<P> Pescetarianism (/ ˌpɛskəˈtɛəriənɪzəm /; also spelled pescatarianism) is the practice of following a diet that includes fish or other seafood, but not the flesh of other animals . </P> <P> Those on pescetarian or pollotarian diets may define meat only as mammalian flesh and may identify with vegetarianism . Most pescetarians maintain a lacto - ovo vegetarian diet with the addition of fish and shellfish, described as "fish but no other meat". The common use association between such diets and vegetarianism has led groups such as the Vegetarian Society to state that diets containing these ingredients are not vegetarian . </P>

What is a person who only eats fish and vegetables