Affiliation: | Toya Lake Station for Environmental Biology, Faculty of Fisheries, Hokkaido University, Abuta, Hokkaido, 049–57 Japan, JP Department of Biology, College of Arts and Sciences, University of Tokyo, Komaba, Tokyo, 153 Japan, JP Hokkaido Salmon Hatchery, Sapporo, Hokkaido, 062 Japan, JP Department of Fisheries, Faculty of Agriculture, University of Tokyo, Bunkyo, Tokyo, 113 Japan, JP Division of Biological Sciences, Graduate School of Science, Hokkaido University, Sapporo, Hokkaido, 061 Japan, JP Department of Biology, Faculty of Fisheries, Hokkaido University, Hakodate, Hokkaido, 041 Japan, JP
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