Onshore, or on a boat, have you ever wondered what swims below in the dark water? Using standard equipment and a new process, marine scientists can now get a good look at what is swimming by—just by analyzing the water.

Taking stock of fish living or passing through a river, estuary, or other body of water is never easy. For years, fish stocks and migration patterns were understood only by trawling for fish with nets, a process that literally only captures a small portion of the action down below.

Without harming fish or using specialized equipment, researchers from the Rockefeller… more

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