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Images: Listening for Telltale Echoes from Fish

Scientists adaped a low-frequency sonar system, originally designed to survey seafloor geology, to identify fish and zooplankton. (Photo by Mike Jech, National Fisheries Science Center)

The research team towed a low-frequency broadband imaging sonar near fish schools. For comparison, they also collected sound data from a conventional high-frequency hull-mounted sonar system. Trawls collected fish samples to groundtruth sonar data. (Illustration by Jayne Doucette, Woods Hole Oceanographic Institution)

To test whether they could use low-frequency sonar to identify fish, the scientists targeted schools of Atlantic herring in deep water over Georges Bank. (Photo courtesy of Tim Stanton, Woods Hole Oceanographic Institution)

The research team aboard the NOAA ship FR/V Delaware II dockside in Woods Hole: From left, Tim Stanton (WHOI), Dezhang Chu (WHOI), Ben Reeder (former MIT/WHOI JP student, now at the Naval Postgraduate School), and Mike Jech (NOAA/NMFS). (Courtesy of Tim Stanton, Woods Hole Oceanographic Institution)