The Mitsui & Co. Environment Fund

Introduction to Grant Projects

Nippon Baratanago Takayasu Research Group

Conserving forest water systems in the Takayasu no Sato area of Yao, Osaka, and developing simple biotopes to naturally regenerate Japanese rosy bitterling populations

Activity grant

Project Description

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.

Marine resources/foodPreservation of surface soil and forestsPreservation of biodiversity and ecosystem
Grant year
FY2010 Activity Grants
Grant term
3 years
October 2010 - September 2013
Grant amount
10,740,000 yen
Activity region
Takayasu area, Yao, Osaka, Japan
Conducting research in a reservoir serving as a rosy bitterling habitat

Overview of the Organization

Yoshihiko Kano, Representative Director
Yoshihiko Kano, Representative Director
Establishment purpose
The Nippon Baratanago Takayasu Research Group was established by residents of Osaka and surrounding areas to conserve local woodland and aquatic environments and maintain their biodiversity by first working to protect Japanese rosy bitterlings, a rare freshwater fish species. It also actively engages in basic scientific research, develops conservation methods, and provides education on animals and the environment and consulting services related to aquatic environments in order to benefit regional communities.
Main area of activity
Yao, Osaka, Japan
2 full-time staff members, 10 part-time staff members, 100 full members
Annual operating budget
5.89 million yen in 2007, 7.50 million yen in 2008, 8.68 million yen in 2009
Recent activities
  • (1) Maintaining conservation ponds and carrying out regular biological research in order to conserve Japanese rosy bitterlings
  • (2) Forest conservation to maintain healthy aquatic environments in the Takayasu area
  • (3) Water purification
    ·Scientifically analysing the effects of ikeboshi pond draining
    ·Developing methods for removing blue-green algae and curbing its propagation
  • (4) Researching the biodiversity of local woodland and mountain areas
  • (5) Analysing Japanese rosy bitterling gene divergence
  • (6) Environmental education
    ·Holding regular 'bitterling academies' for students from elementary school to university age
  • (7) Raising awareness of Japanese rosy bitterling conservation
  • (8) Creating a network of local industries in the Takayasu area