Red Tide Status Update: 3/5/25

Over the past week, red tide was detected in 44 samples collected from Southwest Florida. Bloom concentrations (>100,000 cells/liter) were not observed. We continue to use satellite imagery (USF and NOAA NCCOS) to help track nearshore and offshore conditions. Elevated chlorophyll features along the coast of Southwest Florida appear to have dissipated in most areas.

Additional details are provided below.

• In Southwest Florida over the past week, K. brevis was observed at background to very low concentrations in and offshore of Pinellas County, background to low concentrations in and offshore of Hillsborough County, background to very low concentrations offshore of both Manatee and Sarasota counties, background to very low concentrations in and offshore of Charlotte County, and background concentrations offshore of both Lee and Monroe counties.
• 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 suspected to be related to red tide were reported to FWC’s Fish Kill Hotline and other partners over the past week for Southwest Florida (Pinellas, Manatee, and Sarasota counties). 

Respiratory irritation suspected to be related to red tide was reported over the past week in Southwest Florida (Pinellas, Manatee, and Sarasota counties). For forecasts that use FWC and partner data, please visit the National Oceanic and Atmospheric Administration’s Gulf of Mexico Harmful Algal Blooms Forecast.

Forecasts by the USF-FWC Collaboration for Prediction of Red Tides for Pinellas County to northern Monroe County predict variable movement of surface and subsurface waters over the next 3.5 days.

The next status report will be issued on Friday, March 7. Please check our daily sampling map, which can be accessed via the online status report on our Red Tide Current Status page. For more information on algal blooms and water quality, please visit Protecting Florida Together.

This information, including maps and reports with additional details, is also available on the FWRI Red Tide website. The website also provides links to additional information related to the topic of Florida red tide including satellite imagery, experimental red tide forecasts, shellfish harvesting areas, the FWC Fish Kill Hotline, the Florida Poison Information Center (to report human health effects related to exposure to red tide), and other wildlife related hotlines.

To learn more about various organisms that have been known to cause algal blooms in Florida waters, see the FWRI Red Tide Flickr page. Archived status maps can also be found on Flickr.       

Please follow our facebook page for status updates and other interesting facts about red tide and other harmful algal blooms in Florida.