Blue shark, Prionace glauca, easy to distinguish from other sharks in the blue staining. This family-owned Carcharhinidae, which means that it is the shark Requiem. When you watch the blue shark from above you will see a deep indigo blue color, while blue sharks observed from the addition appears bright blue. White belly and tip of pectoral and anal fins with black color. Body elongated and slender blue shark can usually reach the size of 3.8 meters (13 feet), but the longest blue shark ever found even greater than that measured 400 cm. Blue sharks are known heaviest weight was 205.9 kg. Very long pectoral fins Blue sharks are always equal in size to the length of gill current and nozzle tip shark. Snout long and has a conical shape. Lobe of caudal fin Blue shark is much larger than the lower, and the base of the tail has a weak keel. There is no ridge interdorsal. All blue sharks have large eyes covered by a membrane pengerjap.
Teeth on lower jaw and valve equipped with a small triangle or finely serrated edge. Serrated teeth for catching blue shark facilitate smooth animal, such as squid. Teeth are in rows, and new teeth into place smoothly play immediately after tooth long been tired, lost or damaged. Blue sharks will only use the first two rows of teeth when hunting, another line only to play into place when needed.
Blue sharks are one of the fastest swimming sharks, and can easily keep speed with most fish species. Body long, slender and fit to swim faster because the water is very small barriers. Large tail fins move side to side and provide more strength for blue shark. Swim by means of an elegant and powerful enough to make the jump from the water. Further research is needed to confirm the maximum speed of the Blue shark. Some scientists estimate the maximum speed to about 35 km / hour (22 miles per hour), while others claim that the maximum speed can be about 97 km / hour (60 miles an hour).
Blue sharks are found in most of the world, between 50 º and 50 º latitude LU S in offshore waters and coastal waters. This settled the Atlantic and Pacific Ocean and Indian Ocean and the waters of love is and tropical climates. It is believed to be chondrichthyian beruaya from the widest and far. A marked blue sharks off the coast of New Zealand and then found 1200 km off the coast of Chile. The Atlantic blue sharks follow the warm Gulf Stream, and emigrated across the Atlantic each year. Their journey starts in the Caribbean Sea and the results along the east coast and then to Europe. They then reverse direction and follow the line of the West African coast before they turn and swim back to the western Caribbean Sea.
In the western Atlantic blue sharks you can see from Newfoundland in Canada and down to Argentina. It is also found in the Middle Atlantic and from Norway to South Africa in the Eastern Atlantic. (The Mediterranean is included.) The Indo-West Pacific region spread from East Africa to Indonesia and Japan. It is often seen throughout Australia, New Zealand and New Caledonia. In the Eastern Pacific Blue sharks inhabit the vast territory between the Gulf of Alaska and Chile.
Blue sharks are primarily marine, but also commonly found in near coastal waters, especially in the continent are narrow ramps. Blue shark in temperate areas will always stay close to the surface in the pelagic. In the warm tropical waters of the deep dive deeper, because the preferred water temperature between 7 º and 16 º C, which are usually found further down. Depth range is known for blue shark is 0-350 meters, and generally found to 150 m. Blue shark will often form large schools. These schools are often composed of men only or women only, and all the blue shark is the same size. We still do not know why they do this, but maybe a way to prevent the attack from larger predators.
A blue shark feeds primarily on squid and bony fish. Pelagic fish usually form the basis of the Blue shark diet, such as sword fish, tuna, mackerel, cod, herring and sea raven. Seals, flatfish, pelagic red crabs and dead Cetacea is also part of a normal diet. Blue sharks often will attack the fish has been caught by long line or the same capture device, which unfortunately means that Blue sharks are often caught in the equipment itself. Blue sharks are also known to occasionally eat seabirds and garbage.
Blue shark is believed to be one of the most breeding species of large sharks, but the minimum population doubling time is more than 14 years. Method of reproduction is vivipar, which means that the eggs develop into the dog in the female blue shark and receive nutrition in her body. After mating the female Blue Shark can store sperm for several months, sometimes even years. Sperm covered in his oviducal gland where they will be provided with nutrients to stay alive. When finally he berovulasi, fertilization took place, and live Blue shark pup born after pregnancies of 9 to 12 months old. Blue sharks are one litter of puppies usually contain 25-50, but the stretcher area 135 have been reported. The bigger the blue shark women, children more dogs in each litter. Blue sharks are very small can have a litter with no more than 4 cats. Blue shark A newborn puppy is between 40 and 51 cm (16 and 20 inches) long. A blue shark adult female will not become sexually until it has grown to be at least 2.2 to 3.2 meters (7-11 feet), while the male blue sharks are usually due when it is between 1.8 and 2.8 meters (6 and 9 feet). Blue sharks maximum age exceeding 20 years.
Blue sharks always have to be handled with caution as there were reported attacks on humans. Blue sharks are hunted and sold as food. Meat is sold fresh or preserved, and the most popular fin soup. Hiding from the Sharks Blue was used for the skin. Blue sharks are classified as lower risk / near threatened extinct.