Distinctive Characters: A slender shark with long snout and long pointed pectorals. No spiracles. Base of first dorsal closer to pelvic than pectoral origins. Weak keel on either sides of caudal peduncle.
Colour: Deep blue above, pale below.
Habitat and Biology: Oceanic, epipelagic, from the surface to at least 220 m depth. It prefers relatively cool water at 70 C to 160C, but can tolerate warmer waters. Feeds on bony fishes, small sharks, squids, pelagic crustaceans and occasionally sea birds and carrion. Viviparous, with a yolk-sac placenta; number of young 4 to 135 per litter.
Distribution: Circumglobal in temperate and tropical waters.
Remarks: Prionace glauca is probably the widest ranging chondrichthyian, but it is not very common in the Maldives. It is known to undertake long distance migration and show some degree of sexual segregation. About 95 per cent of blue sharks in Maldivian waters are males. A dangerous shark with several attacks on people and boats on record.