More Red Tide for SW Florida

Home States More Red Tide for SW Florida

The red tide organism, Karenia brevis, persists in Southwest Florida, where it was detected in 56 samples over the past week. Bloom concentrations (>100,000 cells/liter) were observed in one sample from Sarasota County, nine samples from Charlotte County, and one sample from Collier County. K. brevis was also observed at background concentrations in one sample from the Florida East Coast. Additional details are provided below.

  • In Southwest Florida over the past week, K. brevis was observed at background to low concentrations in Manatee County, background to medium concentrations in Sarasota County, low to high concentrations in Charlotte County, background to low concentrations in or offshore of Lee County, background to medium concentrations in or offshore of Collier County, and very low to low concentrations offshore of Monroe County.
  • In Northwest Florida over the past week, K. breviswas not observed.
  • Along the Florida East Coast over the past week, K. brevis was observed at background concentrations in one sample in Volusia County.

Fish kills suspected to be related to red tide were reported over the past week in Sarasota and Charlotte counties. For more details, please visit:

Respiratory irritation was reported over the past week in Southwest Florida in Manatee, Sarasota, and Charlotte counties. Additional details are provided in the Southwest Coast report and for current information, please visit:

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

FWC-FWRI is working closely with the Florida Department of Environmental Protection (FDEP) and other partners on the Piney Point response effort. Status updates and results are posted on the Protecting Florida Together website  ( and on the Tampa Bay Estuary Program website (

The next complete status report will be issued on Friday, May 7th. 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.

The FWRI HAB group in conjunction with Mote Marine Laboratory now have a facebook page.  Please like our page and learn interesting facts concerning red tide and other harmful algal blooms in Florida.