Red Tide is a harmful alga bloom caused by a naturally occurring alga (a plant-like microorganism) called Karenia brevis or K. brevis. When K. brevis appears in large quantities – typically in the ...

For any Floridian or 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 occurring, ...

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.

It is unclear if red tide will dissipate or continue to bloom in the coming weeks. A patchy red tide bloom has affected the Sarasota and Manatee county area over the past wee. Local experts confirmed ...