Bivalve mollusks — oysters, clams, mussels, and scallops — imported fresh or chilled must originate from growing areas certified under the National Shellfish Sanitation Program (NSSP) or an equivalent foreign authority recognized by FDA, adding a layer of admissibility review beyond standard Seafood HACCP. Crustaceans such as shrimp, crab, and lobster face a different regulatory profile but are equally subject to antidumping scrutiny; shrimp from several Asian and Latin American origins have been subject to longstanding antidumping orders. Frozen shellfish products generally require country-of-origin marking and, for certain species, SIMP harvest documentation.

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