Restoration work of water environment for recovery of Wild Japanese Crested Ibis on the Sado Island

我们修改了河堤，调整了河流坡度，消除了鱼类活动的障碍，还在岛上的天野河设置了鱼廊，让鱼在河流、灌溉沟渠和稻田之间自由移动。在河流中，我们没有发现丰度和生物多样性的差异，可能是由于修改后的调查时间较短；如果我们继续监测，我们预计会从鱼类那里找到一些反应。另一方面，在设置了鱼道的稻田中，鱼的生物量显著增加。

We modified river dikes and adjusted the stream grade to remove the barriers for fish movement and also installed fish corridors to allow the fishes to move freely between rivers, irrigation ditches, and rice paddy fields at the Tenno River in the island. In the river, we have found little difference in the abundance and biodiversity probably due to the short length of time investigated after the modification ; we expect to find some responses from the fish if we continue the monitoring. On the other hand, the fish biomass significantly increased in the paddies where the fish passes had been set.