Blue sharks are considered to be dangerous and are thought to be responsible for attacks on ship and air disaster victims.

Statistics
The largest recorded blue shark was 3.83m, but females average 2.76m and males 2.46m.

Physical description
This species has a bright blue body, with a white underside. It has a pointed snout with long pectoral fins (on the side of the body) and a streamlined body. Blue sharks have triangular, serrated teeth and large eyes.

Distribution
Blue sharks inhabit deep water in tropical, subtropical, and temperate seas worldwide.

Diet
They are voracious predators, feeding on schools of fish including anchovies, sardines, herring, and squid.

Behaviour
Blue sharks are a nomadic species and can travel hundreds of miles each year. They often gather in large groups. They are considered to be one of the fastest fish.

Reproduction
Females give birth to 25-50 pups, (although once, a litter of 135 individuals was recorded) after a gestation period lasting 9-12 months.

Conservation status
Blue sharks are classified as Lower Risk by the 2000 IUCN Red List.