A terraced fishway that achieves a threefold upstream migration rate! Fish can ascend from any direction at 180°, preventing their stagnation!
The terraced fishway has a 180-degree opening that is not found in traditional fishways, allowing fish to ascend from anywhere within the fishway. In our own ascent survey, approximately 70 percent of the fish ascended from both sides of the fishway, and it has been confirmed that fish can ascend without lingering. 【Features】 ■ Fish can ascend from anywhere with a 180-degree opening, preventing fish from lingering. ■ It has a maintenance-free structure that prevents sediment accumulation. ■ During low water periods, water is drawn from the collection ditch beneath the floor. ■ It achieves stable quality and simple construction as a fishway. *For more details, please request materials or view the PDF data available for download.
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basic information
This is a fishway with a 180-degree opening that allows for upstream passage from both sides, featuring a highly effective design for fish migration. It is a unique slit-type fishway with pools made of cobblestones, allowing fish to choose their own paths for upstream migration in various flow conditions. Additionally, due to its distinctive 20 cm pool shape, it requires no maintenance, and investigations after flood events have shown no sediment accumulation, while the functionality of the fishway is confirmed to be well maintained. We have developed fishway blocks with a depth of 1 m, a width of 1.5 m, and a thickness of 20 cm to 35 cm, which are available for use. In the case of on-site construction, there are issues with not being able to sufficiently secure the cobblestones during compaction, and the quality of the fishway can vary depending on the contractor. By producing fishway blocks as secondary products, the quality of the fishway after construction can be adequately ensured, and the construction period can also be shortened. These have been adopted by the Ministry of Land, Infrastructure, Transport and Tourism, various prefectures, and municipalities, with numerous construction achievements. We offer assistance and proposals for design, so please feel free to contact us.
Price information
Please contact us. *Subject to change depending on the transportation location.
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Applications/Examples of results
【Purpose】 It is effective in alleviating drop heights of around 2 meters at river dams. Existing fishways 【Track Record】 ○ Many sites including the Ministry of Land, Infrastructure, Transport and Tourism, Gifu Prefecture, Yamanashi Prefecture, Kumamoto Prefecture, and Hokkaido.
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Company information
Yamachin Group is supported by the understanding and guidance of many people, and with the corporate philosophy of "creativity, ingenuity, and tireless effort," we are committed to contributing to the local community alongside the development of our company. By engaging in civil engineering projects that involve nature, we consider how to conduct construction with respect for the natural environment, learn many lessons from it, and aim to create a "distinctive company" among numerous construction contractors. In 1991, we established the Environmental Division and began "environmental conservation activities unique to the construction industry," developing and proposing various environmental products such as natural stone block series for river environment conservation, various fishway series tailored to installation locations, and the "Hybrid Eco Pump," an underwater pump that operates without electricity. We have worked on promoting and raising awareness of environmentally friendly construction methods. Thanks to this, we have been adopted in numerous projects, and we are grateful to be contributing to environmental conservation. Yamachin Group will continue to take on challenges through the construction industry, working on "proposals dedicated to the natural environment of our hometown" and contributing to global environmental conservation.