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Danielle Dixson

Healthy corals use chemical signals, or smells, to attract fish. New research has found that corals also send out "distress" signals when they're in trouble.

Coral reefs can communicate with fish, and many of them are crying for help

Environment

With corals in trouble around the world, researchers are examining the role of smell in telling fish to come to a healthy reef or stay away. That may help scientists find ways to manipulate the smells to help damaged reefs recover.

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