Development of small-scale fishway and farmers participatory works for preserving ecological corridor in rice paddy areas
2007
Oohira, Y.(Kyushu Univ., Fukuoka (Japan)) | Nakano, Y. | Yuge, K. | Hayashida, H.
The objective of this study is to recover and to preserve the ecological corridor composed by the irrigation and drainage channels. During paddy rice growing season, water channel networks are divided into various sections by the many weirs for irrigation. Specially designed flume type small fishway was developed for helping migration of fishes and other aquatic animals through the channel networks. The advantages of this fishway are as follows, 1) light weight and strong structure made of aluminum, 2) easy to set up and to remove in normal channels, 3) seasonal migration of aquatic animals are controllable by the farmers, 4) shapes of pools are deformable to fit the target animals. The hydraulic conditions of water flow in the fishway were carefully investigated by a laboratory experiment. From the field's observations, it was proved that this fishway did not only impede usual agricultural water management and was but also suitable for the migration of aquatic animals.
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