EFFECTS OF SLOPE AND SPACES OF BUNCH OF BRUSHES IN FISH LADDER FOR EELS ON MIGRATION RATE OF <i>Anguilla japonica</i>

• ONITSUKA Kouki

  九州工業大学大学院 建設社会工学研究系

• IZUMI Kousuke

  九州工業大学大学院 工学府建設社会工学専攻

• SAKO Tomoya

  九州工業大学大学院 工学府建設社会工学専攻

• MINESHITA Souya

  九州工業大学 工学部建設社会工学科

• MIYAGAWA Tomoyuki

  九州工業大学 工学部建設社会工学科

• MOTOMATSU Nanami

  九州工業大学 工学部建設社会工学科

Bibliographic Information

Other Title

• ウナギ用魚道に設置したブラシ束の間隔と傾斜角がウナギの遡上特性に及ぼす影響

Abstract

 It is estimated that the number of eels (Anguilla japonica) is decreased by the worse of river environment, so fish ladder for eels is necessary in the river. Bunch of burshes or grass are put on fish ladder for eels. However, little is known about typical space, diameter of bunch of brushes and migrating characteristics of eels. This study was made to evaluate the migration rate of eels under the condition that slope and space of bunch of brushes in fish ladder are changed. As a result, it was found that migration rate decreases with an increase of slope and space of bunch of brushes. On the other hand, it was proven that sinuosity of eels and averaged migrating speed tend to increase. Besides, it was confirmed that eels migrated with getting caught by brushes and on the brushes to the upside.

Journal

• Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering)

  Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering) 74 (5), I_439-I_444, 2018

  Japan Society of Civil Engineers

Keywords

• Anguilla japonica
• fish ladder for eels
• brush
• slope
• migration rate

Details

• CRID: 1390846609779427200
• NII Article ID: 130007757775
• DOI: 10.2208/jscejhe.74.5_i_439
• ISSN: 2185467X
• Web Site: https://www.jstage.jst.go.jp/article/jscejhe/74/5/74_I_439/_pdf
• Text Lang: ja
• Data Source:
  • JaLC
  • Crossref
  • CiNii Articles
• Abstract License Flag: Disallowed