1. Department of Ecology & Environmental Science, Umeå University, SE-90187 Umeå, Sweden
2. Department of Wildlife, Fish, and Environmental Studies, Swedish University of Agricultural Sciences (SLU), SE-90183 Umeå, Sweden
3. Department of Chemistry, Umeå University, SE-90187 Umeå, Sweden
4. Faculty of Fisheries and Protection of Waters, South Bohemian Research Center of Aquaculture and Biodiversity of Hydrocenoses, Research Institute of Fish Culture and Hydrobiology, University of South Bohemia in Ceske Budejovice,
Zátiší 728/II, 389 25 Vodňany, Czech Republic