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LETTER TO THE EDITOR: Water samples show red tide in our waters

February 9, 2023
By Boca Beacon Reader

 To the Editor:

The Florida Department of Health in Lee County has issued health alerts for the presence of a red tide bloom. An alert level of red tide was found near Buck Key (Blind Pass), Gasparilla Island State Park (Boca Grande Pass), Tarpon Bay Road Beach (Sanibel), and Lighthouse Beach (Sanibel). This is in response to water samples taken on January 31, 2023 and February 1, 2023.

Residents and visitors are advised to take the following precautions:

• Look for informational signage posted at most beaches.

• Stay away from the water, and do not swim in waters with dead fish.

• Those with chronic respiratory problems should be especially cautious and stay away from this location as red tide can affect your breathing.

• Do not harvest or eat molluscan shellfish or distressed or dead fish from this location. If caught live and healthy, finfish are safe to eat as long as they are filleted and the guts are discarded. Rinse fillets with tap or bottled water.

• Wash your skin and clothing with soap and fresh water if you have had recent contact with red tide.

• Keep pets and livestock away and out of the water, sea foam and dead sea life. If your pet swims in waters with red tide, wash it as soon as possible.

• Residents living in beach areas are advised to close windows and run the air conditioner, making sure that the A/C filter is maintained according to manufacturer’s specifications.

If outdoors near an affected location, residents may choose to wear masks, especially if onshore winds are blowing.

In Florida, red tide is caused by a naturally occurring microscopic alga called Karenia brevis. Red tide algal blooms can change rapidly, staying in one place for months or just a few days or weeks.

Symptoms from breathing red tide usually include coughing, sneezing and watery eyes. For most people, symptoms are temporary and typically go away when the person leaves the area. Wearing a particle filter mask may lessen the effects, and over-the-counter antihistamines decrease symptoms.

Red tide typically forms naturally offshore, commonly in late summer or early fall, and is carried into coastal waters by winds and currents. Once inshore, these opportunistic organisms can use nearshore nutrient sources to fuel their growth. Blooms typically last into winter or spring, but in some cases, can endure for more than one year.

Brevis produces potent neurotoxins (brevetoxins) that can be harmful to the health of both wildlife and people. Wind and wave action can break open K. brevis cells and release toxins into the air. This is why you should monitor conditions and use caution when visiting affected water bodies. People in coastal areas can experience varying degrees of eye, nose and throat irritation during a red tide bloom. Some individuals with chronic respiratory conditions like asthma or chronic lung disease might experience more severe symptoms. Red tide toxins can also affect the central nervous system of fish and other marine life, which can lead to fish kills and increased wildlife strandings or mortalities. Eating contaminated seafood can cause neurotoxic shellfish poisoning in humans. Symptoms include nausea and vomiting; tingling of the mouth, lips and tongue; and slurred speech and dizziness.

Find current information about Florida’s water quality status and public health notifications for harmful algal blooms and beach conditions by visiting and 

 If you have questions about red tide blooms, call DOH-Lee at (239) 690-2100.

Tammy Soliz, Public Information Officer