Red tide is caused by a harmful algae bloom. It can bring respiratory problems and even fish kills in high concentrations.

While red tides and other algal blooms can occur worldwide, Karenia brevis is found almost exclusively in the Gulf of Mexico ...

The latest counts from the Florida Fish and Wildlife Conservation Commission, or FWC, show background to moderate levels along the Lee and Collier coastlines.

Red tide is caused by an microscopic algae called karenia brevis. Health alerts for red tide have been issued for several areas in Southwest Florida. Red tides can last for days, weeks or months.