The blue shark is an oceanic species, although sometimes it can be found near the coast. Latin name Prionace glauca.
In sharks of this species, the body is slender and thin, painted in the upper part in a dark blue color, and in the lower part - in white. It lives in all oceans, but prefers subtropical and moderately warm waters than tropical ones. The optimum water temperature for the blue shark is 10-15 °, so in the tropical zone it tries to stay at a depth.
It is assumed that the largest length of the blue shark is 3.8 m, but there is eyewitness accounts of the capture of representatives of this species, reaching a length of 6 meters.Blue Shark (Prionace glauca).
This shark is not very mobile, however, upon seeing food, it immediately transforms. Her diet includes fish and cephalopods. She does not disdain any other prey that occurs on her way. It happens that a blue shark swims for a long time next to the ships, eating ship waste. This is a viviparous fish. The number of embryos can be from 4 to 54 pieces. But most of them die soon after birth. Newborn sharks are about 30 cm long.
Once there was a funny incident. Off the coast of Western Australia, the crew of the Vityaz vessel caught a mature female blue shark. As soon as she was lifted aboard and hung on a hook, she gave birth to 52 sharks, who were quite viable and ready to live independently. Some of them were placed in aquariums, where they felt great.The blue shark is also called: blue shark, wet.
Sharks of this species are the most famous and famous and are listed in the Red Book. Near the coast, blue sharks appear extremely rarely, preferring to live in the open ocean. Another name for the blue shark is the whale shark. It appeared due to the fact that these sharks like to be near whalers. In those days when whales were actively caught, these sharks literally circled around whaling vessels, expecting whalers to throw edible pieces overboard. And in those days, when the carcasses of whales were carved right in the water, these predators, not afraid of whaling knives, attacked the carcass of a whale. And even if they themselves were stabbed, this did not stop them from continuing to tear off pieces of meat from the whale.
The blue shark is not as dangerous to humans as many people think. There are practically no cases of her attack on people. But on the human side, this shark is in real danger, since recently it has been exterminated on a large scale. To preserve this species, it was decided to release those individuals that did not reach a weight of 40 kg when caught. Blue sharks are much less common than white sharks.Blue sharks do not prey on humans.
Sharks of this species prefer calm seas, which is why they have chosen for themselves the north of the Adriatic Sea, the southern part of the Ionian Sea, as well as the Aegean Sea.
It is in the Adriatic, to be precise, in the waters between Rimini and Punta del la Maestra there is a favorite breeding ground for blue sharks. Pregnant females and young sharks that prey on young fish are often found in these waters. Newborn sharks prefer to eat tuna, mackerel and other fish species.
Between May and November, almost 70% of all blue sharks, which after this period go to the Adriatic Sea, gather in the Pescara area and the mouth of the Po River. This is the opinion of employees of the Milan Municipal Aquarium.Blue sharks are on the verge of extinction.
As already mentioned, these are rather slow creatures, but they are able, if necessary, to overcome significant distances in a relatively short time period. Some blue sharks gather in small flocks. According to some, these are very aggressive fish that attack everything that comes in their way. According to others, this is an extremely lazy fish, attacking only those who are not dangerous and even slower than they, for example, squid or sepia.Blue sharks do not distinguish colors at all.
Blue sharks do not distinguish colors, for them the whole world is black and white. But they perfectly recognize contrasts, and also perfectly navigate in water. Sharks of this species can easily recognize light objects against a dark background and vice versa.
Blue shark along with herring shark make up a couple of the most common shark species in the world. The blue shark owes its name to its color, which was described above: a dark blue back and blue sides. It is noteworthy that the blue sharks recovered from the water very soon turn gray.
Blue shark hunting is risky and dangerous. An inexperienced fisherman may not be able to cope with it.Hunting for the blue shark is an activity only for experienced and brave fishermen.
The blue shark, like other types of sharks, has a spiracle or sprinkler directly behind the eye, connected to the respiratory system. Like most sharks, the blue shark does not have a swimming bladder. It compensates for its absence by changing the volume of water inside itself, as well as by the fact that it is constantly in motion.
This shark can be called a nomad who lives either in depth or in shallow water. But what always unites the places of her stay is the presence of accumulations of small fish. In the warm season, blue sharks swim close enough to the shore, because at this time you can find a lot of food suitable for these predators.
As already mentioned, a blue shark does not attack a person, but it is still considered one of the most dangerous sharks.