Any of various large, colourful, deep-bodied pelagic fish of the family Lamprididae.
2003, Margaret M. Smith, Phillip C. Heemstra (editors), Smiths' Sea Fishes (Revision of 1977, James Leonard Brierley Smith, The Sea Fishes of Southern Africa), page 398,
A member of the lower epipelagic community, the opah feeds on squid and fishes (including some benthic species) and is usually found well offshore.