Definition of "opah"

A member of the lower epipelagic community, the opah feeds on squid and fishes (including some benthic species) and is usually found well offshore.

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

For a long time, opah has been thought to be good luck so it was only given away, never sold. Opah is a nonschooling open-ocean fish so it's not caught in great quantities.

2006, Sharon Hamblin, Adventure Guide Maui, page 36

Opah is an extraordinary-looking ocean fish, with an almost perfectly round shape; a comparatively thin, flat profile; a silvery skin, and bright crimson fins.

2013, Roy Yamaguchi, John Harrisson, Roy's Fish and Seafood: Recipes from the Pacific Rim, page 77