opah

kiiltolahna 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''), http://books.google.com.au/books?id=j_jocSnXy0kC&pg=PA398&dq=%22+opah%E2%80%8E%22%7C%22+opah%E2%80%8Es%22&hl=en&sa=X&ei=T1HeUcfFHcilkQWmtIDACw&redir_esc=yv=onepage&q=%22%20opah%E2%80%8E%22%7C%22%20opah%E2%80%8Es%22&f=false 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.

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.

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.