CBP may request species identification to confirm that the product belongs to one of the eight enumerated families and is not more specifically classifiable under a sibling line. Commercial invoices should state the scientific or common species name, and a certificate of origin or catch certificate from the foreign supplier can support classification. For high-value or high-volume shipments, a binding ruling from CBP provides the strongest protection.

Yes — frozen hake (family Merlucciidae) in non-fillet, non-minced forms not meeting the bulk-container threshold generally falls under 0304950000. Major hake-producing regions include South America (Argentina, Chile) and Southern Africa, though importers should verify current supplier eligibility and any applicable trade measures at time of entry.