KITAMI, Hokkaido--A tiny device at what is known as the smallest aquarium in Hokkaido has kept ... while another wanted to “learn about fish that can be found in rivers in my hometown.” ...

Anything strike you as special about this fish here? Well, it's worth 1.8 million dollars. It won grand champion at the All Japan Koi Show in 2017, and is the most expensive koi fish ever sold.