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Florida red tides are blooms (high concentrations) of a microscopic algae called Karenia brevis. These blooms can turn the water red, green or brown, but you might not always be able to see a red tide.

Florida red tides produce a toxic substance (called brevetoxin) that can kill fish. Brevetoxin affects the nervous systems of fish and other animals that live in Sarasota Bay, including birds, mammals and other sea life. Animals suffering the effects of brevetoxin may swim in circles, become paralyzed, have seizures or die. The toxin can enter the bodies of mollusks, including clams and oysters, making them poisonous to eat. People who consume these contaminated shellfish can suffer food poisoning called NSP (neurotoxic shellfish poisoning).

Red tide toxins can also be carried over land by wind, and they can cause temporary problems in people, including coughing, sneezing and watery eyes. People with chronic respiratory problems should be especially careful to avoid areas with Florida red tide toxin in the air. Swimming in waters with Florida red tide may cause skin irritations and burning eyes. For more information, please visit www.mote.org and click "Environmental Updates" followed by "Red Tide".

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