The black snake mackerel (Nealotus tripes) is a species of snake mackerel found worldwide in both tropical and temperate waters where they are found at depths of from 914 to 1,646 metres (2,999 to 5,400 ft) making diel vertical migrations from mesopelagic depths to the surface at night. It can reach a length of 25 centimetres (9.8 in) SL though most do not exceed 15 centimetres (5.9 in) SL. It is important to local peoples as a food fish. This species is currently the only known member of its genus, Nealotus. That genus is therefore said to be monotypic.