Japanese rosy bitterlings are an endangered carp species. They inhabit some water systems in Osaka, Shikoku and Kyushu, and have been found in ponds in the Takayasu area of Yao, Osaka. The Nippon Baratanago Takayasu Research Group has repaired four reservoirs in the area and is maintaining and managing them as conservation ponds, and it is also working on upstream forested areas of nearby rivers to stabilise water levels to enable these reservoirs to fulfill their original function as agricultural water sources. This project will continue undergrowth clearing and tree-thinning work to maintain upstream areas of the nearby Korigawa River, research the effects of traditional ikeboshi pond draining as a method for restoring water quality, and develop alternative methods. It will also lease unused agricultural land to create simple biotopes for regenerating rosy bitterling and Chinese pond mussel populations. It is hoped that these actions will help conserve the Japanese rosy bitterling by improving aquatic environmental conditions in the Takayasu area, and also create small-scale local flower growing businesses and secure a water supply for local agriculture, leading to the creation of a regional network.