Genyatremus luteus, the Torroto grunt, is a species of grunt native to the Atlantic coast of South America from Colombia to Brazil. This species prefers brackish waters of estuaries with a mud or sand substrate down to about 40 m (130 ft), but has also been caught in marine waters. This species grows to 37 cm (15 in) in TL, though most do not exceed 25 cm (9.8 in). This species is of minor importance to local commercial fisheries. It is the only known member of its genus.