The blue shark (blue shark, a large blue shark) is a marine inhabitant, which belongs to the detachment of carharinlike and the family of pilot sharks. Today this species is listed in the Red Book MSOP.
Appearance
The back of the blue shark is painted in indigo, the sides of the individual are bright blue. The belly is usually grayish. This color is camouflage in nature: the tributary residents simply do not notice the blue sharks, because they mix with sunlight.
The body of the shark is elongated, this predator has large breast fins, conical faces and large eyes. On each side is about 5 pairs of gills. Female individuals are usually more males. The length of the body varies from 2 to 3 meters. The female weighs 93-182 kg, and the male is about 50 kg. Maximum registered weight 390 kg.
The teeth of the blue shark are very sharp, the upper murder tools have a triangular shape and are concaves inside. The teeth located on the lower jaw, awl. There are furrows on the muzzle of this marine inhabitant that help to capture smells better. Therefore, blue sharks are able to smell a drop of blood in a few tens of km. The nostrils of the shark have a groove and there are special folds nasal valves. Eyes protects the third eyelid.
The breast fins have a sickle shape. The front dorsal fin is much more massive than the second. The blue shark has a long and flattened tail stem on the sides.
The scales of the skin of this inhabitant of the seas are small, they fit tightly to each other. Therefore, the skin of the shark is soft and smooth.
Where it lives
The blue shark lives in moderate and tropical water spaces. It is often found in the waters of Norway, Denmark. Shark is the inhabitant of the Adriatic and Aegean Sea, and lives in the waters of the Ionian Sea. The predator lives at a depth of about 350 m. The most pleasant temperature for the shark is 7-16 ° C. However, it can be in places with a temperature of about 21 degrees.
This shark often migrates. Young animals and mature males often winter near Gulf Stream, but most males prefer to do this off the coast of South America. Females living in England float about 700 miles.
Behavior
The blue shark prefers to lead a single lifestyle. Predators form flocks very rarely, moreover, such groups consist of samesex sharks. The weight of the individuals is also almost the same. Females interact with males only in the marriage period.
These marine inhabitants often migrate in the jackets of other fish. They can swim thousands of kilometers. The shelf is almost impossible to notice sharks.
Senses
The blue sharks have welldeveloped vision and smell. They can feel the slightest fluctuations in water. On the bottom of the muzzle, they have Lorencini ampoules that respond to changes in the electric field.
Natural enemies
The main opponents of the blue sharks are white sharks. Sea elephants often attack young. Many blue sharks parasitize oarly crustaceans. They live on the skin of sea predators.
White shark enemy of blue sharks
Diet
Blue sharks carnivorous sea inhabitants. They hunt mollusks and fish. The basis of the diet is threeoctopuses with Pelagic octopuses, Kalmara Kranchais. Sharks are distinguished from fish. Individuals living in the waters washing Brazil prefer infuriates. Love blue sharks and tuna, mackerel. Many sharks “pursue” fishing vessels and eat the remnants of food thrown overboard. Blue sharks can eat carrion, especially whales.
Reproduction
Females reach puberty in 5 or 6 years old, and males-only by 4-5 years. Cavaliers are unusually showing sympathy, biting females. Future mothers have a rather thick skin, because there are no traces left. Males most often bit their backs, namely the place between the first and second fins.
Individuals mate near the continental shelf. The male and the female do not contact after that. Sharks mate with several individuals.
Spermatozoa can remain in the body of the future mother for a very long time: from a month to several years. This continues until ovulation occurs.
Pregnancy can last 9-12 months. Females give birth in rather cold waters. From 25 to 50 sharks may be born. The length of the newborn about 30 cm. These sea predators are fully formed at the time of reach. The cubs remain in the subarctic water spaces until puberty reaches, and then migrate into tropical waters.
Danger
These sharks are very dangerous for people. They most often attack divers and fishermen going into the open sea or ocean. Cases of people hunting are frequent that were saved during the shipwreck.
However, people are also dangerous for sharks. Due to the delicate meat, which is devoid of ammonia smell, they often hunt sharks. This craft is most popular in the USA.
Hunting
Usually sharks swim slowly, without making sudden movements. However, you just have to catch a good moment for the attack, the shark breaks and floats at a speed of 40 km per hour.
Shark fishing rules
Today you can catch blue sharks. This is usually done with a rod. To attract the attention of sharks, use mackerel. Often you can only catch small sharks 1-1.5 m long. If you came across a shark whose weight is less than 45 kg, it must be released.
