Skinned haddock fillet blocks weighing over 4.5 kg each, imported to be minced, ground, or cut into uniform pieces, are classified under 0304721000. Retail or food-service fillets not meeting those specifications fall under 0304725000 (or 0304720000 for the general line). The end-use condition in 0304721000 means importers must be able to document the processing intent if CBP requests verification.

China processes significant volumes of North Atlantic haddock caught by Icelandic or other fleets, then re-exports the fillets to the US. The country of origin for tariff purposes is China, but sustainability certifications (such as MSC) and catch documentation should trace back to the original fishery. Buyers with sustainability commitments or retail customers requiring chain-of-custody certification should request full traceability documentation from their Chinese processors.