Scientists make dead coral reefs sound healthy with speakers. Fish respond in amazing way.

Fish are flocking to the areas, helping previously dormant coral reefs rebound

December 1, 2019
Coral Reef

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During a 6-week field experiment, experts put underwater loudspeakers in Australia’s Great Barrier Reef in areas with dead coral and played audio taken from healthy reefs. They wanted to see whether they could lure back the diverse communities of fish essential to counteracting reef degradation.

The study, published in the journal Nature Communications, the number of species present in the reef patches where healthy sounds were played increased by 50 percent over the other patches. The new fish populations included species such as scavengers, herbivores and predatory fish. Importantly, the fish that arrived at the patches tended to stay there.

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