The tariff line requires that the blocks be imported with the intent to be minced, ground, or cut into pieces of uniform weight and dimensions. Importers should retain purchase orders, processing agreements, or other commercial records demonstrating this downstream use, as CBP may request evidence that the block format is not simply a packaging choice for retail distribution.

Atlantic ocean perch (rosefish, Sebastes marinus) is a specific species native to the North Atlantic. The US schedule separates it from non-Atlantic ocean perch species, which fall under different lines. Species identification — typically via scientific name on the commercial invoice or a supplier's species certificate — is the key document for confirming correct classification under 0304891025.