Female blue sharks have adapted to the rigorous mating ritual by developing skin three times as thick as male skin.
They reach up to 4 meters in length (13 feet) and weight up to 205 kilograms (450 pounds)
These sharks are migrants and love the deeper waters all over the world, except for the Polar Circle. They enjoy depths of around 400 meters (1,312 feet). Their desired temperature is 10 to 20 degrees Celsius (50 to 68 degrees Fahrenheit).
The species prefers to eat squid. But they will consume much more than that, including bony fish, smaller sharks, sea birds, shrimp, and lobster.
This is the most fished shark of all shark species. They are used for their fins, shark skin, tails, and flesh. Sometimes their teeth and jaws are taken for commercial uses as well. There has been much concern recently about over fishing from both commercial fisheries as well as game fisheries. Approximately 10 to 20 million of these sharks are killed due to human capture every year.
This species has no other natural enemies besides Humans.This species is non aggressive towards humans. The only known attacks are the result of the shark feeling threatened or biting after a human capture of the shark.