holidays, in which case the report will be released on the closest day. Additional information, if available, is provided on Wednesday afternoon. To receive an e-mail when the current status has been updated, visit our subscription area.

FWC's Red Tide Action Report

Red tide is a naturally-occurring microscopic alga that has been documented along Florida’s Gulf Coast since the 1840’s and occurs nearly every year. Blooms, or higher-than-normal concentrations, of the Florida red tide alga, Karenia brevis, frequently occur in the Gulf of Mexico. Red tide begins in the Gulf of Mexico 10 to 40 miles offshore and can be transported inshore by winds and currents.

FWC Actions and Partnerships:

Red Tide Resources

Previous Regional Status Reports and Maps

February 09, 2018

Southwest coast report Adobe PDF (PDF 177KB) and map Adobe PDF (PDF 281KB)
East coast report Adobe PDF (PDF 56KB) and map Adobe PDF (PDF 290KB)
Northwest coast report Adobe PDF (PDF 56KB) and map Adobe PDF (PDF 405KB)
Google Earth mapExternal Website. 

February 02, 2018

Southwest coast report Adobe PDF (PDF 211KB) and map Adobe PDF (PDF 303KB)
East coast report Adobe PDF (PDF 51KB) and map Adobe PDF (PDF 411KB)
Northwest coast report Adobe PDF (PDF 50KB) and map Adobe PDF (PDF 404KB)
Google Earth mapExternal Website

January 26, 2018

Southwest coast report Adobe PDF (PDF 202KB) and map Adobe PDF (PDF 254KB)
East coast report Adobe PDF (PDF 41KB) and map Adobe PDF (PDF 290KB)
Northwest coast report Adobe PDF (PDF 44KB) and map Adobe PDF (PDF 347KB)
Google Earth mapExternal Website

January 18, 2018

Southwest coast report Adobe PDF (PDF 106KB) and map Adobe PDF (PDF 278KB)
East coast report Adobe PDF (PDF 65KB) and map Adobe PDF (PDF 291KB)
Northwest coast report Adobe PDF (PDF 64KB) and map Adobe PDF (PDF 335KB)
Google Earth mapExternal Website

Additional archived status maps can be found on FlickrExternal Website

Key for Results

DescriptionKarenia brevis cells/literPossible Effects (K. brevis only)
NOT PRESENT - BACKGROUND background levels of 1,000 cells or less None anticipated
VERY LOW >1,000 to 10,000 Possible respiratory irritation; shellfish harvesting closures > 5,000 cells/L
LOW >10,000 to 100,000 Respiratory irritation, possible fish kills and bloom chlorophyll probably detected by satellites at upper limits
MEDIUM >100,000 to 1,000,000 Respiratory irritation and probable fish kills
HIGH >1,000,000

As above plus discoloration


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