“Mizube-no-Kowaza” fishway Industry-Academia-Government Collaboration.
Journal of National Fisheries University Volume 60 Issue 1
Page 37-42
published_at 2011-10
Title
産官学の協働でつくる「水辺の小わざ」魚道
“Mizube-no-Kowaza” fishway Industry-Academia-Government Collaboration.
Source Identifiers
[PISSN] 0370-9361
Creator Keywords
Mizube-no-Kowaza
Fishway
Weir
Migration
Diadromous aquatic
In Japan, many diadromous aquatics migrate for reproduction and/or growth between the seas and the rivers during their life history. They include many commercially important species for river fisheries, e.g. the ayu fish Plecoglossus altivelis, the Japanese eel Anguilla japonica, the Japanese mitten crab Eriocheir japonica, and so on. Many artificial structures like weirs and dams are constructed in the rivers of Japan and they become barrier walls that block migration. Most of the structures have fishways for big fish, e.g. salmon and trout, but those fishways are not always suitable for small diadromous animals. I have conducted a joint research with Yamaguchi Prefecture to improve the existing fishways with a low-cost and simple method of construction. The “Mizube-no-Kowaza” fishway is a slope type fishway having protruding boulders on its bed. The term of “Mizube-no-Kowaza” means a collection of small-scale devices for the improvement of river structures. We aim to connect the upper stream with the lower stream for aquatic organism’s migration by adopting the “Mizube-no-Kowaza” method. It can be constructed at low cost because of its simple structure. The “Mizube-no-Kowaza” fishway is effective in increasing wild resource of river dwellers by promoting networks among habitats isolated by manmade structures.
Languages
jpn
Resource Type
departmental bulletin paper
Publishers
National Fisheries University
Date Issued
2011-10
File Version
Version of Record
Access Rights
open access
Relations
[ISSN]0370-9361