Migration history of Sakhalin taimen Hucho perryi captured in the Sea of Okhotsk, northern Japan, using otolith Sr:Ca ratios

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• 作者：Kyoko Suzuki (1)
  Tomoyasu Yoshitomi (2)
  Yoichi Kawaguchi (3)
  Masaki Ichimura (4)
  Kaneaki Edo (5)
  Tsuguo Otake (1)
  
• 关键词：Sakhalin taimen ; Migration ; Rare species ; Anadromous ; Otolith Sr ; Ca ratios ; Conservation
• 刊名：Fisheries Science
• 出版年：2011
• 出版时间：May 2011
• 年：2011
• 卷：77
• 期：3
• 页码：313-320
• 全文大小：395KB
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• 作者单位：Kyoko Suzuki (1)
  Tomoyasu Yoshitomi (2)
  Yoichi Kawaguchi (3)
  Masaki Ichimura (4)
  Kaneaki Edo (5)
  Tsuguo Otake (1)
  
  1. International Coastal Research Center, Atmosphere and Ocean Research Institute, The University of Tokyo, 2-106-1 Akahama, Otsuchi, Iwate, 028-1102, Japan
  2. Field Studies Institute for Environmental Education, Tokyo Gakugei University, 4-1-1 Nukuikitamachi, Koganei, Tokyo, 184-8501, Japan
  3. Division of Ecosystem Design, Institute of Technology and Science, The University of Tokushima, 2-1 Minami-josanjima, Tokushima, 880-8506, Japan
  4. Shibetsu Salmon Museum, 1-1 Kita 1-Jo Nishi 6-Chome, Shibetsu, Shibetsu-gun, Hokkaido, 086-1631, Japan
  5. Monuments and Sites Division, Agency for Cultural Affairs, Marunouchi 2-5-1, Chiyoda-ku, Tokyo, 100-8959, Japan
  

文摘

Sakhalin taimen Hucho perryi populations have decreased drastically to near extinction. It is urgent to establish an effective conservation strategy based on an understanding of the characteristics of migration and habitat use of this species. We examined the migration history of anadromous Sakhalin taimen captured off the Sarufutsu coast, northern Hokkaido, Japan, using otolith Sr:Ca ratios and also examined the relationship between their otolith Sr:Ca ratios during freshwater and seawater residence in a rearing experiment. Otolith Sr:Ca ratios of some fish from the Sarufutsu coast showed freshwater levels (0.5-.0?×?10?) near the core, which thereafter increased to brackish water levels (4.0-.0?×?10?), and then to seawater levels (6.0-0.0?×?10?) in the outermost regions. Those findings indicate that specimens from the Sarufutsu coast migrated to the brackish water region or the sea and spent most of their lives there. The anadromous migration pattern including the timing of downstream migration seems to be flexible among individuals in the species. They migrate between freshwater and seawater or brackish water several times during their lives, showing extensive habitat use. It is essential to secure the continuity among the freshwater, brackish water, and seawater areas for their effective conservation.