Sailfish (70 mph, 112 kph)
Sailfish have a characteristic erectile dorsal fin known as a sail, which often stretches the entire length of the back. The sail is normally kept folded down and to the side when swimming, but it may be raised when a sailfish feels threatened or excited, making the fish appear much larger than it actually is. A highly prized game fish, sailfish are known for their incredible jumps. Although predominately blue or gray, sailfish can appear in a startling array of colors, from subdued browns to vibrant purples and even silver.