Though this is actually a type of dolphin, it shouldn't be confused with the dolphin that is a mammal. To avoid this misunderstanding, the Hawaiian name mahi mahi is becoming more widespread. Also called dolphinfish and dorado, mahi mahi is found in warm waters throughout the world. It's a moderately fat fish with firm, flavorful flesh. It ranges in weight from 3 to 45 pounds and can be purchased in steaks or fillets. Mahi mahi is best prepared simply, as in grilling or broiling. See also fish.