The blue face of butterflies in Sanhu Lake is better than that in Huang Kuan. According to the relevant public information, Blue Face is also called Pearl Butterfly Fish, which is relatively easy to raise. Pearl butterfly fish likes weak alkaline water and belongs to omnivorous fish in feeding habits. Pearl butterfly fish has a special feature, that is, it will change color, and its body color is different in the two stages of childhood and adulthood, which makes it much more fun to breed blue-faced fish. Huang Kuan, also called yellow broadband butterfly fish, is a naturally aggressive ornamental fish. This kind of fish has a very strong territorial consciousness and aggressiveness. This kind of fish has a weak constitution. When it is not acceptable for food, the yellow broadband butterfly fish will have obvious diarrhea, which makes it difficult to raise this kind of fish. Compared with these two kinds of fish, the blue face of butterfly in Sanhu Lake is more beautiful and easy to breed than that in Huang Kuan.