For fish fillets, country of origin is generally the country where the fish was caught or harvested, not where it was filleted, unless substantial transformation occurred during processing. However, when fish caught in one country are shipped to a third country for filleting and then exported to the US, the origin determination can be complex. CBP binding rulings are advisable for supply chains involving multi-country processing.

Yes. Certain frozen fish fillets — notably frozen fish fillets from specific origins — have been subject to antidumping duty orders. The applicability depends on the specific tariff line and the country of origin, so importers should consult current Commerce Department and CBP order lists and factor potential antidumping duties into landed-cost calculations before contracting.