"Mahi-Mahi is a beautiful fish with a rainbow of dazzling iridescent colors which fade after dying. The back is electric green and blue with gold or silver sides and bellies. The sides have a speckling of spots.
They are among the fastest swimmers in the sea, and their Spanish name is Dorado maverikos which means “golden maverick”. The average commercial size is about 5 lbs, but mahi-mahi can reach up to 50 lbs."
Source: Chef’s Resource