Salmon (Japanese calls it "Sake") is a very familiar fish, perhaps next to Tuna, "Maguro". As grown salmons have the instinct to come back to their own birthplaces and spawn for next generation, those born in Tone River are coming back again this year after circling the great Pacific Ocean.

Tone Canal Management and Construction Office of Japan Water Agency is holding the "2017 Tone Barrage Salmon Run-ups and Roe Extracting Day" on Saturday, 11th November, 2017 at Tone Barrage, which is located in the middle reaches of Tone River, 154 km from the estuary.

This observation day event is held every year and there are quite a large number of visitors, children and grown-ups, coming to the site, observing dynamic salmon run-ups on the fish way as well as roe extracting work. It is a good chance for children to directly watch and learn a part of the nature conservation effort of salmons and learn a bit about the functions of the barrage for our better lives.