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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.
Compared to its cousins, the sailfish is relatively abundant. It is found world-wide in tropical and temperate seas. Like the other billfish, commercial mortality is the major risk to the health of the species and it is considered a food fish over most of its range.That attitude is changing.he high dorsal fin, the sail, makes the sailfish the easiest of the billfish to identify. Well, the swordfish is also rather distinct but it is in an entirely different family than the Istiophoridae family which includes the marlins, spearfish, and sailfish.