A team of scientists says that playing sounds underwater can get fish to return to areas with severely damaged coral reefs. In an experiment, they found fish returned after hearing recordings of the sounds of a healthy ocean reef. The international team included scientists from the British universities of Exeter and Bristol, as well as Australia’s James Cook University. The research results were reported in the publication Nature Communications. The scientists placed underwater speakers in areas where coral had been dying in Australia’s northern Great Barrier Reef. They played the sounds over a period of about six weeks in 2017, and studied the results. The team reported that twice as many fish arrived in areas where the sounds of healthy coral were played.