0303.63.00 - Cod (Gadus morhua, Gadus ogac, Gadus macrocephalus)

This HTS classification, 0303.63.00, specifically covers frozen cod. The description clarifies that this includes the species *Gadus morhua* (Atlantic cod), *Gadus ogac* (Greenland cod), and *Gadus macrocephalus* (Pacific cod). These are whole or otherwise unprocessed frozen fish, excluding fillets and other fish meat that would fall under heading 0304.

Within the broader category of frozen fish from specific families (Bregmacerotidae, Euclichthyidae, Gadidae, etc.), this subheading distinguishes itself by focusing exclusively on cod species. It differs from sibling categories such as 0303.64.00.00 (Haddock), 0303.65.00.00 (Coalfish), and 0303.66.00.00 (Hake), which all represent distinct fish species within the same hierarchical level.

The subcategories for 0303.63.00 further refine the classification. Subheading 0303.63.00.10 is designated for Atlantic cod, while 0303.63.00.90 covers all other cod species classified under this main heading. This distinction is important for trade statistics and potentially for specific import regulations or tariff treatments that may apply to different geographical origins or species within the cod family.