Health authorities in Eastern Samar have issued a precautionary red tide warning in parts of Eastern Samar and Samar ...

Harmful algae blooms are painting coastal shores in southwest Florida red and leaving swaths of dead fish — just weeks before thousands of people flock to the beach for spring break.

A red tide, or a harmful algae bloom, occurs "when microscopic algae multiply to higher-than-normal concentrations," the Florida Fish and Wildlife Conservation Commission notes.

Red tides, which are caused by blooms of algae species Karenia brevis, can release neurotoxins into the air and lead to eye and respiratory irritation.

Red tide algae Karenia brevis found in waters off of Manatee, Sarasota, Charlotte and Lee counties. Scientists explain what will influence the length and severity of a potential bloom.

What first seems like some type of unsettling waterborne disease is simply an algal bloom. Algal blooms occur when microalgal ...

Red tide is caused by high concentrations of a toxin-producing microscopic algae, called K. brevis, that is found in the Gulf of Mexico.

TACLOBAN CITY – Matarinao Bay in Eastern Samar has turned positive for red tide toxins based on the latest confirmation test ...

Red tides occur when algae grow out of control and produce harmful toxins that can kill fish and sicken people and pets.

Residents of Florida's Gulf Coast who weathered back-to-back hurricanes now have something else to keep an eye on: A possible plume of harmful algae in the waters off of the state's southwest coast.

Don't want red tide to crash your spring break plans? Check out where algae is currently reported, what to know about blooms in Florida ...

A University of South Florida study linked viruses and red tide, and researchers now wonder if they can wield them to keep red tide at bay.