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Preliminary study of migration history estimated from otolith Sr:Ca ratios of masu salmon (Oncorhynchus masou) in Lake Kussharo


Otolith Sr:Ca ratios of 11 masu salmon (Oncorhynchus masou) in Lake Kussharo and its tributaries, of which outlet river has no barriers to the ocean, were analyzed to estimate their migration histories. The Sr:Ca ratios of all masu salmon generally fluctuated below 2. Masu salmon from Lake Kussharo presumably do not migrate to the ocean. However, more specimens must be analyzed to clarify the migration history of masu salmon in this lake.

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We thank Toshio Izawa, Mahito Miyamoto, and Hiroyuki Sakamoto of Salmon and Freshwater Fisheries Research Institute, Hokkaido Research Organization; Tomohiro Katsumata, Masayoshi Koike, Tsunehisa Nakazawa, Jun Ueda, Ken Miyakawa, Masahiro Oomiya, and Hideaki Kanai of Tamagawa University; and Tomoaki Yamaguchi, Masaaki Okabayashi, Hitoshi Shimizu, and Kenichi Moriya of Teshikaga Town Office for helping with field surveys.

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Correspondence to Kiyoshi Kasugai.

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Kasugai, K., Hayano, H., Mano, S. et al. Preliminary study of migration history estimated from otolith Sr:Ca ratios of masu salmon (Oncorhynchus masou) in Lake Kussharo. Ichthyol Res 61, 178–182 (2014).

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  • Masu salmon
  • Lake Kussharo
  • Otolith Sr:Ca ratio