0303.89.00.13 - Shad and sturgeon

This HTS classification covers frozen fish identified specifically as shad and sturgeon. These are distinct species falling under the broader category of "other fish" within frozen fish excluding fillets and other fish meat of heading 0304. Their inclusion here is based on their unique species identification rather than a general characteristic.

Unlike sibling categories that may cover smelts, cusk, Atka mackerel, or mullet, this specific subheading is exclusively for shad and sturgeon. The distinction lies in precise species identification, as other "other fish" subheadings at this level may encompass different species or broader groups based on their environment (e.g., fresh-water fish).

As a leaf node, this classification does not further subdivide shad and sturgeon. Therefore, the primary classification criterion is the accurate identification of the imported product as either shad or sturgeon, ensuring it is in frozen form and not processed into fillets or other fish meat.