The commercial invoice and health certificate should identify the fish by scientific name. Importers can cross-reference the scientific name against the eight covered families — Bregmacerotidae, Euclichthyidae, Gadidae, Macrouridae, Melanonidae, Merlucciidae, Moridae, and Muraenolepididae — using FAO species databases or a licensed customs broker with seafood expertise. When species identity is uncertain, a CBP binding ruling is advisable before the first shipment.

Hake (family Merlucciidae) in non-fillet, non-steak form would fall under this residual line, since the US schedule does not have a dedicated 10-digit line for hake within heading 030453. Brazil appears among the top supplier countries for this heading, consistent with South American hake sourcing. Importers should document the species and cut form clearly to support the residual classification.