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Red Tide Current Status

Red Tide Status Report (January 18, 2018)

A bloom of the Florida red tide organism, Karenia brevis, was observed in Charlotte, Lee, and Monroe counties in Southwest Florida.

In Southwest Florida over the past week, K. brevis was observed at background to medium concentrations in six samples collected from Charlotte County, very low to low concentrations in four samples collected from Lee County, and low concentrations in four samples collected from Monroe County.

In Northwest Florida over the past week, K. brevis was observed at background concentrations in two samples collected from Gulf County.

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

A fish kill in Lee County and slight respiratory irritation in Sarasota County were reported over the past week. Forecasts for Southwest Florida by the USF-FWC Collaboration for Prediction of Red TidesExternal Website predict net southern, offshore transport of surface waters and southern, onshore transport of subsurface waters from Pinellas to Lee counties over the next three days.

Red Tide Status Map (January 18, 2018)

View Statewide map Adobe PDF (PDF 280KB) (January 18, 2018)

Regional Status Reports and Maps (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)

To see detailed information on this week's samples, view the current Statewide Google Earth map for January 18, 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 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

January 12, 2018

Southwest coast report Adobe PDF (PDF 123KB) and map Adobe PDF (PDF 205KB)
East coast report Adobe PDF (PDF 59KB) and map Adobe PDF (PDF 297KB)
Northwest coast report Adobe PDF (PDF 46KB) and map Adobe PDF (PDF 347KB)
Google Earth map External Website

January 5, 2018

Southwest coast report Adobe PDF (PDF 83KB) and map Adobe PDF (PDF 324KB)
East coast report Adobe PDF (PDF 43KB) and map Adobe PDF (PDF 247KB)
Northwest coast report Adobe PDF (PDF 40KB) and map Adobe PDF (PDF 302KB)
Google Earth mapExternal Website

December 28, 2017

Southwest coast report Adobe PDF (PDF 84KB) and map Adobe PDF (PDF 309KB)
East coast report Adobe PDF (PDF 44KB) and map Adobe PDF (PDF 310KB)
Northwest coast report Adobe PDF (PDF 40KB) and map Adobe PDF (PDF 365KB)
Google Earth mapExternal Website

December 22, 2017

Southwest coast report Adobe PDF (PDF 120KB) and map Adobe PDF (PDF 341KB)
East coast report Adobe PDF (PDF 51KB) and map Adobe PDF (PDF 283KB)
Northwest coast report Adobe PDF (PDF 43KB) and map Adobe PDF (PDF 375KB)
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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