What god is grandma fish fairy?

The so-called "Fish Fairy" is just an entertainment divination circulating in the local area, which is purely entertainment and has no scientific basis.

Actually, it's a boring behavior, and I don't quite understand it. It's just that my mother reminds me of something for divination every time she buys this kind of fish. There is an interesting custom in Suzhou, which is to "swear" the fish fairy to make a wish at the dinner table. Because "fish" in Wu dialect is homophonic with "Wu", it sounds like "Wu".

The so-called "fish fairy" is a small triangular cartilage in the fish head. It is said that there is aura on it. If you throw it out of the air, you will make a wish in your heart. If it is still standing when you fall off the table, your wish will come true.