0304.83.10 - 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 category, 0304.83.10, specifically classifies frozen fillets of other fish that belong to the flat fish families, such as Pleuronectidae, Bothidae, Cynoglossidae, Soleidae, Scophthalmidae, and Citharidae. The key defining characteristic for this subcategory is that the fish meat is imported in blocks weighing over 4.5 kg, which are intended for subsequent processing into minced, ground, or uniformly sized and dimensioned pieces. This ensures a consistent and efficient manufacturing process for the final product.

Distinguishing this category from its sibling, 0304.83.50 (Other), is crucial. While 0304.83.50 would cover any other frozen flat fish fillets not meeting the specific processing criteria of 0304.83.10, this category is reserved for those destined for further size and texture alteration. The emphasis here is on the intermediate stage of processing and the intended end-use for creating specific food products.

This level further subdivides to provide greater specificity within the flat fish group. The subcategories, such as Greenland turbot (0304.83.10.10), Sole (0304.83.10.15), and Flounder (0304.83.10.20), allow for precise identification of the species of flat fish being imported. This granular detail is important for trade statistics, potential trade agreements, and specific import/export regulations that may apply to different types of seafood. The "Other" provision within this sub-level accounts for any remaining flat fish species that fit the general criteria of frozen fillets for further processing but are not explicitly listed.