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Swordfish have a much wider temperature range, where marlin are more tropical and subtropical in habitat. Another major difference is the dorsal fin on a swordfish is rigid, fixed in the upright position. Whereas all marlins and sailfish have a dorsal fin that can fold down into a channel.Marlins are generally larger than swordfish as well. Swordfish is eaten by humans whereas marlins are generally not.he bill on a swordfish looks just like a sword. A marlin bill is more rounded, not as long, and has a rough, raspy surface that the swordfish does not. They are all large open water predators however, swordfish are primarily nocturnal whereas marlin are diurnal.
Sailfish grow quickly, reaching 1.2â1.5 m (3 ft 11 inâ4 ft 11 in) in length in a single year, and feed on the surface or at middle depths on smaller pelagic forage fish and squid.ailfish are highly prized game fish, and are known for their incredible jumps and great speed. They can swim 100 m in 4.8 sec. They can appear in a startling array of colours, from subdued browns and grays to vibrant purples and even silver.