Goldfish evolved from crucian carp, and grass species are the closest to crucian carp. Externally, their bodies are laterally compressed and spindle-shaped. If subdivided, it can be divided into three categories, namely, gold crucian carp, grass goldfish and red and white flower goldfish. Among them, the tail fin of the golden crucian carp is short and the whole body is orange-red. The grass goldfish with normal tail has a strong constitution and is very suitable for novice breeding. The long tail is more ornamental, especially the swallowtail with long tail and short body, which looks very beautiful.
Wen Zhong is also a relatively old variety, because from top to bottom, the fish body is similar to the word "Wen" in seal script, so it is named after it. This fish is shorter, looks more round, eyes do not bulge, dorsal fin is normal, and anal fin and caudal fin are double-lobed. Its color is very rich, red, red and black, red and white, purple and multicolored and so on. Common varieties are lion head, high head, gold, pearl and so on, of which lion head is more famous.
Dragon species and Wen species look similar, the only difference is that the eyes of the dragon species are protruding outside the eye socket. According to the shape of the eyes can be divided into three categories, namely, chess type, apple type and bulb type, their difference lies in the distance of the eyes protruding, chess type protruding is not high, apple type protruding is more obvious, bulb type protruding most.
The characteristic of egg kind goldfish is that it has no dorsal fin, its body is shorter and fatter, it looks like a duck egg, and it has no dorsal fin. The tail fin is long and short, the long tail is called Danfeng, and the short tail is called egg. The more expensive varieties are red eggs, pompon eggs, tiger heads and so on.
