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Red Tide Current Status

Red Tide Status (November 17, 2017)

A bloom of the Florida red tide organism, Karenia brevis, was observed along Lee County in Southwest Florida.

In Southwest Florida over the past week, K. brevis was observed at background concentrations in one sample collected from Manatee County, background to very low concentrations in five samples collected from Sarasota County, background to low concentrations in eight samples collected from Charlotte County, and background to high concentrations in eleven samples collected from Lee County.

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

Forecasts for Southwest Florida by the USF-FWC Collaboration for Prediction of Red TidesExternal Website predict southern, offshore movement of surface waters and southern, onshore movement of subsurface waters from Pinellas to Lee counties over the next three days.


Red Tide Status Map (November 17, 2017)

View statewide map Adobe PDF (PDF 355KB) (November 17, 2017)

Regional Status Reports and Maps (November 17, 2017)

Southwest coast report Adobe PDF (PDF 130KB) and map Adobe PDF (PDF 334KB)
East coast report Adobe PDF (PDF 43KB) and map Adobe PDF (PDF 297KB)
Northwest coast report Adobe PDF (PDF 44KB) and map Adobe PDF (PDF 316KB)

To see detailed information on this week's samples, view the current Statewide Google Earth map for November 17, 2017External 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 website.External 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

November 9, 2017

Southwest coast report Adobe PDF (PDF 136KB) and map Adobe PDF (PDF 335KB)
East coast report Adobe PDF (PDF 53KB) and map Adobe PDF (PDF 239KB)
Northwest coast report Adobe PDF (PDF 55KB) and map Adobe PDF (PDF 414KB)
Google Earth mapExternal Website

November 3, 2017

Southwest coast report Adobe PDF (PDF 132KB) and map Adobe PDF (PDF 252KB)
East coast report Adobe PDF (PDF 50KB) and map Adobe PDF (PDF 150KB)
Northwest coast report Adobe PDF (PDF 60KB) and map Adobe PDF (PDF 217KB)
Google Earth mapExternal Website

October 27, 2017

Southwest coast report Adobe PDF (PDF 103KB) and map Adobe PDF (PDF 283KB)
East coast report Adobe PDF (PDF 62KB) and map Adobe PDF (PDF 301KB)
Northwest coast report Adobe PDF (PDF 45KB) and map Adobe PDF (PDF 331KB)
Google Earth mapExternal Website

October 20, 2017

Southwest coast report Adobe PDF (PDF 120KB) and map Adobe PDF (PDF 313KB)
East coast report Adobe PDF (PDF 62KB) and map Adobe PDF (PDF 300KB)
Northwest coast report Adobe PDF (PDF 68KB) and map Adobe PDF (PDF 289KB)
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


Hotlines and Information Sources

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