これまで小規模な河川工事等でのオオサンショウウオの保護事例は多数あるが，今回のようにダム本体工事で，大規模に河川を転流し，オオサンショウウオを保護した事例はない． 今回の転流で，これまでの調査で発見が難しいとされてきた「孵化幼生後の幼生」を 36 個体保護した．これらの個体の保護場所は大きな石の下部が平らで出入りする隙間がないような環境，水際河岸（ヨシやササの浮き根等）であり，改めて，孵化幼生後の幼生の保護の際は，このような環境を重点的に調査する必要性が明らかになった．また，保護したタイミングは干し上げによる水位低下後が大半であったことから，水を抜いて調査することの重要性が再確認された. 今回の転流時におけるオオサンショウウオの確実な保護の取り組みは今後の類似事業にも適用できる可能性が高く，大いに参考になるものと考えている． なお，

The process for formulating a river management program in Japan has greatly changed. In 1997, the River Act was amended and, shifting from the conventional purpose of flood-control and irrigation, a comprehensive river management program was drawn up with the purpose of flood control, irrigation and environmental conservation. Here, for the first time, participation by residents was introduced, thereby reflecting their opinions. In the Kansai area, the Revised River Act was applied for the Yodogawa water system, and the Yodogawa Water Basin Council, consisting of academic experts and publicly recruited residents was established by the government and a Yodogawa water management program was formulated. However, during the formulating process, the four governors of Mie, Shiga, Kyoto and Osaka prefectures expressed their objections to the Daido dam construction in Shiga prefecture from the standpoint that flood prevention by river improvement should be prioritized over dam construction. On the other hand, the pro-Daido dam group insisted that the government complete construction of the dam. Consequently, the once simple interests of upper reaches and lower reaches residents, have developed into complex ones involving the project implementing body i.e. the national government, and the beneficiaries i.e. prefectures, municipalities, and local residents, resulting in a conflict concerning eliciting of an agreement. Based on such experience, I will discuss how to adjust interests regarding river management programs and the direction of local governments in the future.