Arowana, an ancient fish, is a red hard-scaled fish. The reproductive ability is weak, the female fish lays eggs, and the male fish hatches in the mouth. Among the freshwater ornamental fish, there are four most expensive ones, namely orange, pink, crimson and blood red, among which blood red is the most beautiful and precious, and the quantity is very small. Due to the influence of loong culture, arowana has become the embodiment of auspiciousness, which means auspiciousness is transported into treasure, so it is called Feng Shui fish. Washington wildlife protection treaty 1980 lists it as a class A protected animal.