Classified as 'not elsewhere specified or included,' this residual line captures fresh or chilled whole-fish imports of Thunnus-genus tunas that do not fit the six species-specific lines covering albacore, yellowfin, skipjack, bigeye, Atlantic/Pacific bluefin, and southern bluefin. In practice, it may apply to lesser-traded species such as longtail tuna (Thunnus tonggol) or blackfin tuna (Thunnus atlanticus). FDA admissibility requirements apply to all fresh fish imports, and accurate species identification is essential — both to ensure the product genuinely belongs in the NESOI line rather than a named species line, and to satisfy any applicable catch documentation requirements. Importers should document the scientific species name on the commercial invoice to support classification decisions.

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