0304.79.10 - Skinned, whether or not divided into pieces, and frozen into blocks each weighing over 4.5 kg, imported to be minced, ground or cut into pieces of uniform weights and dimensions

This HTS classification, 0304.79.10, specifically covers frozen fish fillets and other fish meat, originating from families such as Bregmacerotidae, Euclichthyidae, Gadidae, Macrouridae, Melanonidae, Merlucciidae, Moridae, and Muraenolepididae. The key characteristic for inclusion here is that the product, even if divided into pieces, is frozen into blocks exceeding 4.5 kg and is intended for further processing such as mincing, grinding, or cutting into uniformly weighted and dimensioned pieces. This distinct processing intent differentiates it from frozen fillets that are prepared for direct consumption without further significant processing.

The sibling category, 0304.79.50.00, designated as "Other," would encompass frozen fish fillets and meat from the specified families that do not meet the processing criteria outlined for 0304.79.10. In essence, this subcategory is for those products that are not frozen in large blocks for subsequent mincing or uniform cutting.

Within this category, further sub-classifications exist to identify specific types of fish. Subcategory 0304.79.10.10 is for Pollock, excluding Alaska Pollock, while 0304.79.10.15 pertains to Whiting (Merluccius spp.). The remaining items, not specifically identified by the preceding subcategories, fall under the "Other" designation within this group (0304.79.10.90), allowing for granular classification of various species within the defined processing parameters.