This line is a catch-all for fresh or chilled fillets from the listed families (Bregmacerotidae, Euclichthyidae, Gadidae, Macrouridae, Melanonidae, and others) that are not specifically named in a preceding subheading. If the species is explicitly enumerated — such as hake under 0304440030 — it must be classified there. Only species within the covered families that lack a dedicated line fall here.

Importers should obtain a species identification certificate or commercial invoice that states the scientific name or family of the fish. Customs brokers may request a catch certificate or processor's declaration confirming the taxonomic family, particularly for less common species like grenadiers or morids, to support the NESOI classification and avoid reclassification risk.