Zerbst, Saxony-Anhalt, Germany. 18th Dec 2019. Steffen Zahn from the Institute for Inland Fisheries in Potsdam (Institur für Binnenfischerei) drips an anaesthetic into a plastic tub. Salmon and sea trout are briefly anaesthetised in the liquid to measure, weigh and mark them. Zahn heads the migratory fish programme in Saxony-Anhalt. A total of 143,500 young salmon and 90,300 sea trout hatchlings have been released into the Nuthe near Zerbst over the past ten years. Credit: Mattis Kaminer/Alamy Live News

- Image ID: 2AGADMJ

Zerbst, Saxony-Anhalt, Germany. 18th Dec 2019. Steffen Zahn from the Institute for Inland Fisheries in Potsdam (Institur für Binnenfischerei) drips an anaesthetic into a plastic tub. Salmon and sea trout are briefly anaesthetised in the liquid to measure, weigh and mark them. Zahn heads the migratory fish programme in Saxony-Anhalt. A total of 143,500 young salmon and 90,300 sea trout hatchlings have been released into the Nuthe near Zerbst over the past ten years. Credit: Mattis Kaminer/Alamy Live News

Mattis Kaminer / Alamy Stock Photo

Image ID: 2AGADMJ