1. Department of Morphology, Faculty of Veterinary Medicine, Ghent University, Salisburylaan 133, Merelbeke 9820, Belgium
2. Institute for Agricultural and Fisheries Research, Animal Sciences–Fisheries, Ankerstraat 1. 8400, Oostende, Belgium
3. Department of Pathology, Bacteriology, and Poultry Diseases, Faculty of Veterinary Medicine, Ghent University, Salisburylaan 133. 9820, Merelbeke, Belgium
4. Research Group, Evolutionary Morphology of Vertebrates, Department of Biology, Faculty of Science, Ghent University, K. L. Ledeganckstraat 35. 9000, Ghent, Belgium
5. Department of Comparative Physiology and Biometrics, Faculty of Veterinary Medicine, Ghent University, Salisburylaan 133. 9820, Merelbeke, Belgium
6. Norwegian Institute of Food, Fisheries, and Aquaculture Research, Muninbakken 9-13, Breivika Post Office Box 6122. 9291, Tromsø, NO, Norway