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's officially spring break season in Florida! However, 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 ...

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 ...

The Florida Department of Health in Lee County still has advisories posted for several area beaches as red tide counts continue to hover well above the toxic range. DOH says coastal residents should ...

Red tide is a toxic algae bloom that can be deadly to marine life and harmful to humans. Blooms typically occur in the fall but can happen at any time and last from a few days to several years. The ...

Every fall, coastal residents of Florida wait and wonder: Will the water stay clear, or will the red tide return? This harmful algal bloom, caused by the algae Karenia brevis, does not devastate our ...

Red tide is caused by a naturally occurring organism called Karenia brevis, which can discolor water and release toxins. While red tide is more common in warmer months, it can occur year-round and ...