The sounds fish make can actually be an important tool for scientists attempting to track and manage fish populations. Underwater microphones can identify the presence of invasive species or reveal when and where fish are mating.
Rodney Rountree is an independent marine ecologist who has spent a lot of time in the past several years listening to fish.
His 25-year career has spanned many research and education institutions, most recently UMass Amherst and the university of Victoria. He's a member of the board of directors for The River Project, a nonprofit environmental group focused on the Hudson River.