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Differences in oxygen and carbon stable isotope ratios between hatchery and wild pink salmon fry

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Abstract

We examined differences in otolith oxygen (δ18Ootolith) and carbon (δ13Cotolith) stable isotope ratios between hatchery and wild pink salmon fry. The δ18Ootolith values of hatchery and wild fry were −7.7 ± 0.2 ‰ and −8.3 ± 0.3 ‰ (1σ), respectively. This difference reflected differences in temperature conditions experienced by each fry. The δ13Cotolith values of hatchery and wild fry were −19.2 ± 0.3 ‰ and −11.1 ± 1.8 ‰ (1σ), respectively. The lower δ13Cotolith values of hatchery fry were probably related to their intake of artificial diets. Discriminant analysis of δ18Ootolith and δ13Cotolith values demonstrated a highly significant difference between hatchery and wild fry with 95.8 % classification accuracy. Therefore, analysis of δ18Ootolith and δ13Cotolith precipitated in the fry stage may be useful for discriminating the origin of returning adult pink salmon. The discrimination method for returning adult fish would provide important information for evaluating the effect of hatchery release and their impact on the wild population.

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Acknowledgments

We thank Dr. Michael J. Miller of the Ocean Research Institute, the University of Tokyo, for critically reading the manuscript and the staff of Hokkaido National Fisheries Research Institute for providing samples of pink salmon fry. This study was supported by a Sasakawa Scientific Research Grant from the Japan Science Society to Y.T. and Grant-in-Aid for Scientific Research (B) from the Japanese Society for the Promotion of Science (JSPS) to T.O. (No. 17380113, No. 21380122, No. 24380105).

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  1. Yasuo Tomida

    Present address: Stock Conservation Group, Hokkaido National Fisheries Research Institute, Fisheries Research Agency, Nakanoshima, Toyohira, Sapporo, Hokkaido, 062-0922, Japan

Authors and Affiliations

  1. International Coastal Research Center, Atmosphere and Ocean Research Institute, The University of Tokyo, Otsuchi, Kamihei, Iwate, 028-1102, Japan

    Yasuo Tomida & Tsuguo Otake

  2. Agriculture, Forestry and Fisheries Research Council Secretariat, 1-2-1 Kasdumigaseki, Chiyoda-ku, Tokyo, 100-8950, Japan

    Toshiya Suzuki

  3. Department of Earth Science, Graduate School of Science, Tohoku University, Aramaki, Aoba-ku, Sendai, Miyagi, 980-8578, Japan

    Tsutomu Yamada & Yasufumi Iryu

  4. Department of Physics and Earth Science, Faculty of Science, University of the Ryukyus, Senbaru, Nishihara, Okinawa, 903-0213, Japan

    Ryuji Asami

  5. Nemuro Field Station, Hokkaido National Fisheries Research Institute, Fisheries Research Agency, Nakashibetsu, Shibetsu, Hokkaido, 086-1109, Japan

    Hirofumi Yaegashi

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  1. Yasuo Tomida
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  2. Toshiya Suzuki
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  7. Tsuguo Otake
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Correspondence to Yasuo Tomida.

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Tomida, Y., Suzuki, T., Yamada, T. et al. Differences in oxygen and carbon stable isotope ratios between hatchery and wild pink salmon fry. Fish Sci 80, 273–280 (2014). https://doi.org/10.1007/s12562-014-0699-9

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  • DOI: https://doi.org/10.1007/s12562-014-0699-9

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