The blue shark is one of the most abundant and far-ranging of all sharks. It is also a prolific breeder. Females sometimes litter as many as 135 pups.

This is a slimly built fish: a 2 m (6.5 ft.) specimen would weigh only about 32 kg (70 lb.).

The blue shark is sometimes known as the blue whaler because of its frequent presence at the scene of a whale kill. It occasionally attacks humans.

Blue sharks are found in all the tropical and temperate ocean waters of the world.