According to Wei Chong's inquiry. Com, parrot fish have the most prosperous fortune in raising five or nine. Nine and five are auspicious numbers, and they are called the ninth five-year plan. The numbers used to describe the emperor are bound to be auspicious. Among yang numbers, nine is the largest number, five is in the middle, and the ninth five-year plan represents the authority of the emperor, which is called the ninth five-year plan supreme.