Picking method: If you meet a large-sized mackerel, you can dissect the head of the fish body joint parts, retrieve the throat near the jaw, there is no ring set in the fish bone, but relatively independent, not associated with other fish bones of the heart-shaped foreign body. Generally the naked eye that is visible with the other bones of the obvious differences, found with a screwdriver or knife and other prying can be.

The location of the mackerel stone in the fish: the location of the mackerel stone is in the upper part of the fish's throat, the upper jaw area.

The location where the tip of the knife points to is where the mackerel stone is located