Frozen fillets of flatfish other than halibut are classified here, making the halibut exclusion the critical classification boundary for importers sourcing species such as flounder, sole, plaice, or turbot. FDA oversight under the seafood HACCP regulation applies at entry, and country-of-origin labeling requirements under COOL apply at retail. Accurate species identification on commercial invoices and packing lists is essential to avoid reclassification disputes between this line and halibut-specific provisions.

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