0304.81 - Pacific salmon (Oncorhynchus nerka, Oncorhynchus gorbuscha, Oncorhynchus keta, Oncorhynchus tschawytscha, Oncorhynchus kisutch, Oncorhynchus masou and Oncorhynchus rhodurus) Atlantic Salmon (Salmo salar) and Danube salmon (Hucho hucho):

This HTS category, 0304.81, specifically addresses frozen fillets and other minced fish meat derived from a defined group of salmon species. It encompasses Pacific salmon varieties such as *Oncorhynchus nerka* (Sockeye salmon), *Oncorhynchus gorbuscha* (Pink salmon), *Oncorhynchus keta* (Chum salmon), *Oncorhynchus tschawytscha* (Chinook salmon), *Oncorhynchus kisutch* (Coho salmon), *Oncorhynchus masou* (Masu salmon), and *Oncorhynchus rhodurus* (Red-spotted masu salmon). Additionally, it includes Atlantic salmon (*Salmo salar*) and Danube salmon (*Hucho hucho*). The key distinguishing feature of this category is the specific identification of these salmon species as the source of the fish meat.

This classification is distinct from its siblings, such as 0304.82 covering trout species, or 0304.83 for flat fish. While all these categories fall under frozen fish fillets and other fish meat (0304.8), 0304.81 is exclusively dedicated to the aforementioned salmon species, differentiating it based on the biological classification of the fish. For instance, while trout are also salmonids, they are categorized separately under 0304.82.

Within this salmon-specific category, subcategories further refine the classification based on the processing and intended use of the frozen product. 0304.81.10.00 is for skinned fillets, frozen into blocks exceeding 4.5 kg, which are specifically imported for subsequent mincing, grinding, or cutting into uniform pieces. The remaining products, not meeting these specific processing criteria, are classified under 0304.81.50, representing a broader "Other" designation for frozen salmon fillets and meat not destined for the specialized processing described in the preceding subcategory.