Can wooden fish eat round with their mouths?

Muyu's mouth is round and can't be eaten.

According to the data of Blue Animal Network, there is a circle on the mouth of wooden fish belonging to the upper lip, which contains something harmful to human body, so there is a circle on the mouth of wooden fish that cannot be eaten.

Wooden fish is made of bonito. Before use, the fish is shaved into shavings, so it is called wooden fish.