How does red tide impact beachgoers?

Many people are flocking to the Gulf Coast for spring break. However, toxic red tide algal blooms have put beachgoers and residents on alert.

Unwanted visitor ruins spring break in Florida—toxic algae

With its brilliant sun, white sand and turquoise water, Lido Key Beach would make for a perfect postcard of Florida beaches if it weren't for the dozens of dead fish lying on the shore, killed by a toxic algae bloom known ...

Ian ruins man-made reefs, brings algae bloom to Florida

Hurricane Ian not only ravaged southwest Florida on land but was destructive underwater as well. It destroyed man-made reefs and brought along red tide, the harmful algae blooms that kill fish and birds, according to marine ...

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Red tide

Red tide is a common name for a phenomenon more correctly known as an algal bloom, an event in which estuarine, marine, or fresh water algae accumulate rapidly in the water column. These algae, more specifically phytoplankton, are single-celled protists, plant-like organisms that can form dense, visible patches near the water's surface. Certain species of phytoplankton, such as Dinoflagelate, contain photosynthetic pigments that vary in colour from green to brown to red.

When the algae are present in high concentrations, the water appears to be discoloured or murky, varying in colour from purple to almost pink, normally being red or green. Not all algal blooms are dense enough to cause water discolouration, and not all discoloured waters associated with algal blooms are red. Additionally, red tides are not typically associated with tidal movement of water, hence the preference among scientists to use the term algal bloom.

Some red tides are associated with the production of natural toxins, depletion of dissolved oxygen or other harmful effects, and are generally described as harmful algal blooms. The most conspicuous effects of red tides are the associated wildlife mortalities among marine and coastal species of fish, birds, marine mammals and other organisms. In the case of Florida red tides, these mortalities are caused by exposure to a potent neurotoxin called brevetoxin which is produced naturally by the marine algae Karenia brevis.

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