1. Department of Biology and Ecology of Fishes Leibniz‐Institute of Freshwater Ecology and Inland Fisheries Müggelseedamm 310 12587 Berlin Germany
2. Department of Biological Sciences University of Calgary 2500 University Drive N.W. Calgary Alberta T2N 1N4 Canada
3. Fisheries and Aquatic Sciences Program School of Forest Resources and Conservation The University of Florida 7922 NW 71st Street Gainesville Florida 32653‐3071 USA
4. Wisconsin Department of Natural Resources Madison Wisconsin 53703 USA
5. Division of Integrative Fisheries Management Faculty of Life Sciences Humboldt‐Universität zu Berlin Philippstrasse 13, Haus 7 10115 Berlin Germany