The Southern spearnose poacher (Agonopsis sterletus) is a fish in the family Agonidae (poachers). It was described by Charles Henry Gilbert in 1898, originally under the genus Averruncus. It is a marine, subtropical fish which is known from the eastern central Pacific Ocean, including California, USA to Baja California, Mexico. It dwells at a depth range of 42 to 91 metres (138 to 299 ft), and inhabits soft benthic sediments. Males can reach a maximum total length of 15 centimetres (5.9 in).