“Koi are from Asia, and they are among the most beautiful and amazing fish in the world. “
Toyota Supras are Asian too, and they are one of the coolest cars ever made.
Even a stopped clock is right twice a day. Asia still exports junk both natural and man-made.
And release Koi into alien waters and watch it collapse the ecosystem too.
You must not be familiar with koi prices. We don’t pay through the nose just to release koi into the wild. They’re for koi and garden ponds.
But if koi push your buttons, here’s another Asian fish: bettas/Siamese Fighting Fish. They are non-invasive. Their favorite food is mosquito larvae. And they are BEAUTIFUL.
https://www.shutterstock.com/search/beautiful+betta?search_source=base_keyword
Maybe bettas are considered invasive. I read an article that said they are endangered. However, a different article claims they can be invasive. Frankly that’s not my metric. Both they and koi are among the most beautiful fish on earth. I’m very glad for Asia, as we’d have neither breed without it.
Here’s some non-invasive koi art. It looks good on the walls.