Proposal of Portable Fishway System Applicable to Agricultural Channels

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  • TAKAHASHI Naoki
    Department of Civil Engineering, National Institute of Technology, Kagawa College
  • MISAWA Yuki
    Graduate School of Environmental and Life Science, Okayama University
  • HONZU Mio
    Cherry Consultants Inc.
  • YANAGAWA Ryoichi
    Department of Civil Engineering, National Institute of Technology, Kagawa College
  • TAGAWA Tadashi
    Department of Civil Engineering, National Institute of Technology, Kagawa College
  • NAKATA Kazuyoshi
    Graduate School of Environmental and Life Science, Okayama University

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Other Title
  • 農業水路に適用可能な可搬魚道システムの提案
  • ノウギョウ スイロ ニ テキヨウ カノウ ナ カハンギョドウ システム ノ テイアン

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<p>In this study, we proposed a low cost portable fishway system for quick improvement of the flow condition on the rapid slope section of agricultural channels that divide habitats of aquatic animals. As a result of arranging the blocks for adjusting the flow condition in the fishway in a staggered array according to the length of the back water occurred by a block, the water depth was increased more than 5 times that before the installation of the fishway, and the flow velocity was reduced. In particular, the flow velocity immediately below blocks was reduced to about 20% of that before the installation, and it was thought that it would function as a resting place for aquatic animals using the fishway at the site. In field experiments, fish with a body length of 3.4 cm or less migrated upstream by the fishway. It was confirmed that small fishes used the migration environment constructed in a short time by the proposed fishway system.</p>

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