The Effects of Log Mattress Bank Protection on Inhabitation Fish from Differences in Environment Settings

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  • 設置環境の違いからみた井桁護岸の生息魚類に対する効果
  • セッチ カンキョウ ノ チガイ カラ ミタ イゲタ ゴガン ノ セイソクギョルイ ニ タイスル コウカ

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In form land consolidation area drainage canals, fish habitat environments are worsening because the banks of rectilinear canals are protected by concrete. In order to improve fish habitat environments, void structural objects such as a log mattress have recently been constructed for river bank protection. This study aims to grasp the characteristics of fish habitats in the context of log mattresses used for river bank protection. The author constructed an artificial log mattress for research, which was positioned in an agricultural drainage environment (St.I (a monotonous environment)) and a small-sized river (St.II (a natural waterside environment)), in order to conduct investigations. <br>This study revealed the following. <br>(1) The artificial log mattress functioned as a habitat for a lot of fish, 10 species of six families in St.I and 11 species of seven families in St.II. <br>(2) Dominant fish were Carassius sp., Misgurnus anguillicaudatus and Pseudobagrus tokiensis in St. I, and Phoxinus logowskii steindachneri, Misgurnus Anguillicaudatus and Pseudobagrus tokiensis in St.II. <br>(3) In the concrete structure environment (St.I), the internal fish habitat density was high. <br>(4) The difference in habitat density between the surrounding area and inside showed that Pseudobagrus tokiensis have a specific inside preference for both St.I and St.II

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