Where is the blue shark found? The blue shark is a dangerous beauty. Blue shark. Myths and reality about the blue shark from Petr de Cril’on
The blue shark is one of the most common species of selachy. The predatory fish lives throughout the world's oceans in tropical and temperate waters. It can be found off the coast of Scandinavia and off Cape Horn. It prefers depths of up to 350 meters, so it often appears in coastal waters. The most favorable water temperature for it lies in the range from 7 to 16 degrees Celsius. But it can withstand more high temperatures up to 21-23 degrees Celsius. Fish tend to migrate within the main ocean currents. Does not live in cold waters. Therefore, in the Arctic and Southern Oceans she's not there.
This fish has very long pectoral fins. The caudal fin is asymmetrical. The upper lobe is much larger than the lower. Females are larger than males. The maximum body length reaches 3.5 meters with a weight of 230 kg. The usual length of a male reaches 2.8 meters, for a female up to 3.3 meters. Weight ranges from 120 to 180 kg. Sharks weighing more than 200 kg are very rarely found. The body of the fish is elegant and perfectly streamlined. The skin is blue on top, light blue on the sides, and the belly has White color. Speed performance is not very impressive. The maximum a shark can do is reach a speed of about 40 km/h.
Reproduction
This species is viviparous. Puberty occurs when the body length is from 1.8 to 2 meters. Pregnancy lasts 12 months. Usually 80-120 fry are born, depending on the size of the female. The baby sharks start right away independent life. Half the brood is eaten large fish, the second half grows to adult size. The blue shark has a high survival rate, so it has a very large population.
Behavior and nutrition
It must be said right away that this type poses a great danger to humans. In 2010, there were 29 attacks on people around the world. Of these, 7 were fatal. Fortunately, humans are not the main food source for this species. The predator loves octopuses, shrimp, crabs, and lobsters. Eats in large quantities fish. Mostly cod. Attacks dolphins, smaller sharks and seabirds. Does not disdain carrion. That is, it eats any animal food that gets in its way. But it has been noticed that for some reason many representatives of the species do not like tuna and eat it only when absolutely necessary.
Enemies
While the blue shark is at a young age, it has a lot of enemies. But the predator grows, matures, and the threat to life from other ocean inhabitants decreases. Only killer whales are beginning to pose a danger. Other types big sharks They differ slightly in size, so they are not considered serious enemies.
The greatest damage predatory fish a person applies. The liver is of primary interest to him. She has an idea for production medical supplies. The fins from which they are prepared are also valued. delicious soups. Fish meat is not very popular, but is also used in production. It is processed and prepared fishmeal. Therefore, catching of this species is organized on a large scale. Millions of sharks are caught every year. But the population size is still at an acceptable level.
In captivity, this fish lives very little. Usually dies within a month. True, some predators live in aquariums for 5 or 6 months. But these are isolated cases. They die, as a rule, from various infections that are safe for people, but fatal for underwater inhabitants World ocean.
Class - Cartilaginous fishes / subclass - Elasmobranchs / Superorder - Sharks (Selach)
History of the study
It is worth telling about an incident that occurred during the expedition on the Vityaz. A mature female blue shark was caught off the coast of Western Australia. She was lifted onto the ship and hung on a hook. At that moment, she gave birth to 52 small sharks, which were completely ready for life. Some embryos placed in an aquarium felt quite normal in captivity.
Spreading
In the western Atlantic, the blue shark is found near Newfoundland, in the Gulf of St. Lawrence near Argentina. Blue sharks are also very frequent visitors to Canadian waters.
Appearance
The blue shark is one of the most commonly seen sharks. She has bright color, deep blue (almost indigo) color on top, light blue on the sides, white below. The large pectoral fins are clearly visible, occupying the distance between the tip of the snout and the last gill slits. The blue shark is a long, "skinny" shark, reaching a length of almost 4m. This is probably the most prolific of all large sharks, and is found in abundance in all seas.
Structural features
The blue shark has a weakly defined pig fin, the tail fin has a prominent top part. The teeth on both the lower and upper jaws are triangular in shape with smooth or sawtooth edges.
Reproduction
The blue shark is a viviparous species, carrying its young in the womb and then giving birth to them. Small sharks reach up to half a meter in length; one litter usually contains from 25 to 50 individuals. Females reach sexual maturity at a size of 2 to 3.5 m, males - from 1.9 to 2.8 m. After copulation, the female can store sperm for months or even years until she reaches ovulation. After fertilization of the eggs, pregnancy can last 9-12 months.
Lifestyle
In most cases, sharks choose the upper and middle layers of water. She swims slowly and lazily, but if necessary, she is capable of leaping quite long distances in a fairly short period of time.
It is also worth noting that some individuals gather in small flocks.
Nutrition
This shark's diet includes many types of fish and squid, and it sometimes eats shellfish. Although part of its diet consists of flounder, the blue shark feeds primarily on herring, hake, cod, haddock, pollock, mackerel and other fish. Blue sharks often attack fish caught on a hook during fishing, as a result of which they themselves end up in the hands of fishermen.
The habitat of blue sharks is tropical latitudes. It is also worth noting that it is not as widespread as the great white shark.
Blue sharks live in the northern Adriatic Sea and southern Ionian Sea, as well as in the Aegean Sea.
These seas have a calm current and shallow water, which has a beneficial effect on the life of this species of shark.
Number
The blue shark is one of the two most common species. The second type of shark, no less common on earth, is the herring shark.
Blue shark and man
Despite the fact that there are virtually no reliable cases of a blue shark attacking a person, it is still considered one of the most dangerous representatives of this species.
Blue shark (Prionace glauca) also belongs to the oceanic species, although it is sometimes found off the coast. It has a thin, slender body and is colored dark blue above and white below. This species is found in all oceans, but, in contrast to the whitetip shark, is more typical for subtropical and warm temperate waters than for the tropical zone. The blue shark is most often caught at a temperature of 10-15° and, accordingly, in the warmed waters of the tropics it does not stay near the surface, but at some depth.
The greatest length of the blue shark, apparently, does not exceed 3.8 m, although there are reports of the capture of individuals reaching 6 m. This usually relatively sedentary shark is completely transformed at the sight of food. It feeds on fish and cephalopods, as well as any other prey it can find. Sometimes a blue shark accompanies slow-swimming ships for a long time, eating ship waste. She is viviparous, and the number of embryos can vary greatly - from 4 to 54 pieces. The length of baby sharks at birth is about 30 cm.
In addition to the fact that the blue shark is one of the most famous and famous sharks in the world, it is also listed in the Red Book. Blue sharks very rarely swim to the coast; their main habitat is the ocean. The average size of an adult blue shark is no more than 2-3 meters, although there are also larger individuals whose length reaches 5, and sometimes even 6 meters. Sometimes this type of shark is called whale sharks, because very often, blue sharks live close to whalers.
Blue sharks eat waste and shellfish as food. Rumors about the danger of this shark to people are extremely exaggerated. She very rarely attacks humans. However, it is worth noting that the extermination of this species has reached high levels.
Sharks are viviparous creatures, so they give birth to live baby sharks. Despite the fact that the number of individuals born can be quite large, a significant part of them do not survive.
After the bulk of the blue sharks were exterminated, it was decided to release individuals weighing less than 40 kilograms.
The habitat of blue sharks is tropical latitudes. It is also worth noting that it is not as widespread as the great white shark.
Blue sharks live in the northern Adriatic Sea and southern Ionian Sea, as well as in the Aegean Sea.
These seas have a calm current and shallow water, which has a beneficial effect on the life of this species of shark.
In the Adriatic, between Punta del la Maestra and Rimini, there is one of the largest breeding areas for blue sharks. Here you can often find big number pregnant females and small sharks that feed on young fish. The main food for newborns is tuna, mackerel and some other types of fish.
According to the findings of the Milan Municipal Aquarium, from May to November, about seventy percent of all blue sharks are found near Pescara and the mouth of the Po River, which subsequently head towards the Adriatic Sea.
In most cases, sharks choose the upper and middle layers of water. She swims slowly and lazily, but if necessary, she is capable of leaping quite long distances in a fairly short period of time.
It is also worth noting that some individuals gather in small flocks.
There are different opinions, regarding the aggressiveness of blue sharks. Some believe that blue sharks are extremely ferocious and aggressive and are capable of attacking anything. However, other people, on the contrary, believe that the blue shark is a lazy fish that attacks exclusively slow and not dangerous creatures, such as squid or sepia.
Note also that the blue shark is not able to recognize colors, and sees all objects in black and white. However, instead of color vision, blue sharks have such qualities as recognition of contrasts and excellent orientation in water. Blue sharks are able to clearly distinguish dark objects against a light background and vice versa.
The blue shark is one of the two most common species. The second type of shark, no less common on earth, is the herring shark.
It is because of its light blue colored sides and dark blue back that this shark received the nickname “blue shark”. However, the caught blue shark soon turns gray. It is believed to be a dangerous and voracious predator.
The length of an adult blue shark is about 3.5-3.8 meters in length. There were cases when fishermen caught individuals weighing more than 90 kilograms. Blue sharks can grow to larger sizes, but only small and medium-sized individuals are caught, weighing about 20-30 kilograms. The process of hunting such a shark is a very dangerous and risky business.
Note that for an inexperienced fisherman, a competition with a blue shark can be an excellent test of one’s own strength. Just behind the blue shark's eye is a spiracle (squirter) that connects to the system that controls breathing. However, all types of sharks have a similar breathing system. In turn, the blue shark does not have a swim bladder. They regulate their buoyancy by changing the amount of water inside them and always being in motion.
The blue shark is a nomad by nature. She lives in places rocky shores, and at great depths. It can also be found in very small places. However, it is worth saying. That blue sharks can always be found in crowded areas small fish. In warm weather, blue sharks allow themselves to swim close to the shore, where there is a lot of food suitable for them.
The blue shark (Prionace glauca), although occasionally found offshore, is an oceanic shark. The blue shark has a slender and thin body. It is dark blue on top and white on the bottom. Blue sharks are more common in warm subtropical waters. Than in tropical zones. It is usually found in water with a temperature of about 10-15 degrees and most often swims at some depth rather than near the surface.
The length of the blue shark is usually no more than 3.8 meters, but there are individuals up to 6 meters long. In terms of its behavior, this species is characterized by low mobility, but when it sees food, its behavior completely changes. The main food for blue sharks is fish and cephalopods.
There are cases when blue sharks follow slow-swimming ships, feeding on waste that is thrown from the ships. This species of shark is viviparous. It is worth noting that the number of embryos can vary greatly. So, the number of sharks can be from 4 to 54 pieces. Newborn sharks are about 30 centimeters long. This species of shark breeds outside the tropical zone.
It is worth telling about an incident that occurred during the expedition on the Vityaz. A mature female blue shark was caught off the coast of Western Australia. She was lifted onto the ship and hung on a hook. At that moment, she gave birth to 52 small sharks, which were completely ready for life. Some embryos placed in an aquarium felt quite normal in captivity.
Despite the fact that there are virtually no reliable cases of a blue shark attacking a person, it is still considered one of the most dangerous representatives of this species.
At a time when active whale fishing was carried out, blue sharks did not hesitate to devour edible pieces that whalers threw overboard. And at a time when whales were butchered directly in the water, these predators tormented the whale carcass without fear of cutting knives. Even after the whalers inflicted serious wounds on them, they still continued to frantically tear off pieces from the whale’s carcass.
The blue shark, also called the mokoi and the great blue, lives in all oceans of our planet with the exception of the Arctic Ocean. At the same time, it is almost ubiquitous, since it can be found both in the open sea and not far from the coast. Scientists consider it a so-called pelagic fish, that is, one that is found in upper layers The world's oceans: it has been reliably established that it almost never descends to depths of more than 300 meters. Blue sharks are seen quite often by sailors, as they often accompany ocean liners. Just like such species of sharks as salmon and herring, the blue one is very numerous, and it lives in both tropical and temperate latitudes(there is evidence that it is sometimes found even in the waters of Primorye).
The blue shark has a rather remarkable appearance, by which it is not at all difficult to recognize it. The body of this fish is very “slender”, elongated, and the pectoral fins are very long. This " live torpedo"has an elongated head with a narrow snout, and rather large eyes, protected by the third eyelid (nictitating membrane). The blue shark breathes, of course, with the help of gills, which are located on the sides of the head, where there are five gill slits on each side. Next to the nostrils of this fish there are small folds of skin - nasal valves, as well as a nostril groove, which is hallmark sort of gray sharks, to which it belongs according to the generally accepted classification.
The teeth of the blue shark, located on the upper jaw, are triangular in shape and equipped with serrated edges, and those present on the lower jaw are similar to awls, having a slight slope towards the mouth. This “design” allows the predator to firmly hold even slippery and big catch, while cutting off pieces from it.
The long and narrow pectoral fins of the blue shark are crescent-shaped, which, along with the elongated “thin” body, is its characteristic feature. There are two fins on the back of this fish, with the front one being significantly larger than the back one. Unlike, say, the herring shark, the caudal peduncle of the blue shark is somewhat flattened laterally, and has quite longer length, but she has no keel at all. The caudal fin is also quite remarkable: its lower blade is much smaller in size than the upper one, with a notch that forms a kind of flag.
As for the color of the blue shark, it fully corresponds to its name. The back of this ocean predator is really blue, and its shades can vary from very dark to light blue. On the sides the color is not so rich, and the belly of the fish is almost white. There is information that fishermen have caught specimens of blue sharks about six meters long in their nets, but this has not been documented. The largest individual of this fish, which was measured and weighed, had a length of 3.8 meters and a mass of about 400 kilograms. At the same age, male blue sharks are smaller in size than females.
Despite the fact that the habitat of blue sharks is very wide, most often they are still found in moderate warm waters subtropical climate zone of our planet. There are quite a lot of them in the Mediterranean Sea, they are often also seen in the Aegean and Ionian Seas, as well as in the northern part of the Adriatic Sea, and at relatively shallow depths.
Typically, blue sharks swim rather slowly and even somewhat lazily, carefully studying their surroundings to detect prey. As soon as a potential victim appears in their field of vision, they make sharp lunges, during which they can cover very impressive distances in fairly short time intervals. Reputable researchers claim that blue sharks are second only to mako sharks in their speed, and the speed they can reach exceeds 40 km/h.
Blue sharks are schooling fish, and the communities they form can include several dozen individuals. The basis of their diet consists of fish such as mackerel, tuna, herring, and squid. At the same time, it often happens that satiated predators caught in a school of these mollusks regurgitate the contents of their stomachs and continue their meal. This behavior is due to the fact that sharks, obeying instinct, strive to create reserves in their own bodies in case Hard times and the food situation will not be the best.
The behavior of blue sharks is characterized by the fact that as soon as they notice prey, from sedentary and “half-asleep” fish, they instantly turn into swift and merciless creatures. Scientists say that sometimes they even experience a real food fever, and at such moments it is extremely dangerous to be near them.
Blue sharks are not at all picky when it comes to food, and do not even disdain carrion. They are capable of eating any organic compounds, and sometimes specifically follow sea vessels in order to eat waste thrown into the ocean.
This species of shark is viviparous, and within last months During their development, embryos receive nutrients from the mother's body through the placental connection. The length of newborn sharks reaches fifty centimeters, and as for sexual maturity, males reach it when their sizes range from 1.9 to 2.8 meters, and females - from 2 to 3.5 meters. In the body of female blue sharks, sperm are stored for several months after copulation, and pregnancy that occurs after fertilization lasts from 9 to 12 months. The number of embryos that a blue shark can simultaneously carry in its womb can range from 4 to 54. These fish breed outside the tropical climate zone, and one of their largest “maternity hospitals” is the region of the Adriatic Sea, located near the coastline limited resorts of Rimini and Punta de la Maestra. There you can almost always see many pregnant females, as well as recently born sharks feeding on small fish.
There is a known case when a blue shark, lifted aboard a research vessel, gave birth to 52 baby sharks, which were completely independent and full-fledged individuals capable of leading an independent life. Scientists placed several newborns in an aquarium, where they felt great. It should be noted that blue sharks are considered dangerous to humans, and this is fully confirmed disappointing statistics. The fact is that they are not shy (unlike, for example, reef sharks), and quite boldly approach diving enthusiasts, especially in cases where they are diving at a great distance from the shore.
In those days when whaling was not yet prohibited, blue sharks often accompanied ships on which these sea animals were butchered and picked up the offal. Sometimes it happened that whale carcasses were dissected directly in the water, and then sea predators a real feast began, during which they tormented whale carcasses even when people stabbed them.
There are different opinions about the aggressiveness of blue sharks. Some believe that these fish attack, in the literal sense of the word, everything that moves, while others, on the contrary, are of the opinion that these predators are quite lazy by nature and if they show their hunting temperament, it is almost exclusively in relation to fish or squid As is usually the case, the truth is somewhere in the middle, and attacks on people caught in ocean waters during shipwrecks or any other disasters are most often carried out not by blue sharks, but by other sharks.
These creatures are the object of sport fishing, and they are most often caught with fishing rods. According to statistics, the largest specimen caught in this way weighed almost 206 kilograms, and it was caught near the coast of the town of Martha's Vineyard, in Massachusetts (USA).
Since the blue shark does not belong to the category of large ones, sports fishermen most often use 44 kg class rods to catch them. Practice shows that the best bait in this case is fresh mackerel, both its whole carcasses and thinly sliced strips as part of the bait. By the way, these predators have extremely sensitive olfactory organs, and therefore bait is almost always used to attract them to the hook on which the bait is attached.
It should be noted that with this method of fishing, specimens of blue sharks are usually caught, the weight of which does not exceed 45 kilograms, and the length is one and a half meters, and they must be released into the wild after capture. One of the leading institutions in the field of studying these fish is the Narragensett Marine Fisheries Laboratory, located in Rhode Island. Its staff is implementing a fish tagging program in order to trace their migration routes, as well as obtain information about their lifestyle.
And judging by the research results obtained, it is quite interesting and not easy. In fact, blue sharks are natural wanderers who travel across the vast ocean expanses of our vast planet, and therefore scientists are not at all surprised by the fact that an individual tagged off the coast of the blessed Canary Islands, are eventually caught in the South Atlantic Ocean. It has also happened that blue sharks caught and tagged off the coast of New England were subsequently caught in nets in the Pacific Ocean.
The meat of blue sharks is quite actively consumed as food, and in gastronomic terms it is considered one of the most valuable. It contains practically no ammonia, it can be eaten smoked, dried and dried. Blue sharks are the target of active fishing, and this has led to the fact that in recent years the number of these fish in the World Ocean has begun to decline rapidly, and they are being caught less and less often in fishing nets. According to some reports, only a few recent years The blue shark population has dropped by almost 80%.
These predators are threatened with complete extinction, and if the world community does not take urgent and effective measures aimed at preserving them in the very near future, then it is quite possible that this species of fauna will be irretrievably lost. It is for this reason that blue sharks are included in the International Red Book.
Domain: Eukaryotes
Kingdom: Animals
Type: Chordata
Class: Cartilaginous fish
Squad: Carchariformes
Family: Gray sharks
Genus: Blue sharks (Prionace Cantor, 1849)
View: Blue shark
Habitat
The distribution range of this predator is very wide. The blue shark can be found in tropical, subtropical, temperate and even cold temperate latitudes. In the Pacific basin it is found south of New Zealand in the south and up to Japanese islands And south coast Alaska in the north.
In the Atlantic, mokoya can be seen from Norway to the southern tip of Africa and South America, V Indian Ocean– from southern shores Africa and to the southern coast of New Zealand. Conventionally, the geographical boundaries of the blue shark's range can be drawn through parallels of 50 degrees. in the north and south. This fish is not found in the waters of Russian seas, unless you take into account unofficial information that fishermen have seen blue sharks in the southern waters of Primorye. There is no reason to deny this possibility, but in these cases there could have been an erroneous identification of the species.
Prefers the upper layers of water, rarely dives deeper than 300 m. This fish can be found near the coastal zone of continents, islands, and in open ocean waters. However, the blue shark is generally considered to be a pelagic fish, since it is more often found away from the coasts. It feels most comfortable in water with a temperature of +7 to +16 degrees. C, but does not bypass the warm tropical seas.
Description
The blue shark (blue shark, great blue shark, mokoi) is a species of cartilaginous fish from the family of gray sharks. This is the most common shark on Earth. It lives both near the coast and in the open oceans.
The blue shark has a slender, even “thin” body with pectoral fins elongated shape. The eyes of a blue shark are round and large, they are protected by the third eyelid, that is, the nictitating membrane. Five pairs of small gill slits are located on the sides of the head. The blue shark has a white belly and bluer sides and back. Weight Limit The great blue shark weighs almost 400 kilograms and reaches a length of almost 4 meters. The lower teeth are different from the upper ones; they are triangular, without side teeth and have a beveled shape. The blue shark is capable of holding and tearing slippery prey. The lower teeth of the fish hold the prey, and the upper teeth tear off pieces.
Behavior
This species feeds near the sandy bottom, avoiding coral reefs and rocky bottoms. The usual depth for these fish is 20-60 meters. This species is characterized by seasonal migrations, which are directly related to water temperature. In summer, marine predators move north, and in winter they return to southern waters. It is noteworthy that males migrate in flocks, while females swim alone. In the waters that all year round warm, for example, the Hawaiian Islands, gray-blue sharks live constantly.
Nutrition
The main food for blue sharks are schooling ocean fish: tuna, mackerel, herring, etc. A significant portion of the diet consists of squid. You can often see a picture where a predator caught in a dense school of squid fills its belly so tightly with the delicate bodies of mollusks that it can no longer swallow them. Then the shark regurgitates the excess food and continues to greedily grab the prey.
Open ocean waters do not often contain so much food, so the predator instinctively tries to create reserves in the body. This usually relatively sedentary shark completely transforms at the sight of food. Often in a school of blue sharks it covers known state hunger madness, or food fever. At such moments it is especially dangerous to be close to predators. The blue shark is not picky when choosing food - it can consume any organic matter, including carrion. Sometimes blue sharks accompany slow-swimming sea vessels for a long time, eating ship waste.
Reproduction
This is a viviparous species of shark in which the yolk sac forms the placental connection between the mother and the embryo. In a litter there are from 4 to 135 newborns measuring about 40 cm. Pregnancy lasts 9-12 months. Females reach sexual maturity at the age of 5-6 years, and males 4-5. During the prelude to mating, the male bites the female, so the sex of sharks can be easily determined by the presence or absence of scars on the back. Females have skin on their backs that is 3 times thicker than males. Maximum life expectancy is estimated at 25 years.
Can you eat shark meat?
About twenty million blue sharks die every year in fishing nets. Despite the fact that this fish is not very popular as food, blue shark meat is used in cooking. Fish meat is sold in the market under names such as “ sea eel», « gray fish"or "stone salmon".
Shark fins are used in soups, vitamins are made from liver oil, and fishmeal is also made from sharks.
Conservation status
This species has a status close to vulnerable. And the reason is that the blue-gray shark has a high commercial value due to delicious meat, skin, liver, fins. In 2006, mass commercial fishing of these fish was banned in many countries around the world. Only a small number of vessels are allowed to catch these marine predators, mainly for research purposes.
Danger to humans
It is a dangerous predator species for humans, which is confirmed by statistical data. These sharks are not as shy as most species of reef sharks. They can safely approach swimmers and divers, especially when far from shore. Often such attempts at contact end in an exploratory bite. During the butchering of whales killed in the area where this species lives, sharks often approach the whaling ships and greedily devour the edible pieces.
In the old days, when the cutting of whales was carried out directly in the water, they tormented the carcasses of these animals, showing no fear of the cutting knives, and did not stop their work even after inflicting serious wounds on them. There are different opinions about the aggressiveness of blue sharks. Some believe that blue sharks are extremely ferocious and aggressive and are capable of attacking anything that swims near them.
However, others, on the contrary, believe that the blue shark is a lazy fish that attacks exclusively slow and not dangerous creatures, such as squid or sepia. Perhaps the truth lies somewhere between these opinions. What is known for certain is that in reprisals against people, shipwrecked in the open sea, longimanus, tiger and blue sharks most often take part.
Studying
Blue sharks are being carefully studied by staff at the Narragansett Marine Fisheries Laboratory in Rhode Island. government agency, which runs an extensive program of tagging fish to study their migrations and lifestyle. Judging by the tags returned to the laboratory, blue sharks roam all over the world.
One day, a blue shark tagged off the Canary Islands was later discovered in South America; this is the first documented case of a shark crossing Atlantic Ocean. It happened that blue sharks tagged in the waters of New England were then caught in the area of Labrador, that is, 1800 miles to the north, and Guiana, that is, 2200 miles to the south.
According to the Narragansett Laboratory, a blue shark's routes depend on its age and gender. Juveniles and some adult male New England blue sharks winter in the Gulf Stream region, but most adult males make the 2,000-mile journey to spend the winter off the northeastern coast of South America. Females also leave New England waters in winter, migrating south about 700 miles from their summer hunting grounds.
- Great blue sharks do not live long in captivity. They are rarely kept in aquariums and swimming pools, as they are not adapted to captivity and die quickly. They bump into aquarium walls and other obstacles;
- The shark from the New Jersey Aquarium lived the longest in captivity. She managed to live there for only seven months, but a bacterial infection crippled her;
- Unlike reef sharks, blue sharks are not shy and calmly swim towards divers. However, they can bite purely out of research interest. Fatalities have also been reported in attacks by blue sharks (blue sharks).