What does Lanshou goldfish juvenile elimination fish mean?

Killing fish is explained below.

There are many criteria for elimination of Lan Shoumiao, such as the body is too short, the back is convex or collapsed, the tail is too large or too small, or it is crooked, the length of the tail tip is inconsistent, etc. To raise this kind of fish artificially, it is generally necessary to provide a certain amount of light, and at the same time, it must be fed regularly and quantitatively. The water temperature should be kept at about 15-25°C, and the water must be changed regularly. This can ensure the cleanliness of the water body and prevent the fish from Sick.