Pseudo Rasbora (pseudo Rasbora? Parva), also known as arhat fish, is a kind of CYPRINIDAE, native to Asia, but it has become an invasive species because it was introduced into Europe. The first generation of the first-generation green male fish had a slightly longer head and a wide and smooth figure. The head is pointed and slightly flat. Shut up. No need. There are no spines on the dorsal fin. During the breeding period, the male fish is darker in color, and pearl stars appear on the snout and cheeks. The male fish is big and the female fish is small. The difference is obvious.