Oyster stew in a can

On this Wikipedia the language links are at the top of the page across from the article oyster stew in a can. Some types of pearl oysters are harvested for the pearl produced within the mantle.

True oysters are members of the family Ostreidae. Almost all shell-bearing mollusks can secrete pearls, yet most are not very valuable. Pearls can form in both saltwater and freshwater environments. The largest pearl-bearing oyster is the marine Pinctada maxima, which is roughly the size of a dinner plate. Not all individual oysters produce pearls naturally. In nature, pearl oysters produce pearls by covering a minute invasive object with nacre.