Skip to main content

Red Tide Current Status

Daily Sample Map
This map contains the last eight days of sampling and is updated daily at 5 p.m.
Please be sure to click on individual dots for sampling details.

Red Tide Mid-Week Update for November 20, 2019

Current Conditions

A bloom of the red tide organism, Karenia brevis, persists in Southwest Florida. Additional details are provided below.

  • In Southwest Florida over the past week, K. brevis was observed at background to very low concentrations in Pinellas County, background concentrations in Manatee County, background to high concentrations in Sarasota County, medium to high concentrations in Charlotte County, background to high concentrations in and/or offshore of Lee County, and very low to high concentrations in Collier County. Bloom concentrations (>100,000 K. brevis  cells per liter) persist in Sarasota, Charlotte, Lee, and Collier counties. These included coastal sites in Sarasota County, coastal, inlet, and estuarine sites in Charlotte, Lee, and Collier Counties, as well as a sample collected 18 miles offshore of Lee County. High concentrations (>1 million cells per liter) were observed in 47 samples from these counties.
  • In Northwest Florida over the past week, K. brevis was observed at background concentrations in one sample each from Escambia and Bay counties.
  • Along the Florida East Coast over the past week, K. brevis was not observed. 

Fish Kills

In Southwest Florida over the past week, fish kill reports were received for Sarasota, Charlotte, Lee, and Collier counties (please see

Respiratory Irritation

Respiratory irritation was reported over the past week in Southwest Florida in Sarasota, Lee, and Collier counties. 


Forecasts by the USF-FWC Collaboration for Prediction of Red Tides for Sarasota to northern Monroe counties predict net southwestern movement of surface waters and net southeastern transport of subsurface waters in most areas over the next four days.

Red Tide Status Map (November 20, 2019)

Southwest Coast Red Tide Counts November 12 through 19, 2019

View a larger map (November 20, 2019).

The next status report will be issued on Friday, November 22nd. Please check our daily sampling map which can be accessed from the top of this page.

Archived status maps can be found in our Flickr galleryPrevious regional status reports and maps can be found on our red tide resources page.

Latest Red Tide Status Report Available by Phone

Call 866-300-9399 at any time from anywhere in Florida to hear a recording about red tide conditions throughout the state. Callers outside of Florida can dial 727-552-2448. Standard calling charges apply.

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.

Additional Information

For additional information about red tide and the current red tide bloom, including information on how to report a fish kill or other wildlife effects, consult health authorities about human exposure, or locate other resources, visit our Red Tide-Related Hotlines and Information Sources article.

Blue-Green Algae Bloom Information

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:

Key for Results

Description K. brevis abundance Possible effects (K. brevis only)
NOT PRESENT- BACKGROUND background levels of 1,000 cells or less no effects anticipated
VERY LOW > 1,000 - 10,000 cells/L possible respiratory irritation; shellfish harvesting closures when cell abundance equals or exceeds 5,000 cells/L
LOW > 10,000 - 100,000 cells/L respiratory irritation; shellfish harvesting closures; possible fish kills; probable detection of chlorophyll by satellites at upper range of cell abundance
MEDIUM > 100,000 - 1,000,000 cells/L respiratory irritation; shellfish harvesting closures; probable fish kills; detection of surface chlorophyll by satellites
HIGH > 1,000,000 cells/L as above, plus water discoloration