1. Department of Biology, Section of Ecology, FI-20014 University of Turku, Finland
2. Department of Environmental and Biological Sciences, University of Eastern Finland, FI-70211 Kuopio, Finland
3. Department of Aquaculture, Institute of Veterinary Medicine and Animal Sciences, Estonian University of Life Sciences, EE-51014 Tartu, Estonia
4. Latvian Biomedical Research and Study Center, Rātsupītes iela 1, LV-1067 Rīga, Latvia