Atlantic pollock (Pollachius virens) classifies under HS 030365 / 0303650000, while Alaska pollock (Gadus chalcogrammus, formerly Theragra chalcogramma) has its own dedicated heading elsewhere in Chapter 3. The two species are unrelated at the genus level despite sharing the common name 'pollock,' and they command very different market prices and trade volumes. Species-level documentation — such as a catch certificate or species declaration — is required to support the correct classification.

The HS nomenclature uses 'coalfish' as the international heading name, reflecting European trade terminology for Pollachius virens. The US 10-digit line (0303650000) adopts the more familiar North American trade name 'Atlantic pollock' in its description. Both terms refer to the same species; importers should ensure their commercial invoices and species declarations use the scientific name Pollachius virens to avoid any ambiguity at entry.