Space will make it difficult for fish to survive. Moreover, according to the principle that the Eight Diagrams of the Book of Changes are mutually reinforcing, the number of fish is 3, 6, 7, 9, 13, 17, 18, 19, 2 1. Generally speaking, it is appropriate for all legal persons to raise nine kinds of fish. Ancient literati like to paint fish, and all of them take "Nine Rus" as the topic. What are nine Rus? According to ancient records, there is a saying in the Book of Songs: "In the sky, Baoding is as prosperous as hills, mountains, mountains, mountains, like the sun, like the life of Nanshan, like pines and cypresses." In this poem, * * * has nine words "Ru", and they are all auspicious words, so many people draw nine fish as auspicious hanging pictures. From the above, we can know that raising fish is the best. Love to use in South China, Hong Kong and Macao. The specific figure depends on the date of birth of the head of household to calculate how much to raise this year, which is too complicated, so I will skip it here.