Zebrafish's body is slender, slightly spindle-shaped, its head is small and slightly sharp, and its snout is short. The whole body is covered with many dark blue longitudinal stripes like zebras, which are alternately arranged with silvery white or golden yellow longitudinal stripes. Swimming in groups in an aquarium, just like zebras running on the African grassland, is called zebra fish. The genetic similarity between zebrafish and human is as high as 87%, and its advantages as a model organism are outstanding, which means that its experimental results are applicable to human body in most cases. It can usually be used to monitor the water quality environment. Zebrafish is also a kind of good fish.