Fish and Wildlife Research Institute

What is a Harmful Algal Bloom?

A harmful algal bloom (HAB) is the proliferation of a toxic or nuisance algae.

Red Tides in Florida

Florida red tides occur almost every year in the Gulf of Mexico. The Florida red tide organism, Karenia brevis, produces a toxin that can kill marine animals and affect humans. Scientists have studied this organism for more than 50 years.

Taxonomic History of Florida's Red Tide Organism

Taxonomists revise species descriptions and classifications as scientific techniques improve. Karenia brevis, the new name for Florida's red tide organism, has undergone several taxonomic reclassifications.

Cyanobacteria in Florida Surface Water Reservoirs

Cyanobacteria (or blue-green algae) are commonly found in Florida's lakes, rivers, and estuaries. Some species can produce toxins that affect public health and the environment.

Microcystis in the Environment and Its Health Effects

Microcystis is found naturally at low concentrations in freshwater systems and sometimes in low salinity areas. It occasionally forms a harmful algal bloom (HAB). Microcystis produces a toxin that can affect human and animal health.

Marine Poisons: Life and Death

Natural marine biotoxins can be harmful to humans and can cause numerous illnesses or even death. However, toxins and other natural compounds from marine animals can also be helpful and used to treat a variety of ailments.

The Sea Aglow

Bioluminescence is the chemical production of light by plants and animals. Most, but not all, luminescent organisms are found in the sea. Learn more about bioluminescence here!

Red Tide FAQ

Do you have questions about Florida's red tide? Find the answers here.