0309.90.50.90 - Other

This HTS classification, 0309.90.50.90, encompasses flours, meals, and pellets derived from molluscs, intended for human consumption, that are preserved by freezing. This category serves as a residual classification for frozen mollusc preparations not specifically listed under more granular subheadings. The key characteristic is the origin from molluscs, such as clams, mussels, oysters, scallops, and squid, which have been processed into a powdered, granular, or pelletized form and then frozen.

Distinguishing this category from its sibling, 0309.90.50.30 (Conch), is crucial. While both fall under frozen mollusc preparations, the "Conch" subheading specifically isolates products derived from conch meat. Therefore, 0309.90.50.90 is used for any other frozen mollusc flour, meal, or pellet not originating from conch. For example, frozen scallop meal or frozen clam pellets would fall here, whereas frozen conch flour would be classified under the sibling category.

As this is a leaf node in the HTS structure, there are no further subcategories. Classification within this heading relies on accurately identifying the mollusc origin and confirming the product form (flour, meal, pellet) and preservation method (frozen) for human consumption. Customs officers will assess documentation and potentially conduct product examinations to ensure the correct classification is applied, differentiating it from other aquatic invertebrate products or non-mollusc origins.