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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.
Shellfish allergy is the most common food allergy among adults in the United States. It's actually much more common in adults than children: about two percent of American adults have a shellfish allergy, and only 0.1 percent of children have the condition. Unlike many food allergies, shellfish allergy is more likely to develop in adulthood than in early childhood. The majority of people who have shellfish allergy have their first reaction as adults. Once you develop a shellfish allergy, it tends to be severe and lifelong.