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Spatial expansion and increased population density of masu salmon parr independent of river restoration

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Abstract

Spatial expansion and increased population abundance of masu salmon Oncorhynchus masou have been recently reported following habitat restoration in some rivers, but no studies have examined these types of changes under natural conditions. We found spatial expansion and increased population density of masu salmon parr in rivers of eastern Hokkaido where no habitat restoration had occurred during the period examined. Changes in the distribution and population densities of parr are often regarded as effects of river habitat destruction and restoration, yet such changes should be evaluated while taking into account the effects of other ocean environmental conditions as well.

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Acknowledgements

We thank Kazumasa Ohkuma for obtaining the sampling permit issued by the Governor of Hokkaido; Michio Fukushima for providing a database of freshwater fishes of Hokkaido Island (Hfish), which was especially helpful for choosing which rivers to study; Megumi Ohya for helping with fish sampling; Masaki Ichimura and Tsuyoshi Tamate for providing invaluable information on salmon habitat in the Pon-ironebetsu River system; and Kazushi Miyashita and Mari Kuroki for their support and encouragement. The research was supported by JSPS KAKENHI Grant Numbers 15J01925, 17J05544, 17K12839 and 25450293.

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Authors and Affiliations

  1. Graduate School of Agriculture and Life Sciences, University of Tokyo, Bunkyo, Tokyo, 113-8657, Japan

    Genki Sahashi

  2. Hokkaido National Fisheries Research Institute, Japan Fisheries Research and Education Agency, Sapporo, Hokkaido, 062-0922, Japan

    Kentaro Morita

  3. Gero Branch, Gifu Prefectural Research Institute for Fisheries and Aquatic Environments, Gero, Gifu, 509-2592, Japan

    Daisuke Kishi

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  1. Genki Sahashi
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  2. Kentaro Morita
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Correspondence to Genki Sahashi.

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Sahashi, G., Morita, K. & Kishi, D. Spatial expansion and increased population density of masu salmon parr independent of river restoration. Ichthyol Res 65, 496–501 (2018). https://doi.org/10.1007/s10228-018-0628-5

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  • DOI: https://doi.org/10.1007/s10228-018-0628-5

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