Seafood is any sea animal that is served as food or is suitable for eating. This usually includes seawater animals, such as fish and shellfish (including mollusks and crustaceans). By extension, in North America although not generally in the United Kingdom, the term seafood is also applied to similar animals from fresh water and all edible aquatic animals are collectively referred to as seafood.
Edible seaweeds are rarely considered seafood, even though they come from seawater and are widely eaten around the world. See the category of sea vegetables.
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