Importers must file a SIMP report at entry, providing harvest event data including vessel name, flag state, fishing area, gear type, and species identification. Alaska pollock is a SIMP-covered species, so chain-of-custody records from harvest through first point of landing must accompany the shipment.

The key classification factors are whether the fillets are skinned, whether they are packed in frozen blocks exceeding 4.5 kg each, and whether they are intended for mincing, grinding, or cutting into uniform pieces. If all three conditions are met, classification shifts to 0304751000; fillets that do not satisfy all three criteria fall under this general line (0304750000).