1. Laboratory of Fish Demography and Hydroecology, Management of Aquatic Resources and Aquaculture Unit, Freshwater and Oceanic Science Unit of Research-FOCUS, University of Liège, 22 Quai E. Van Beneden, B-4020 Liège, Belgium
2. SPWARNE-DNF-Public Service of Wallonia-Fisheries Service, 15 Avenue Prince de Liège, B-5100 Jambes, Belgium
3. SPWARNE-DNF-Public Service of Wallonia-Agriculture, Natural Ressources & Environnement, Wildlife & Forestry Department, 15 Avenue Prince de Liège, B-5100 Jambes, Belgium