Why were red carp raised in rural wells in ancient times?

After eating too much, my stomach becomes too bloated.

You need to feed it with other fish feeds. It is not good to feed it only nematodes, and it will easily make it greedy. Don't feed him too much or too much at one time. Red carp has no sense of hunger and fullness and will eat as much as you feed. It's probably because you fed him too much and he ate too much, so his belly got bigger and his scales became raised. It's bloated~ It's okay. Just pay more attention in the future.