Oyster
Oyster,
any member of the families Ostreidae (true oysters) or Aviculidae
(pearl oysters), bivalve mollusks found in temperate and warm coastal
waters of all oceans. Bivalves known as thorny oysters (Spondylus) and saddl oysters(Anomia) are sometimes included in the group.
True oysters have been cultivated as food for more than 2,000 years. Pearl oysters also have long been valued for the precious pearls that develop in them. (See also pearl.)
The two valves of the oyster shell, which differ in shape, have rough surfaces that are often a dirty gray. The upper valve is convex, or higher at the middle than at the edges. The lower valve, fixed to the bottom or to another surface, is larger, has smoother edges, and is rather flat. The inner surfaces of both valves are smooth and white.
True oysters have been cultivated as food for more than 2,000 years. Pearl oysters also have long been valued for the precious pearls that develop in them. (See also pearl.)
The two valves of the oyster shell, which differ in shape, have rough surfaces that are often a dirty gray. The upper valve is convex, or higher at the middle than at the edges. The lower valve, fixed to the bottom or to another surface, is larger, has smoother edges, and is rather flat. The inner surfaces of both valves are smooth and white.
Oyster
Oyster
Oyster
Oyster
Oyster
Oyster
Oyster
Oyster
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