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Shellfish is a culinary and fisheries term for exoskeleton-bearing aquatic invertebrates used as food, including various species of molluscs, crustaceans, and echinoderms.Although most kinds of shellfish are harvested from saltwater environments, some kinds are found in freshwater.ome crustaceans commonly eaten are shrimp, lobster, crayfish, and crabs. Echinoderms are not as frequently harvested for food as molluscs and crustaceans; however, sea urchin roe is quite popular in many parts of the world. Most shellfish eat a diet composed primarily of phytoplankton and zooplankton.
Fortunately, shellfish is an ingredient that is rarely âhiddenâ in foods. Shellfish may be found in fish stock, seafood flavoring (for example, crab extract), sushi and surimi. In the U.S., if a packaged food contains shellfish, labeling regulations require the specific shellfish be listed.