The distinction between 160521 (not in airtight containers) and 160529 (in airtight containers) reflects different preservation methods and shelf-stability profiles. Airtight containers — typically hermetically sealed cans or retort pouches — indicate a commercially sterile product, while non-airtight packaging covers refrigerated or frozen prepared shrimp. The container type at importation determines classification.

Yes. All prepared or preserved aquatic invertebrates under this heading, including sea cucumbers (160561) and jellyfish (160563), are regulated as seafood by FDA and must comply with HACCP-based seafood safety regulations. Some sea cucumber species may also be subject to CITES review depending on origin and species.