Promethichthys prometheus, the Roudi escolar, is a species of snake mackerel native to the warm temperate and tropical waters of all the oceans where it occurs at depths of from 80 to 800 metres (260 to 2,620 ft) (mostly between 300 to 400 metres (980 to 1,310 ft)). This species grows to a length of 100 centimetres (39 in) SL though most do not exceed 40 centimetres (16 in) SL. It is important to local peoples as a food fish and is popular as a game fish though it has been reported to carry the ciguatera toxin. It is also utilized as bait. This species is the only known member of its genus.