Speakers used to make dead coral reefs sound healthy

This photo released on Monday, December 2, 2019 shows an underwater loudspeaker on a coral reef attracting young fish. Scientists from Britain and Australia are using underwater loudspeakers to entice fish back to dead coral reefs with the aim of helping the reefs to recover. Scientists tested this "acoustic enrichment" strategy by placing speakers on patches of dead coral in the Great Barrier Reef. They discovered that twice as many fish arrived and stayed in those parts of the reef, compared to similar patches where no sound was played. [Photo: SWNS via VCG]