No. Mixed species shipments must be classified by the predominant species by value or weight, or split into separate entries if the species are clearly segregated. CBP expects species-level accuracy, and FDA's seafood traceability requirements independently mandate species identification on import documentation. Commingling haddock and cod without proper species segregation can trigger both customs and FDA enforcement action.

Filleting moves the product to HS 0304 (frozen fish fillets). Smoking, salting, or drying haddock — even if it remains frozen — would reclassify it under Chapter 3's preserved-fish provisions or, if further processed, potentially into Chapter 16. The key classification boundary is whether the fish has been filleted or subjected to a preservation process beyond simple freezing.