Water Management in Unimproved Paddy Fields Connected with Dual-purpose-channel and Those State of Use by Fishes

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  • MINAGAWA Akiko
    Faculty of Agriculture, Tokyo University of Agriculture and Technology
  • NISHIDA Kazuya
    Faculty of Agriculture, Tokyo University of Agriculture and Technology
  • FUJII Chiharu
    Faculty of Agriculture, Tokyo University of Agriculture and Technology
  • SENGA Yutaro
    Faculty of Agriculture, Tokyo University of Agriculture and Technology

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Other Title
  • 用排兼用型水路と接続する未整備水田の構造と水管理が魚類の生息に与える影響について
  • ヨウハイケン ヨウガタ スイロ ト セツゾク スル ミセイビ スイデン ノ コウゾウ ト ミズ カンリ ガ ギョルイ ノ セイソク ニ アタエル エイキョウ ニ ツイテ

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Abstract

Paddy fields having good connection with dual-purpose-channel have been disappearing by land consolidation projects and urbanization. This study clarified how fish use such paddy fields in relation with rice farming to examine a future expected model of the area. As a result of investigation, the following became clear. 1) Paddy fields functioned as reproduction field for Misgurnus anguillicaudatus, Gnathopogon elongatus elongatus, Carassius spp., Cobitis biwae, and as growth field for fries which were born in other water area. 2) M anguillicaudatus used paddy fields as habitat through irrigation term, but G elongatus elongatus didn't use paddy fields after midsummer drainage. 3) The velocity of drainage water was almost the same velocity as that adult fishes were promoted to carry out ascending migration at water outlet. 4) It was suggested that increase of fish biomass in a paddy field is influenced by the structure of water inlet and outlet from which fish can escape easily.

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