Hamako sweetfish

In Yokohama City, with the aim of enhancing the attractiveness of Katabira River and revitalizing local communities, Yokohama City is working with citizens to create an environment that is easy to live, environmental activities, and events.

◆Working in FY2017
Saturday, June 24, 2017: 1st working "Hamako Ayu and River Playing" in Katabira River
Saturday, August 26, 2017: Take a look at the 2nd working! Know me! Think about it! Working Let's learn about the river with Ayu!
Saturday, January 26, 2018: The 3rd Working "Kickoff for Making a Good River!"
Saturday, March 3, 2018: 4th Working "Let's think about the goals of river creation!"

◆Working in FY2016
Saturday, December 10, 2016: 1st Working ~ Treasure Hunting of Rivers and Town ~
Sunday, January 22, 2017: 2nd working ~ More fun! Let's draw the future of Katabira River! ～
Sunday, February 26, 2017: What do you do? The first step! ～

Ayu in Yokohama is said to have disappeared in the 1940s. After that, the water quality of rivers progressed, and since it was reconfirmed in 1989, it has now been confirmed in many rivers in the city. Ayu larvae were confirmed in Katabira River in 2007, and larvae were found in many rivers in the city in the following 20 years. Fish paths were developed at the head of the Katabira River Yoga Shimo-Hashimoto stream and the junction of Naka-Horikawa from FY2009 to FY2011, and Ayu was confirmed near the head of the Tsurumine Hashimoto-ryu upstream. A certain effect was confirmed on improving the moving environment of fish by improving the fishway.

In Yokohama City, in the “Future Town Development Strategy” of the Medium-Term Four-Year Plan 2014-2017, in order to promote easy-to-living and attractive town development that everyone wants to live and want to continue living. Yokohama ".

Click here for details (PDF: 1,425KB)

In Katabira River, fishways were developed at the head of the Katabira River Yoga Shimo-Hashimoto River and the confluence of Naka-Horikawa from FY2009 to FY2011, and ayu was found near the head of the Tsurumine Hashimoto-ryu upstream.
In response to the fact that a certain effect has been confirmed in improving the moving environment for fish in Katabira River, Yokohama City has formulated the Katabira River Action Plan in which Ayu goes up.
This plan is designed to contribute to the biodiversity of the entire aquatic organisms, with the aim of improving the upstream environment and living environment of fish, etc., using Ayu as an index species.
It is also positioned as a pilot experimental project plan in order to consolidate knowledge about the ideal way of citizen collaboration through river development, and to provide feedback to the master plan for the development of Yokohama, a city where Ayu goes up.

Action Plan Ayu goes up Katabira River
Click here for materials (PDF: 6,516KB)

Action Plan (Summary Version) Katabira River Action Plan (Summary Version)
Click here for materials (PDF: 1,379KB)

◆Development of fishways
Notice: We have newly established a fishway in Katabira River! ！