Abstract
The endangered species Lefua echigonia is an index species for spring water environments, and the flagship species for Yato. It will live in Yato with maintained fields. This study examined its life history in such Yato, and proposed conservation measures relating to after farmland consolidation to maintain this species. The study examined millraces and brooklets in three Yato located near the source of the Misawa River, a branch of the Tama River. Environment and capture-recapture surveys clarified differences in the life history according to the waterway environment of Yato. It is important to make small waterways that function during the non-irrigation period, and to leave weirs in the waterways, so that this species is retained after farmland consolidation.
