About Red Tide

Florida red tide is a higher-than-normal concentration of a naturally occurring, microscopic algae called Karenia brevis, often abbreviated as K. brevis. It produces brevetoxins — powerful and potent neurotoxins — that can kill marine animals and be harmful to humans.

Red tides form many miles offshore, sometimes causing no impact to humans. However, when red tides travel inshore on wind and water currents, they can cause respiratory irritation among beachgoers, especially those who have underlying lung diseases. The Florida Department of Health advises that people with underlying chronic respiratory problems like asthma or COPD should avoid red tide areas, especially when winds are blowing toxins on or near shore. - Mote Marine

One of the most frequent symptoms people experience during a K. brevis red tide is respiratory irritation. If you have ever visited a beach during a red tide, you may have experienced the "red tide tickle" which can include itchy throat and coughing. 

Even if you’re not prone to respiratory issues you should be careful: these toxins can cause breathing problems, and can irritate your eyes, nose and throat. Reactions to red tide are worse for people with asthma, emphysema, bronchitis or any chronic lung disease. If you have health issues, stay away from areas with red tide. Pets can become sick from red tide so keep them away from those areas, and contaminated marine animals and fish.

Don’t swim in or around red tide because the toxin can cause skin irritation, rashes and burning and sore eyes. If you come into contact with red tide, wash off with soap and water. You can get relief from respiratory symptoms by being in an air-conditioned space. For people without asthma or chronic respiratory problems, over-the-counter antihistamines can help. If your symptoms don’t get better, see a doctor. - Department of Health

Red Tide FAQ

About Red Tide in Florida

What causes red tide?
Are the dead fish causing me respiratory irritation?
Will removing dead fish near my home eliminate the smell?
Is red tide a new phenomenon?
Are Florida red tides always red?
How long can red tide last?
Can we predict when and where a Florida red tide will occur?
Has coastal (nutrient) pollution caused the Florida red tide?

Health and Safety Concerns

Will I experience respiratory irritation during a red tide in Florida
Can I swim in the ocean when there’s a red tide bloom?
Could Florida red tide affect my pets?
Is it OK to eat shellfish at a restaurant or purchase shellfish from a seafood market during a red tide? (also known as commercially caught or store bought)
Is it OK to eat recreationally harvested shellfish during a red tide?
Is it OK to eat local finfish during a red tide?
Does cooking or freezing destroy the Florida red tide toxin?
Where can I get more health and safety information on harmful algae?