number of access : ?
number of downloads : ?
ID 115512
Title Alternative
Development of migrating board at water outlet of rice paddy field for upstream migration of fish
Author
Minagawa, Akiko The University of Shiga Prefecture
Wakamiya, Shinji Fukken
Takeshita, Kuniaki Fukken
Sagawa, Shiro University of Hyogo
Murase, Jun Nagoya University
Tsuzuki, Takayoshi Japan RiverFront research Center
Fukazawa, Yoji Ministry of Land, Transport and Tourism
Ezaki, Yasuo University of Hyogo
Keywords
paddy field
agricultural drainage channel
fish
migration
fishway
Content Type
Journal Article
Description
Flashboards are set in the water outlets of paddy fields to manage water depth of the fields. Fish can enter paddy fields through the water outlets of the fields when water overflows due to rainfall and continuous irrigation. However, these flashboards often block fish migration. Therefore, we devised four types of migrating boards, namely, flat type, V-shape type, 5 mm guiding wall type, and 20 mm guiding wall type. These migrating boards cover the top of the flashboard and connect the water surfaces of paddy fields and the top pools of fishways. Upward migration tests on Carassius spp., Gnathopogon elongatus elongatus, Misgurnus anguillicaudatus, and Oryzias spp. were conducted using these boards. The highest number of fish migrated when using the 20 mm guiding wall type board. A total of 374 times of migration were observed for three of the four species; that is, migration was not observed for Oryzias spp., which was found to be unable to migrate probably due to the too strong currents for the species in these set-ups. The 20 mm guiding wall type migration board enabled smaller-sized fish to swim just inside the guiding wall and larger-sized fish to swim at the center of the guiding wall. Based on these observations, we concluded that the 20 mm guiding wall-type migrating board is the most effective in promoting fish migration.
Journal Title
Ecology and Civil Engineering
ISSN
13443755
18825974
NCID
AA11528360
Publisher
応用生態工学会
Volume
23
Issue
1
Start Page
79
End Page
84
Published Date
2020-09-28
EDB ID
DOI (Published Version)
URL ( Publisher's Version )
FullText File
language
jpn
TextVersion
Publisher
departments
Science and Technology