James S. Diana is Emeritus Professor of Fisheries and Aquaculture and Former Director of the Michigan Sea Grant College Program in the School of Natural Resources and Environment, University of Michigan, Ann Arbor, MI, USA. Tomas O. Höök is Professor of Fisheries Biology in the Department of Forestry and Natural Resources, Purdue University, West Lafayette, IN, USA, and Director of the Illinois-Indiana Sea Grant College Program.