What is red tide and how do you check it in Fort Myers?

What it does and does not do

At low concentrations you may notice nothing. At medium to high concentrations, wind blowing onshore aerosolises the toxin and most people develop a scratchy throat and dry cough within minutes of arriving at the beach; dead fish wash up and the smell becomes unpleasant.

Effects clear quickly once you leave the beach. People with asthma or COPD should treat any active bloom as a reason to stay away entirely. Do not swim in water with a visible bloom or dead fish, and do not eat recreationally harvested shellfish from affected waters.

How to check before you go

Red tide is patchy and changes daily. A bloom at Fort Myers Beach frequently means clear conditions at Bonita or Captiva 15 miles away — which is why per-beach reporting matters far more than a regional headline.

• FWC red tide status map — official water sample concentrations, updated regularly
• Mote Marine Beach Conditions Reporting System — lifeguard-reported respiratory irritation and dead fish, beach by beach, twice daily
• NOAA HAB forecast — 3-day outlook for bloom transport and respiratory risk
• Check the morning of your beach day, not the week before

When blooms are most likely

Red tide most commonly affects Southwest Florida from late summer through winter, with blooms often initiating offshore in the autumn. Some years pass with almost no impact; others see months of intermittent irritation. There is no reliable way to predict a season in advance, so build flexibility rather than avoiding the region.