The food group Shellfish includes what varieties of food ?
They are often informally known as Dublin Bay prawns , though the term " prawn " can be confusing since it is sometimes used to describe several varieties of shellfish : the first group includes members of the lobster family such as scampi ( " langoustine " in French and " cigala " in Spanish ) , while the second takes in large shrimp , particularly those that live in fresh water .