Karenia brevis is responsible for the red tide. It produces neurotoxins called brevetoxins, which are known to cause neurological problems in organisms and gastrointestinal problems. Brevetoxins cause neurotoxic shellfish poisoning. Symptoms in humans are vomiting, nausea, and neurological symptoms like slurred speech. This poisoning kills many fish. When red tide happens in the gulf coast the fishing industry takes a big hit causing a lot of people to lose money.
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