Mahimahi are known as dolphinfish in much of the world.  It is an important food in all tropical seas.  The way to tell a female and a male mahimahi apart is the male has a squarish head and the female has a more rounded head.  They migrate to temperate seas in the warmest months of the year.  They eat flying fishes, and they have the ability to swim at speed as high as 50 miles per hour.  They are abundant from February to April and often caught when the water is rough.  Mahimahi lay eggs in mid-summer.  Each female lays up to a hundred thousand eggs.  They can live up to five years, but are rarely alive up to three years.  Their length can reach up to five feet nine inches and weigh 87 pounds.  The largest mahimahi caught near Guam was 52 pounds.