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Red Tide Current Status

Red Tide Status Report (July 20, 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 high concentrations in 12 samples collected from Sarasota County, low to high concentrations in 11 samples collected from or offshore of Charlotte County, background to high concentrations in 20 samples collected from or offshore of Lee County, and background to low concentrations in nine samples collected from or offshore of Collier County.

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

Over the past week, fish kills were reported in Southwest Florida in Sarasota County (Casperson Beach, Manasota Beach, Nokomis, Siesta Key Beach, Venice Beach, Venice North Jetty), Charlotte County (Lemon Bay, Little Gasparilla Island), Lee County (Boca Grande Beach, Bonita Beach, Bowman’s Beach, near Burnt Store Marina, Captiva Beach, Cayo Costa, Fort Myers Beach, Gasparilla Island, near Laika Lane, Sanibel Beach) and Collier County (Barefoot Beach, South Marco Beach).

Respiratory irritation was reported over the past week in Sarasota County (7/12, 7/16, 7/18-7/19 at Lido Key; 7/12, 7/17-7/18, and 7/20 at Manasota Beach; 7/16 and 7/19-7/20 at Nokomis; 7/16 and 7/18-7/20 at Venice Beach and Venice North Jetty), Lee County (7/19 at Cayo Costa, 7/20 at Gasparilla Island State Park), and Collier County (7/12-7/13 at South Marco Beach).

Forecasts by the USF-FWC Collaboration for Prediction of Red TidesExternal Website for Pinellas to northern Monroe counties predict net southeastern transport of surface and subsurface waters for most areas over the next three days.

Additional information regarding the current status of algal blooms in South Florida is being consolidated and posted on the Florida Department of Environmental Protection’s website: https://floridadep.gov/dear/algal-bloom.

View Statewide Red Tide Status Map Adobe PDF (PDF 397KB) (July 20, 2018)

Regional Status Reports and Maps (July 20, 2018)

Southwest coast report Adobe PDF (PDF 233KB) and map Adobe PDF (PDF 385KB)
East coast report Adobe PDF (PDF 54KB) and map Adobe PDF (PDF 400KB)
Northwest coast report Adobe PDF (PDF 38KB) and map Adobe PDF (PDF 464KB)

To see detailed information on this week's samples, view the current Statewide Google Earth map for July 20, 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

July 13, 2018
Southwest coast report Adobe PDF (PDF 123KB) and map Adobe PDF (PDF 292KB)
East coast report Adobe PDF (PDF 64KB) and map Adobe PDF (PDF 401KB)
Northwest coast report Adobe PDF (PDF 45KB) and map Adobe PDF (PDF 347KB)
Google Earth mapExternal Website

July 6, 2018
Southwest coast report Adobe PDF (PDF 141KB) and map Adobe PDF (PDF 403KB)
East coast report Adobe PDF (PDF 45KB) and map Adobe PDF (PDF 290KB)
Northwest coast report Adobe PDF (PDF 42KB) and map Adobe PDF (PDF 479KB)
Google Earth mapExternal Website

June 29, 2018
Southwest coast report Adobe PDF (PDF 254KB) and map Adobe PDF (PDF 274KB)
East coast report Adobe PDF (PDF 58KB) and map Adobe PDF (PDF 441KB)
Northwest coast report Adobe PDF (PDF 55KB) and map Adobe PDF (PDF 512KB)
Google Earth mapExternal Website

June 22, 2018
Southwest coast report Adobe PDF (PDF 128KB) and map Adobe PDF (PDF 390KB)
East coast report Adobe PDF (PDF 60KB) and map Adobe PDF (PDF 297KB)
Northwest coast report Adobe PDF (PDF 51KB) and map Adobe PDF (PDF 422KB)
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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