1. Institute of Oceanology; Polish Academy of Sciences; Powstanców Warszawy 55 81-712 Sopot Poland
2. Department of Migratory Fishes Synów Pułku 37, 80-298 Gdansk; Inland Fisheries Institute; Olsztyn Poland
3. Centre for Integrative Genetics (CIGENE); Norwegian University of Life Sciences; Postboks 5003, 1432 Ås Norway
4. Estonian Marine Institute; Tartu University; EE-12618 Tallinn Estonia
5. State Research Institute on Lake and River Fisheries (GosNIORKH); Makarova emb., 26, St. Petersburg 199053 Russian Federation
6. Institute of Ecology of Nature Research Centre; Akademijos str. 2 LT-08412 Vilnius-21 Lithuania
7. Technical and Environmental Services; Municipality of Bornholm; Skovløkken 4, Tejn 3770 Allinge Denmark
8. National Marine Fisheries Research Institute; Kołłataja 1 81-332 Gdynia Poland