Frozen Fish Fillets, Not Elsewhere Specified

CBP requires species-specific classification where a dedicated line exists. For example, mahi-mahi (dolphin fish) must be declared under 0304895055, Atlantic ocean perch under 0304895035, and orange roughy under 0304895050 — the general NESOI line 0304895091 applies only when no species-specific line covers the product. Importers should obtain species identification documentation from suppliers and consult a licensed customs broker to confirm the correct line.

Several lines — such as 0304891025 and 0304891090 — specifically cover skinned fillets packed in frozen blocks exceeding 4.5 kg, a format common in food-service and further-processing supply chains. Individual retail-pack fillets of the same species would classify under the corresponding non-block line. The block-versus-individual distinction is a presentation criterion that affects both classification and, potentially, duty treatment.