Abstract
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 (0.5–4.0 × 10−3) near the core, which thereafter increased to brackish water levels (4.0–6.0 × 10−3), and then to seawater levels (6.0–10.0 × 10−3) 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.
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Acknowledgments
We thank Sarufutsu Sakhalin Taimen Conservation Group for providing helpful information on H. perryi. We are grateful to Sarufutsu Fisheries Cooperative Association and Fujimoto Fisheries Company for supplying specimens. Thanks to Dr. Shiro Sagawa, Aqua Restoration Research Center, Public Works Research Institute, and Mr. Masahiro Kusunoki, Hokkaido Government Souya General Subprefectural Bureau, for providing information about the habitat river of H. perryi. We also thank Dr. Michael J. Miller for critical comments and helping to improve the manuscript. This study was supported by a Grant-in-Aid for JSPS Fellows (no. 21·10170) to K.S., and by a Grant-in-Aid for scientific research (no. 21380122) from the Ministry of Education, Culture, Sports, Science, and Technology of Japan to T.O.K.
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The author Kyoko Suzuki is Research Fellow of the Japan Society for the Promotion of Science.
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Suzuki, K., Yoshitomi, T., Kawaguchi, Y. et al. Migration history of Sakhalin taimen Hucho perryi captured in the Sea of Okhotsk, northern Japan, using otolith Sr:Ca ratios. Fish Sci 77, 313–320 (2011). https://doi.org/10.1007/s12562-011-0335-x
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DOI: https://doi.org/10.1007/s12562-011-0335-x