edited by Jens Krause, Professor of Fish Biology and Ecology, Humboldt University, Berlin, Germany, and Professor of Biology and Ecology of Fishes, Leibniz-Institute of Freshwater Ecology and Inland Fisheries, Berlin, Germany; Richard James, Senior Lecturer, University of Bath, UK; Daniel W. Franks, Reader in Complex Systems, University of York, UK; Darren P. Croft, Associate Professor of Animal Behaviour, University of Exeter, UK