The residual flatfish fillet line at 0304430090 captures fresh or chilled fillets of any flatfish species not specifically enumerated — such as sole, turbot (other than Greenland turbot), dab, or brill — making correct species identification the central classification challenge. Importers relying on this line should document species clearly, since CBP may challenge entries where a named species (e.g., flounder or plaice) is present but not declared. FDA admissibility review applies, and species-specific labeling requirements under COOL and FDA seafood regulations add a compliance layer beyond tariff classification.

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