There are two pieces of that stone, called otoliths. It is used to transmit sound signals and keep the body balanced. Large and small yellow croaker are called sagittal otoliths.

This kind of otolith will appear larger in the ichthyidae fish, but it actually exists in other fish. People are no exception. ...

You can search Baidu Encyclopedia Otolith/view/3018019.htm for details.

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The ancients believed that burning otolith into powder and then taking it could treat urinary calculi (gonorrhea), such as kidney calculi's and bladder calculi. There are also urine obstruction, detoxification such as poisonous mushrooms, arsenic from various poisonous snakes, food poisoning and so on.

Li Shizhen's Compendium of Materia Medica once wrote that the yellow croaker "was born in the East China Sea, shaped like a white fish, with a flat body, weak bones, fine scales, yellow as gold, and two white stones in the head, clean as jade, hence the name stone fish."

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Otolith is mainly composed of calcium salt crystals, which is a small calcification in inner ear lymph. Besides the above otoliths and sagittal otoliths, they are also called otoliths according to their functions.

Modern medicine has proved that this thing is not good for stones. However, if humans get this kind of disease, such as otoliths that are too small or of different sizes or fall off, it will lead to serious seasickness, airsickness and paroxysmal dizziness.

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If there is no doubt, please adopt it.