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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.
One of the secrets of the sailfish's speed, along with that of these other fast predators, lies in its musculature. It has huge amounts of white muscle, great for acceleration but not stamina. This is then boosted along the flanks by blocks of red muscle which need more oxygen but are good for sustained fast swimming.ne of the secrets of the sailfish's speed, along with that of these other fast predators, lies in its musculature. It has huge amounts of white muscle, great for acceleration but not stamina. This is then boosted along the flanks by blocks of red muscle which need more oxygen but are good for sustained fast swimming.