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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.
They are known for their easily identifiable sword like protrusion from their faces, which is used to slice at prey and make them easier to catch. They are the only member of the Xiphiidae family-although they do seem superficially similar to fish such as Marlin, sailfish they are in fact a different species.The difference between marlin, other billfish and Swordfish is the shape and texture of their bill.hey are a commercially sought 'food fish' all over the world; the USA, Canada, Portugal, Brazil, Japan, Spain, Taiwan, and Uruguay all indulge in Sword fishing. Harpoons or fishing rods are prevalent tools used to catch sword fish as they are adept at using their 'swords' to cut through nets when trapped.