Sharksonline's Blog

Blue shark

Posted on: March 11, 2010

Above the Blue shark

1. The blue shark is found worldwide in deep temperate and tropical waters from the surface to about 350 meters. In temperate sea it may come closer to shore where it can be seen by divers but while in tropical waters it occurs at greater depths. It is found from as far north as Norway to as far south as Chile. Blue sharks are found off the coasts of every continent but except for Antarctica. It prefers waters with a temperature range of 7 to 16°C but will tolerate temperatures of 21°C or above.

2. Blue sharks are light-bodied with long pectoral fins. The top of the body is deep blue and lighter on the sides and the underside is white. A blue shark grows to 3.8 m (12.5 ft) long. The shark’s typical weight is 136 kg (300 lb) to 182 kg (400 lb) and can grow to 205 kg (450 lb). The highest reported weight was 391 kg (861 lb). They are rarely mistake with other sharks.

3. The blue sharks has a diet of squid, cuttlefish and pelagic octopuses, as well as lobster, shrimp, crab and a large number of bony fishes, small sharks, mammalian carrion and occasional sea birds. Whale and porpoise blubber and meat have been retrieved from the stomachs of captured specimens and they are known to take cod from trawl nets. Apparently blue sharks do not or only very rarely, eat tuna.

4. The female blue shark have 4 to 135 pups per litter. The gestation period is between 9 and 12 months. Females mature at 5 to 6 years of age and males at 4 to 5. It is believed mating involve biting by the male. Female blue sharks have skin 3 times as thick as that of males so the biting does not leave them bleeding.

5. Blue sharks are the most heavily fished sharks in the world mainly as result of by-catch. It is estimated that 10 to 20 million individuals are killed each year as a result of fishing. The sharks skin is used for leather, the fins for shark-fin soup and the liver for oil. Blue sharks are occasionally catch for game fish and they are frequent accidental catches by commercial fisherman seeking swordfish or tuna. Blue sharks are not considered dangerous and rarely have been known to attack humans. Most attacks between blue sharks and humans take place in deep water and on small boats as they rarely come close to shore. As of 2008, there has only been 3 encounters with humans and one fatal.

All of this info is from


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