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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.
Nocturnal animals are awake and active at night and then sleep during the day. Some nocturnal animals can be seen during the day, but most of them spend their whole day resting. Examples of nocturnal animals include bats, skunks, aardvarks, and owls. Nocturnal animals sleep during the day for various reasons. Most nocturnal animals sleep during the day and are active at night in order to avoid predators that are active during the day. For example, sea turtles go to their breeding sites in order to keep themselves safe and protect their offspring. Most nocturnal animals live in the desert.