あまり知りませんでした。
“岐阜県不破郡垂井町垂井”の相川沿いの公園で、
約３５０匹のこいのぼりが春風を受けて泳いでいるらしい。
これが、恒例行事”鯉のぼり一斉遊泳”。
全国から寄せられた”鯉”のぼりが、川を風に吹かれて登る。
雪が残る”伊吹山”の”雪解け水を全開で
泳ぐ鯉のぼり、先人は子供が生まれ五月五日節句に願いを込めて
上げるらしい。

I did not know much.
In the park along the Aikawa of “Talito Terui Town Fuwa Gulf, Gifu Prefecture”
It seems that about 350 carp streams are swimming under the influence of the spring breeze.
This is an annual event “Koinobori swimming at the same time”.
“Carp” climbs received from all over the country climb the river blown in the wind.
Snow remains “Ibukiyama” ‘s thawing water at full throttle
Koinobori to swim, the predecessor was born a child and wishes with a wish on May 5 A festival
It seems to rise.
https://headlines.yahoo.co.jp/hl?a=20170423-00004089-gifuweb-l21.view-000