Sailfish

Genus of fishes

The sailfish is one or two species of marine fish in the genus Istiophorus, which belong to the family Istiophoridae (marlins). They are predominantly blue to gray in color and have a characteristically large dorsal fin known as the sail, which often stretches the entire length of the back. Another notable characteristic is the elongated rostrum (bill) consistent with that of other marlins and the swordfish, which together constitute what are known as billfish in sport fishing circles.

From Wikipedia, under CC BY-SA. More on occurri.