HTS code 1604.14.22 covers "Prepared or preserved fish; caviar and caviar substitutes prepared from fish eggs › Tunas, skipjack tuna and bonito (Sarda spp.) › In oil › In containers weighing with their contents not over 7 kg each, and not the product of any insular possession of the United States, for an aggregate quantity entered in any calendar year not to exceed 4.8 percent of apparent United States consumption of tuna in airtight containers during the immediately preceding year, as reported by the National Marine Fisheries Service" under the US Harmonized Tariff Schedule. This is the official duty rate charged by US Customs when this product is imported into the United States, sourced directly from the U.S. International Trade Commission and refreshed daily.