[1] Univ Oslo, Dept Biosci, CEES, N-0316 Oslo, Norway
[2] Norwegian Water & Energy Directorate, N-0301 Oslo, Norway
[3] US Geol Survey, Silvio O Conte Anadromous Fish Res Ctr, Biol Resources Div, Turners Falls, MA 01376 USA
[4] Swedish Univ Agr Sci, Dept Wildlife Fish & Environm Studies SLU, SE-90183 Umea, Sweden
[5] Univ Oslo, Dept Math, N-0316 Oslo, Norway
[6] Norwegian Inst Nat Res NINA, N-0349 Oslo, Norway
[7] Fisheries & Oceans Canada, St John, NF A1C 5X1, Canada
[8] Cefas Lowestoft Lab, Lowestoft NR33 0HT, Suffolk, England
[9] Norwegian Inst Nat Res NINA, N-7485 Trondheim, Norway
[10] INRA, Agrocampus Ouest, UMR 0985, ESE, F-35000 Rennes, France
[11] Minist Dev Durable Environm Faune & Parcs Quebec, Direct Faune Aquat, Ste Foy, PQ, Canada
[12] Univ Oulu, Finnish Game & Fisheries Res Inst, FI-90014 Oulu, Finland
[13] Northeast Fisheries Sci Ctr, Maine Field Stn, Natl Marine Fisheries Serv, Orono, ME 04473 USA
[14] Inst Marine, Fisheries Ecosyst Advisory Serv, Newport, Mayo, Ireland
[15] Finnish Game & Fisheries Res Inst, Bothnian Bay Fisheries Res Stn, FI-94450 Keminmaa, Finland
[16] Norwegian Univ Sci & Technol, Sect Nat Hist, Museum Nat Hist & Archaeol, N-7491 Trondheim, Norway
[17] Agrifood & Biosci Inst, Belfast BT9 5PX, Antrim, North Ireland
[18] Conselleria Medio Rural Xunta Galicia, Secc Biodiversidade, Serv Conservac Nat Pontevedra, Pontevedra 36071, Spain
[19] Inst Freshwater Fisheries, IS-112 Reykjavik, Iceland
[20] Russian Acad Sci, Inst Biol, Karelian Res Ctr, Petrozavodsk 185910, Russia
[21] Vilt & Fiskeinfo AS, N-7054 Ranheim, Norway
[22] Plymouth Marine Lab, Remote Sensing Grp, Plymouth PL1 3DH, Devon, England
[23] Inst Marine Res, N-5817 Bergen, Norway
[24] Radgivende Biologer AS, N-5003 Bergen, Norway
[25] Inst Marine Res, Flodevigen Marine Res Stn, N-4817 His, Norway