What do the 9 fish feng shui represent?

The ancient literati liked to make pictures of swimming fish, and they were all titled "Jiuru". What is Jiuru? According to ancient books, there is a saying in the Book of Songs: "The heaven protects you, so that nothing fails to rise. It rises like a mound, like a hill, like a mausoleum, like a river. When it reaches you, nothing fails to increase. Like the perseverance of the moon, the rise of the sun, Just like the longevity of Nanshan, it will never collapse, just like the luxuriance of pines and cypresses, it will never fail.” There are nine "ru" characters in this poem, and they are all auspicious words. Because "ru" has the same sound as fish, many people draw nine fishes and inscribe them "Jiuru" as an auspicious hanging picture. It can be seen from the above that the optimal number of fish to raise is nine.