Whether you're a native Floridian or a seasoned visitor to the state's coasts, you know it only takes a visit from one unwanted visitor to ruin any beach day — red tide. Karenia brevis is a naturally ...

Fish kills can start when levels reach 10,000 cells per liter. In 20 Florida locations, concentrations were higher than 100,000. Health alerts for red tide have been issued in Lee, Collier counties.

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. Red ...

The toxic blooms may get "considerably worse," according to experts. A toxic algae bloom is creeping up the west coast of the Sunshine State, killing wildlife and keeping residents and tourists away ...

As red tide counts fall in Southwest Florida, Florida Fish and Wildlife suspects the toxic algae killed a manatee and a dolphin earlier this month. The 9-foot male manatee carcass was collected Feb. 7 ...

Red tide has waters off Southwest Florida in the "kill zone." Caused by the Karenia brevis organism, red tide is no stranger to Florida waters. They've been documented in the Gulf of Mexico — soon to ...