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Red Tide Current Status

Red Tide Status Report (May 18, 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 concentrations in two samples collected from Manatee County, very low concentrations in two samples collected from Charlotte County, background to medium concentrations in eight samples collected from Lee County, and background to low concentrations in three samples collected from 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 Charlotte County (Shell Creek), Lee County (Bonita Beach) and Collier County (Barefoot Beach). Respiratory irritation was reported over the past week in Lee County on 5/17 at Newton Park. Forecasts by the USF-FWC Collaboration for Prediction of Red TidesExternal Website for Pinellas to northern Monroe counties predict northern movement of surface waters and minimal net movement of subsurface waters over the next three days.

View statewide map Adobe PDF (PDF 394KB) (May 18, 2018)

Regional Status Reports and Maps (May 18, 2018)

Southwest coast report Adobe PDF (PDF 124KB) and map Adobe PDF (PDF 394KB)
East coast report Adobe PDF (PDF 50KB) and map Adobe PDF (PDF 444KB)
Northwest coast report Adobe PDF (PDF 38KB) and map Adobe PDF (PDF 513KB)

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

May 11, 2018
Southwest coast report Adobe PDF (PDF 126KB) and map Adobe PDF (PDF 398KB)
East coast report Adobe PDF (PDF 46KB) and map Adobe PDF (PDF 416KB)
Northwest coast report Adobe PDF (PDF 43KB) and map Adobe PDF (PDF 481KB)
Google Earth mapExternal Website. 

May 4, 2018
Southwest coast report Adobe PDF (PDF 214KB) and map Adobe PDF (PDF 396KB)
East coast report Adobe PDF (PDF 49KB) and map Adobe PDF (PDF 291KB)
Northwest coast report Adobe PDF (PDF 43KB) and map Adobe PDF (PDF 482KB)
Google Earth mapExternal Website

April 27, 2018
Southwest coast report Adobe PDF (PDF 212KB) and map Adobe PDF (PDF 348KB)
East coast report Adobe PDF (PDF 55KB) and map Adobe PDF (PDF 294KB)
Northwest coast report Adobe PDF (PDF 52KB) and map Adobe PDF (PDF 431KB)
Google Earth mapExternal Website

April 20, 2018
Southwest coast report Adobe PDF (PDF 210KB) and map Adobe PDF (PDF 289KB)
East coast report Adobe PDF (PDF 50KB) and map Adobe PDF (PDF 419KB)
Northwest coast report Adobe PDF (PDF 48KB) and map Adobe PDF (PDF 482KB)
Google Earth map External Website

April 13, 2018
Southwest coast report Adobe PDF (PDF 219KB) and map Adobe PDF (PDF 275KB)
East coast report Adobe PDF (PDF 39KB) and map Adobe PDF (PDF 415KB)
Northwest coast report Adobe PDF (PDF 50KB) and map Adobe PDF (PDF 480KB)
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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