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A little longer answer
Runoff from sewage treatment plants and other sources flows into the ocean and can cause algae to grow faster, leading to red tides
Why Are Red Tides Dangerous?
Red tides produce powerful toxins, which are harmful chemicals that can kill fish, shellfish, mammals and birds.
If people eat fish or shellfish that have been in the water with toxic algae, they will also ingest the toxins, which can make them sick. Many regions restrict fishing during a red tide for this reason. Nearby restaurants take local fish and shellfish off the menu, too.
During a red tide, You often find beaches are sometimes covered in dead fish and other animals that either ingested toxins or couldn’t get enough oxygen.
I hope this answers you questions.
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