ALT Leaping salmon in Alaska. Credit: Adobe Stock.

ALT Migrating salmon in California. Credit: U.S. Fish and Wildlife Service.

ALT Migrating river herring in the Northeast. Credit: U.S. Fish and Wildlife Service.

ALT A close-up view of an American eel partially emerging from its rocky underwater hideout in a clear water environment on the St. Lawrence River. Credit: ©Robert la Salle for Adobe Stock

ALT Underwater view of a group of sockeye salmon with prominent green heads and red backs, swimming over a riverbed of rounded stones. Credit: NOAA Fisheries

ALT Alewife during their spring spawning migration in the Bagaduce River, Maine. The view is underwater and the silvery large-eyed fish form a dense school swimming dynamically, with numerous bubbles surrounding them. Credit: Tate Yoder/Maine Center for Coastal Fisheries