Arripis trutta, known as kahawai in New Zealand and as the Australian salmon in Australia, is a South Pacific marine fish and one of the four extant species within the genus Arripis, native to the cooler waters around the southeastern Australian coasts and the New Zealand coastline. Other common names for this species include Eastern Australian salmon, bay trout, blackback salmon (or just "black back"), buck salmon (or "buck"), cocky salmon, colonial salmon, newfish and salmon trout.

Although it is referred to as "salmon" in Australian English and its species epithet trutta is Latin for trout, it is not related to true salmons or trouts, which belong to the family Salmonidae of the order Salmoniformes. All Arripis species belong to the family Arripidae of the order Perciformes.