What fish can't be eaten? (brain teaser)?

Brainstorm what fish can't be eaten. The answer is that wooden fish cannot be eaten. The origin of the name of wooden fish, built day and night, is carved like a fish to warn people to think day and night. When chanting, the bronze chime is used to control chanting. The wooden fish is ball-fish-shaped, with a hollow abdomen, an opening in the middle of the head, a curling tail at the end, a sloping back tapping part, a triangular side and an oval bottom. Wooden pestle, its head is olive-shaped, and it looks like a fish.

The name of the wooden fish

The name of Muyu was first seen in the revised rules written by the monk Huaihai Zen Master in the Tang Dynasty: Muyu, according to legend, often wakes up day and night, and is struck by carved wooden statues, so it is confusing. Accordingly, wooden fish should be created by Buddhist monks. There is a saying that warns monks not to forget to practice day and night. It was said before that the predecessor of Muyu was a simple wooden block called Muyue, and later it was carved into the image of a fish called Muyu. Because it is not included in the court music, the official history of the past dynasties has not been included.