<総説>

速やかに河道内の遡上環境を改善するための簡易魚道の提案と現場での実証実験

高橋 直己^*，三澤 有輝^**，柳川 竜一^*，多川 正^*

Proposal of Portable Fishways that Enables Quick Improvement of Migration Environment in River Channels and the Field Experiments

Naoki TAKAHASHI^*, Yuki MISAWA^**, Ryoichi YANAGAWA^* and Tadashi TAGAWA^*

^* Department of Civil Engineering, National Institute of Technology, Kagawa College, 355 Chokushi-cho, Takamatsu, Kagawa 761-8058, Japan
^** Advanced Course in Industrial and Systems Engineering, National Institute of Technology, Kagawa College, 355 Chokushi-cho, Takamatsu, Kagawa 761-8058, Japan

Abstract

The installation of portable fishways is one of the effective solutions to support the upstream migration of aquatic organisms. The authors have been tried to develop portable fishways for volunteer activities and the demonstration experiments. Local residents can handle those fishways even if they don’t have the expertise. In some experiments, water depth and the flow velocity have been measured in fishway pools and partitions. Also, it has been confirmed in the field observation that the installation of the portable fishways enabled the upstream migration of small aquatic organisms such as juvenile Ayu fish and Gobies. This paper presents the flow characteristics of the portable fishways and the status of utilization of small aquatic organisms in several river fields.

Key Words: portable fishway, upstream migration, aquatic organisms, local flow, flow characteristics