The blue shark (Prionace glauca) is a species of requiem shark. It has a slim, smooth-looking body with large eyes, and a long, cone-shaped snout. The dorsal surface is a dark blue colour, and the belly is white.
The largest blue sharks can reach lengths of up to 3.8 metres, and weigh as much as 206 kg. The shark is found worldwide in temperate and tropical waters. They range from the surface to as deep as 350 metres, and prefer water with the temperature of 7 to 16 °C.
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