Doubled, a Hawaiian food fish

• Half a seafood entree?
• Half a Hawaiian fish
• When repeated, a dolphinfish
• Polynesian food fish, for short
• Repeated, a popular grilled fish
• When repeated, a fish used in tacos
• Half portion at a luau?
• Hawaiian fish, for short

Wikipedia Word definitions in Wikipedia
Mahi is a name of multiple origins, found in various countries.