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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.
The chestnut and silver lamprey are parasitic in their adult stage and feed on body fluids and blood of fish. They can leave a deep wound in the fish that they feed on but rarely kill the host fish as the sea lamprey does. The American brook and the northern brook lamprey are not parasitic on fish and do not feed in their adult life stage. The invasive sea lamprey is the largest of the lamprey in the Great Lakes and can attain a size of two feet. The two native parasitic chestnut and silver lamprey can reach a size of one foot. The two native non-parasitic American brook and northern brook lamprey reach a maximum size of about six inches.