It is well-known that black marlin have fixed pectoral fins that don’t retract and lie flat like the blue’s, but they also have shorter, thicker bills and a dorsal fin that is less than half the size ...

Unlike black marlin, a blue marlin’s pectoral fins are never completely rigid. Except in the largest fish, the pectoral fins can fold flat against the sides. Blues also have a tall, pointed dorsal fin ...

Sailfish are a little less noticeable because if the dorsal fin does surface, you’re likely only going to see a small black triangle. On the other hand, a marlin’s dorsal fin is much stiffer, so it’s ...

At that moment a marlin dorsal fin appeared 50 yards out on our right. A large fish. A contender. Bobby made the boat do a heart-stopping 180. Still, the big blue refused all our lures.

Black marlin: The black is the easiest to pick, whether it’s a small 30kg fish or a 500kg monster. The dorsal fin is fairly short and rounded and the colouring after death is dull and drab.

The longer the fight, especially for blue marlin, the longer the recovery period ... swims away with a tag attached below its dorsal fin. The tag tracks data, including swimming depth, tail ...

Blue marlin are sexually dimorphic ... "We also look at her morphology. She has a dorsal fin that comes up and allows her to turn right and left in the water column when she gives that one ...

It has low, round dorsal fins, and rigid, non-retractable pectoral fins that aid in its speed. There is some debate about the ...

Most Atlantic blue marlin encountered by fishermen are large and ferocious, highly prized for their strength and acrobatics at the end of a line. They can reach weights of nearly 1,500 pounds and ...

But neither of us was disappointed. The “dorsal fin” turned out to be the narrow, swept-back tail-fin of a white marlin — the first I had ever seen off Massachusetts waters. Had I been a ...