1. Department of Neuroscience, Uppsala University, SE-751 24 Uppsala, Sweden
2. Department of Chemistry, Umeå University, SE-901 87 Umeå, Sweden
3. Faculty of Fisheries and Protection of Waters, South Bohemian Research Center of Aquaculture and Biodiversity of Hydrocenoses, University of South Bohemia in Ceske Budejovice, Zátiší 728/II, 389 25 Vodňany, Czech Republic
4. Department of Biology, Norwegian University of Science and Technology, EU2-167 Trondheim, Norway
5. Department of Wildlife, Fish and Environmental Studies, Swedish University of Agricultural Sciences, SE-901 83 Umeå, Sweden