Pacific Blue Marlin

Other Names: Aguja Azul

Physical Description:

The Atlantic and Pacific specimens are nearly identical in appearance. The back and upper portions of the body are dark, cobalt blue in color, including the first dorsal fin. The lower portion has a silver-white color.

In many cases, there are up to 15 vertical stripes, consisting of small dots and narrow bars, with a light cobalt blue color. These stripes become quite bright when the fish is ready to strike or when hooked, but they rapidly disappear when the fish is removed from the water. The remaining blue marlin fins are generally black-brown in color and the anal fins have a bit of silver-white tinge.

The principal way to distinguish blue marlin from their relatives is to examine the shape of the dorsal fin tip, which is more pointed on blue marlin. In addition, the spots found on the fins of most marlin are absent on the blue marlin.


Papagayo Fishing – Charters and Beaches

Guanacaste Marlin Fishing
Marlin Fishing in the Papagayo Gulf
Marlin Fishin in the Gulf of Papagayo

Blue marlin can be found in tropical and warm temperate waters around the globe, mostly in the Atlantic, Pacific and Indian Oceans. It is the most tropical of the billfish and is often found in waters near the equator. In eastern Pacific waters, they can be found in an area generally from southern California along the coast of Mexico to Peru in South America.

Feeding Habits:
Blue marlin feed primarily near the surface, though they occasionally dive to deeper water to feed, depending on where their prey is found. Their diet consists mostly of fish and other sea life found near the surface and is highly dependent upon location. This diet can include tuna, mackerel, squid, octopus and any number of fish species indigenous to the environment.

Sporting Qualities:
Most believe Blue Marlin is the most sought after of all the ocean sport fish. A super strong and powerful bill-fish, blue marlin will fight hard and run fast for many hours on end, especially when you are hooked up to a very large marlin. They can suddenly dive to deep water and can make wild jumps like some type of fish acrobatic. With impressive endurance, it is not uncommon to see a hooked fish make up to 40 or more spectacular jumps. This fish can be a tough test of anglers deep sea fishing skills.

Very little is known about the biology of the blue marlin including their migrations and spawning habits. They are known to be a highly mobile species that travels the warm ocean currents with the seasons in search of comfortable water temperatures.

This species inhabits depths up to about 600 feet and water temperatures between 70 and 86 F. They are primarily an offshore species found along the edges of continental shelves, near oceanic mountains, underwater canyons, especially near a warm ocean current. Within these environments, they are most likely to be found near large sources of tuna, mackerel, and squid. Although they may occasionally form schools of up to 10 members, as they age they become more solitary in their habits.