Creek grouper, also known as grouper and mountain grouper, etc. , is a kind of brook fish, which grows slowly. The average individual is only about 10 cm, which is much smaller than the familiar crucian carp.

Goldfish, belonging to CYPRINIDAE, is an ornamental fish, which is slowly improved from crucian carp and is relatively easy to raise. China was the first country to domesticate goldfish, and goldfish were fed in some ancient courtyards. There are not a few domestic goldfish now.