Harttia tuna is a species of catfish in the family Loricariidae. It is native to South America, where it occurs in the upper Paru de Oeste River basin in Suriname. The species reaches 17.2 cm (6.8 inches) in standard length. It is known to be very morphologically similar to the related species Harttia fluminensis. Its specific name, tuna, is derived from the Tiriyó language and roughly translates to "river".[1]