Hypostomus luteus, also known in the pet trade as the golden sailfin pleco, is an armored catfish in the genus Hypostomus of the family Loricariidae. The species experiences a notable three–phase shift in its coloration as it ages. It grows to a maximum size of 45 cm (18 in).

It is found in Northern Argentina in Rio Uruguay. It lives in fast-flowing waters where it mostly feeds on algae.

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