Edible shellfish are a type of seafood that can be consumed as food. Oysters, clams, scallops, and mussels are all examples of edible shellfish. Oysters have a hard, rough shell and are usually eaten raw or cooked. Clams are small, soft-shelled mollusks that can be steamed, boiled, or eaten raw. Scallops are bivalve mollusks with a sweet flavor and are often served in soups or stews. Mussels are also bivalve mollusks and are usually steamed or boiled.