1. IMARES Wageningen UR; PO Box 167 1790AD Den Burg The Netherlands
2. Department of Aquatic Ecology and Water quality Management; Wageningen UR; PO Box 47 6700AA Wageningen the Netherlands
3. Minnesota Department of Natural Resources MN DNR; Biometrics Unit; 5463-C W Broadway Forest Lake MN 55025 USA
4. Department of Fisheries, Wildlife and Conservation Biology; University of Minnesota; St. Paul MN 55108 USA
5. Institute of Biodiversity, Animal Health and Comparative Medicine; College of Medicine, Veterinary & Life Sciences; University of Glasgow; Graham Kerr Building Glasgow G12 8QQ UK