Influence of Environmental Factors and Paddy Field on Habitat of Freshwater Fishes at Irrigation Channel in an Urbanizing Area

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  • NISHIDA Kazuya
    United Graduate school of Agriculture, Tokyo Univ. of Agri. and Tech.
  • SENGA Yutaro
    Faculty of Agriculture, Tokyo Univ. of Agri. and Tech.

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Other Title
  • 都市近郊における農業水路の環境要因および水田が魚類の生息に及ぼす影響
  • トシ キンコウ ニ オケル ノウギョウ スイロ ノ カンキョウ ヨウイン オヨビ スイデン ガ ギョルイ ノ セイソク ニ オヨボス エイキョウ トウキョウト ヒノシ ノ ノウギョウ スイロ オ ジレイ ト シテ
  • A case study of irrigation channels in Hino-city, Tokyo
  • 東京都日野市の農業水路を事例として

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Abstract

The purpose of this study is to grasp living conditions of freshwater fishes and those habitats in irrigation channels of urbanizing area, to demonstrate the factors that influence habitat of freshwater fishes. This study was carried out in four seasons from December 2001 to November 2002 on Hino-channel, Ne-river, Toyoda-channel and Mukoujima-channel flowing through Hino-city. Objectives of the survey were fishes, hydraulic conditions, water qualities and physical environment of channels. In summer, juvenile and immature of Carassius carrassius subsp. 1, Misgurs anguillicaudatus and Gnathopogon elongatus appeared in large quantities at the sampling site that was located near paddy fields locally. Connections between channels and the paddy fields enabled fishes to migrate from channels to the paddy fields upward. It is suggested that the paddy fields have function of spawning and growing of juvenile and immature of fishes living in the channels. The decrease in water depth at lower of reaches has negative influence on habitat of fishes in winter.

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