New underwater acoustic camera identifies individual fish sounds, helping track threatened species

Fish were discovered to make sounds more than 2,000 years ago, but they have gone largely unheard by humans. While a typical, bustling coral reef may be home to dozens of fish species, until recently, identifying specific species’ sounds was practically impossible. Previous methods of studying fish sounds often involved divers interfering in the fishes’ habitats, or researchers recording fish in captivity, which frequently meant forcing them to make sounds under stress by handling them or giving them electric shocks. Now, scientists have used a new combination of underwater audio and visual recording to identify the sounds of 46 fish species in their natural environment, the largest collection of wild fish sounds ever recorded. The new device, described recently in the journal Methods in E