What does the Buddha mean when he says fish are fun?

The fish here refers to wooden fish, and it is fun for Buddhists to knock wooden fish. Wooden fish is also a musical instrument.

Wooden fish is often accompanied by "Brahma Blowing" (a religious song) in Buddhism, which has a strong religious color. Wang Qi's Sanyanhui in the Ming Dynasty said: "Wooden fish, carved in the shape of a fish, is empty in it, with a loud knock. ..... Today, Shi's praise is used by Brahma. " Since the Ming Dynasty, it has been popular among the people, used to rap Muyu songs and accompany Kunqu opera. According to Li Dou's "Painting a Boat in Yangzhou" in Qing Dynasty, wooden fish was one of the musical instruments used in the theater at that time. Later, it was gradually used for song and dance accompaniment and instrumental ensemble. At present, wooden fish is not only used in Buddhist and Taoist music, but also widely used in various forms of instrumental ensembles and bands.