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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 April 21, 2021

Current Conditions

The red tide organism, Karenia brevis, persists in Southwest Florida. Over the past week, K. brevis was detected in 70 samples. Bloom concentrations (>100,000 cells/liter) were observed in two samples from Sarasota County, 10 samples from Charlotte County, and three samples from Lee County. Additional details are provided below.

  • In Southwest Florida over the past week, K. brevis was observed at background concentrations in Hillsborough County (in one sample), background to medium concentrations in Sarasota County (in 29 samples), background to high concentrations in Charlotte County (in 18 samples), background to medium concentrations in and offshore of Lee County (in 14 samples) and background to low concentrations in and offshore of Collier County (in 8 samples). Samples from or offshore of Pinellas, Manatee, and Monroe counties did not contain red tide.
  • In Northwest Florida over the past week, K. brevis  was not observed.
  • Along the Florida East Coast over the past week, K. brevis was not observed.

Fish Kills

In Southwest Florida over the past week, fish kills suspected to be related to red tide were reported in Sarasota and Charlotte counties. For more details, please visit: https://myfwc.com/research/saltwater/health/fish-kills-hotline/.

Respiratory Irritation

Respiratory irritation was reported over the past week in Southwest Florida in Manatee and Sarasota counties. For current information, please visit: https://visitbeaches.org.

Forecast

Forecasts by the USF-FWC Collaboration for Prediction of Red Tides for Pinellas to northern Monroe counties predict variable surface currents with net western transport and minimal net movement of subsurface waters in most areas over the next four days.

Piney Point Updates

FWC-FWRI is working closely with the Florida Department of Environmental Protection (FDEP) and other partners on the Piney Point discharge response. Status updates are posted on the Protecting Florida Together website: https://protectingfloridatogether.gov/PineyPointUpdate.

Red Tide Status Map (April 21, 2021)

Southwest Coast Red Tide Counts April 13 through 20, 2021

View a larger map (April 21, 2021).

The next complete status report will be issued on Friday, April 23rd. 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 gallery. Previous 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 727-502-4952. 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: https://floridadep.gov/dear/algal-bloom.

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