Shellfish

Cooked mussels Shellfish is a term used to describe shelled molluscs and crustaceans used as food. Shelled molluscs include the clam, mussel, oyster, winkle and scallop; some crustaceans are the shrimp, prawn, lobster, crayfish, and crab. Squid, octopus and terrestrial snails, though edible and biologically similar to mollusc shellfish, are generally not considered to be shellfish. Some other marine animals, such as sea urchins, are also considered to be shellfish, but they are less co ...