Opah (also known colloquially as moonfish, sunfish, kingfish, and Jerusalem haddock) are large, colourful, deep-bodied pelagic Lampriform fish comprising the small family Lampridae (also spelled Lamprididae). There are only two known species in a single genus: Lampris (from the Greek lamprid-, "brilliant" or "clear"). One species is found in tropical to temperate waters of most oceans, while the other is limited to a circumglobal distribution in the Southern Ocean, with the 34th parallel as its northern limit.