shellfish

This term encompasses a broad category of marine animals, primarily mollusks and crustaceans. In culinary and commercial contexts, it is treated as a collective group rather than individual species, often evoking images of luxury seafood or coastal dining. Grammatically, shellfish is a mass noun when referring to the food source or the group as a whole. It does not typically take a plural form in standard usage; one refers to a quantity of shellfish rather than shellfishes.