Stock Photo - 12 December 2023, Saxony-Anhalt, Zerbst: Steffen Zahn (r) from the Institute of Inland Fisheries Potsdam-Sacrow and a colleague release a previously caught sea trout into the Nuthe. As part of the ""Saxony-Anhalt Migratory Fish Program"", the men are electrically fishing the Nuthe below Zerbst to detect returning species such as salmon and sea trout. Caught fish are to be registered, measured and weighed and then released close to where they were caught. The institute releases up to 20,000 fry at the site every year. Photo: Klaus-Dietmar Gabbert/dpa/ZB. - Zerbst/Saxony-Anhalt/Germany

Stock Photo: 12 December 2023, Saxony-Anhalt, Zerbst: Steffen Zahn (r) from the Institute of Inland Fisheries Potsdam-Sacrow and a colleague release a previously caught sea.

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