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Red Tide Current Status

Red Tide Status (March 17, 2017)

A patchy bloom of the Florida red tide organism, Karenia brevis, persists in Southwest Florida from southern Pinellas to Lee counties.

Over the past week, Karenia brevis was observed at very low to low concentrations in two samples collected from Pinellas County; background to very low concentrations in three samples collected from Manatee County; background to medium concentrations in thirteen samples collected from Sarasota County; background to medium concentrations in four samples collected from Charlotte County; and background to low concentrations in eight samples collected from Lee County. 

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

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

For the week of March 20th, a single report will be issued on Thursday, March 23, 2017. We will return to biweekly reporting (Wednesday and Friday) the following week.

View a statewide map Adobe PDF (PDF 220 KB) (March 17, 2017)

Regional Status Reports and Maps (March 17, 2017)

Southwest coast report Adobe PDF(PDF 124KB) and map Adobe PDF(PDF 176KB)
East coast report Adobe PDF (PDF 52KB) and map Adobe PDF (PDF 228KB)
Northwest coast report Adobe PDF(PDF 56KB) and map Adobe PDF (PDF 244KB)

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

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

March 10, 2017
Southwest coast report Adobe PDF(PDF 148KB) and map Adobe PDF(PDF 160KB)
East coast report Adobe PDF (PDF 48KB) and map Adobe PDF (PDF 228KB)
Northwest coast report Adobe PDF(PDF 40KB) and map Adobe PDF (PDF 240KB)
Google Earth map

March 3, 2017
Southwest coast report Adobe PDF(PDF 208KB) and map Adobe PDF(PDF 168KB)
East coast report Adobe PDF (PDF 44KB) and map Adobe PDF (PDF 228KB)
Northwest coast report Adobe PDF(PDF 44KB) and map Adobe PDF (PDF 240KB)
Google earth map

February 24, 2017
Southwest coast report Adobe PDF (PDF 120KB) and map Adobe PDF (PDF 220KB)
East coast report Adobe PDF (PDF 40KB) and map Adobe PDF (PDF 264KB)
Northwest coast report Adobe PDF (PDF 48KB) and map Adobe PDF (PDF 244KB)
Google Earth map

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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