Red tides, which are massive algal blooms, can block sunlight from reaching the sea floor and release toxins into the water and air.
12 dolphins dead in 'devastating' loss, as red tide disaster wipes
Red Tide Invades Florida — But What Is It?
Red tide seagrass loss threatens Florida marine life
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Red tide continues from Captiva south to Marco - Naples Florida Weekly
Seagrass is dying by Tampa and Sarasota as red tide worsens
As Florida's toxic red tide stretches on, residents report health
Red Tide Is Devastating Florida's Sea Life. Are Humans to Blame?