Utilization of paddy field by Hotoke loach -Case study of Yatsu paddy field in the upper stream of the Okuri River-

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  • Mitsuo Yoshito
    United Graduate School of Agriculture, Tokyo University of Agriculture and Technology
  • Nishida Kazuya
    United Graduate School 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
  • ホトケドジョウによる水田の利用実態-大栗川上流域の谷津田を事例として-
  • ホトケドジョウ ニ ヨル スイデン ノ リヨウ ジッタイ オオクリガワ ジョウリュウイキ ノ ヤ ツダ オ ジレイ ト シテ

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To evaluate how Lefua echigonia use paddy fields, we studied the so-called "yatsuda" paddy fields in Tokyo from April through November of 2006. The investigation consisted of trapping fish that migrate between the paddy fields and the irrigation channel, followed by a distributional survey at the channel. In the analysis, we compared the results of each item assessed for Lefua echigonia with those for Misgurnus anguillicaudatus and found that while both L. echigonia and M. anguillicaudatus bred in the paddy fields, the main breeding site for L. echigonia was apparently the channel. These results along with the observation that many juvenile L. echigonia enter the paddy fields suggest that the paddy fields function mainly as the growth place for L. echigonia. It was also found that L. echigonia tended to exit the paddy fields at the point of water entry.

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