Danube salmon — scientifically Hucho hucho and known in the trade as huchen — occupies a narrow niche at HTS 0302140062 as a freshwater salmonid native to the Danube River basin of Central and Eastern Europe. Unlike the commercially dominant Pacific and Atlantic salmon lines, huchen is rarely traded in volume; it is a protected species in several range countries, and importers should verify that any shipment complies with applicable national export restrictions and, where relevant, CITES documentation requirements. FDA seafood HACCP rules apply to all fish entries regardless of volume. The NESOI designation signals that this line captures huchen not covered by more specific provisions within the Salmo/Hucho subheading.

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