Oysters are bivalve mollusks that live in saltwater or in brackish environments (water with more salt than fresh, but not as much as actual seawater). As such, oysters are found in estuaries, ocean and saltwater environments, and in brackish lakes.

True oysters (edible varieties) come from the Ostreidae family; pearl oysters come from the Pterioida order. Oysters have an abductor muscle which attaches the shells to each other, and acts as a hinge for opening and closing.

Oyster reef at about mid-tide off a fishing pier at Hunting Island State Park, South Carolina. Courtesy Jstuby via Wikimedia. Public domain.

Oyster reef at about mid-tide off a fishing pier at Hunting Island State Park, South Carolina. Courtesy Jstuby via Wikimedia. Public domain.

Identifying Characteristics and Biology

  • All oysters are bivalve creatures connected by a hinge.
  • Abductor muscles contract and release enabling the shells to open and close.
  • Oyster shells have characteristic rough and uneven edges, unlike the clam which have smooth, relatively even shells.
  • Oysters are grown for both food and for the pearls they produce.

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Range and Habitat

  • Oysters are found all over the world.
  • Oysters can be found on the hard bottoms of the ocean floor or the floor of brackish environments.
  • They can also be cultivated in cages, racks, or bags, if they are protected from predators.

Market Forms

  • Raw or cooked.

Oyster Varieties

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