Hoplostethus gigas, the giant sawbelly, is a medium-sized deep-sea fish species belonging to the slimehead family (Trachichthyidae). It is found along the western and southern coasts of Australia and near New Zealand. It lives on the continental slope between depths of 237mand311mm (778feetand1,020feetm). It can reach sizes of up to 52.5cm (20.7inches) SL.