Affiliation: | 1.Inst. Freshwater Research, Dep. Aquatic Resources, Swedish University of Agricultural Sciences, 178 93, Drottningholm, Sweden ;2.Fishery Research Station, Dep. Aquatic Resources, Swedish University of Agricultural Sciences, 814 90, ?lvkarleby, Sweden ;3.National Marine Fisheries Research Institute, ul. Ko???taja 1, 81-332, Gdynia, Poland ; |