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<i>Tetrapturus albidus</i>. Also called a billfish or spearfish, "the dorsal fin is low or moderately developed, and the ventrals are represented only by spines. It inhabits American waters as far north as New England in summer, and is not seldom taken in fathoms deep. The spear-fish is related to the swordfish (though of another family), and has a similar beak or sword. It attains a length of six or eight feet. In the West Indies its Spanish name is <i>aguja</i>." &mdash;Whitney, 1889

White Marlin, a Sailfish

Tetrapturus albidus. Also called a billfish or spearfish, "the dorsal fin is low or moderately developed,…

A blue or gray fish with a distinctive sail&mdash;like dorsal fin.

Sailfish

A blue or gray fish with a distinctive sail—like dorsal fin.