While browsing the depths of the internet I came across images and articles about the clean gutters of Japan. Apparently they're so clean that koi spawn in their exceptionally clean waters. I explore this claim.

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Sources
https://mymodernmet.com/koifishswim...
https://www.city.shimabara.lg.jp/comm...
https://www.mlit.go.jp/sogoseisaku/re...
https://asia.nikkei.com/Spotlight/Env...
https://en.wikipedia.org/wiki/Mount_U...
https://www.city.shimabara.lg.jp.e.dk...

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