In the Amazon River in South America, it can be regarded as a tropical fish, with a body length of 2 meters, which is generally kept in aquariums. If the average water depth is 1 meter, it has an area of at least 20 square meters. It costs a lot to keep the water temperature above 24 degrees in winter for a pool of this size.

It can be mixed with silver dragon and Genghis Khan shark with similar size.

Koi fish is a cold-water fish, which is easy to lack oxygen at high temperature and is not suitable for mixed culture with tropical fish.

In addition, the fish was almost eaten by people in the country of origin, and there was no report of eating people. I have touched this fish in an aquarium in Shanghai, and I feel quite docile.