Impact of Drainage Channel Improvement Works on Fish Biota

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  • 農業排水路の改修が魚類相に与える影響
  • 農業排水路の改修が魚類相に与える影響--生態系配慮工法を導入した大江排水路の事例
  • ノウギョウ ハイスイロ ノ カイシュウ ガ ギョルイソウ ニ アタエル エイキョウ セイタイケイ ハイリョ コウホウ オ ドウニュウ シタ オオエ ハイスイロ ノ ジレイ
  • —生態系配慮工法を導入した大江排水路の事例—
  • — A case study of Ooe drainage channel improved with eco-friendly works —

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Impact of concrete lining of channel bed with eco-friendly works, i.e. fish pools and fish habitat blocks on fish biota in Ooe drainage channel is discussed based on the ecological, hydraulic and water quality investigations from 2003 through 2007. The effectiveness of these eco-friendly technologies is also evaluated. As a result, the followings become apparent; 1) Several species which are suitable for improved channels, especially in their spawning, e.g. Pseudorasbora parva, Gambusia affinis affinis, Squalidus chankaensis sp. and Rhinogobius sp. tend to increase relatively and the species e.g. Oryzias latipes and Channa argus decrease oppositely. 2) Fish biota settles down to a certain level after 3 or 4 years after improvement of channel. 3) Fish show their preference to eco-friendly technologies like fish habitat block and fish pool and also utilize them as their habitat during non irrigation period, and 4) the total number of fish tends to somewhat decrease at large, but the number of species tends to increase contrarily in the channel through improvement with eco-friendly works.

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