Zerbst, Saxony-Anhalt, Germany. 18th Dec 2019. Steffen Zahn from the Institute for Inland Fisheries in Potsdam is missing a sea trout. It had been caught during a trial fishery to prove that sea trout and salmon were returning to the Nuthe River near Zerbst. Credit: Mattis Kaminer/Alamy Live News

- Image ID: 2AGADWM

Zerbst, Saxony-Anhalt, Germany. 18th Dec 2019. Steffen Zahn from the Institute for Inland Fisheries in Potsdam is missing a sea trout. It had been caught during a trial fishery to prove that sea trout and salmon were returning to the Nuthe River near Zerbst. Credit: Mattis Kaminer/Alamy Live News

Mattis Kaminer / Alamy Stock Photo

Image ID: 2AGADWM