Shellfish allergies are irreversible, but approximately 60 percent of people with the allergy don't experience a reaction until adulthood. Less commonly, a severe allergic reaction can occur, known as anaphylaxis . 1 decade ago. Fresh prawns, whether raw or cooked, should smell fresh and clean, not fishy, and should look moist. 0 0. In terms of their body makeup, shrimp have a side plate that overlays segments in front and behind; prawns side plates overlap tile-like from front to back. Most species of shellfish are found in marine habitats. Anonymous. You may want to avoid seafood restaurants entirely since people with severe shellfish allergies have had allergic reactions simply from breathing in particles of allergens from shellfish that is being steamed, fried, or boiled. Prawns are in the shrimp be exact, it is the largest. If you have a shellfish allergy, you'll need to be extremely careful when dining out. The very small shellfish referred to as shrimps are prawns, too – the term shrimp just indicates their diminutive size. Yes – prawns and shellfish are common allergens. Speak to your GP if you experience any concerning symptoms, such as a tickly throat or cough, sneezing or an itchy tongue after consuming prawns. They have a very delicate shell as small shrimp have and are mostly found in warm currents of the ocean. What are Shellfish? Source(s): Crustacean shellfish include crabs, prawns, shrimps, crayfish and lobsters, whilst mollusk shellfish includes mussels, oysters, cockles, scallops, clams, etc. The term prawn is used particularly in the United Kingdom, Ireland, and Commonwealth nations, for large swimming crustaceans or shrimp, especially those with commercial significance in the fishing industry. Choose the best prawns. Are Prawns Shellfish. Prawn is a common name for small aquatic crustaceans with an exoskeleton and ten legs (which is a member of the order decapoda), some of which can be eaten.. If allergies of any type are common in your family, you are at a higher risk of developing a shellfish allergy. Avoiding Shellfish in Restaurants . Avoid any that look dry or that have broken or cracked shells. Fish and shellfish are an important part of a healthy diet. Each of these types of shellfish has different types of gills; shrimp have lamellar (plate-like) gills, while prawns' gills are branching. Mozambique in east Africa has some of the best prawns. Shellfish is a broad term used for crustaceans and mollusks with exoskeletons or calcareous shells.