1. Department of Biology and Ecology of Fishes Leibniz Institute of Freshwater Ecology and Inland Fisheries Berlin Germany
2. Department of Aquatic Resources Institute of Freshwater Research Swedish University of Agricultural Sciences Drottningholm Sweden
3. Institute of Biodiversity and Zoology University of Rostock Rostock Germany
4. Division of Integrative Fisheries Management Faculty of Life Sciences Humboldt‐Universität zu Berlin Berlin Germany