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I will say right away: this film, however it may be, can be evaluated positively only and exclusively with a loyal attitude to thrash. If you do not belong to connoisseurs, feel free to pass by, this movie is not for you.
And now for those who are “in the know”. From the fifth attempt suddenly happened. “The attack of the six-headed shark” turned out to be solid, moderately funny, a little less bloody than I expected, but undeniably interesting. The plot this time is devoted to family values and even carries some kind of morality. Holes in history can be found if you wish, but such a rush somehow does not arise.
An unusual set of characters is present (finally thrash without drunken teenagers!), And there is almost no “cardboard” in them. There are almost no puppets introduced into the picture just to die, this time - which undoubtedly pleases.
The monster got a more or less intelligible story of occurrence. Visually, however, it is embodied rather clumsily. But the not very expensive computer model in a strange way harmoniously fits into the general delusional narrative, and does not attract mockery at it. Perhaps, the creators with the realism of a monster would be rotted, it would be just the opposite.
As a result, we can say the following: “The attack of the six-headed shark” is quite a good entertainment for one evening for fans of trash.
Origin of view and description
Photo: Tiger Shark
The first ancestors of modern sharks lived on Earth in the Silurian period (420 million years BC). But what kind of fish they were - a debatable question. The most studied cladoselachia - they have a body structure similar to sharks, but less perfect, which did not allow them to develop an equally high speed.
They evolved from placoderms, shark-like predators - according to one version of the marine, according to the other freshwater. The descendants of cladoselachia were not left, but most likely the ancestor of the sharks became one of their related and modern fish.
Video: Tiger Shark
From this it is clear that the early evolution of sharks is very foggy and causes controversy: for example, it was previously believed that their ancestor was gibodus, a predatory two-meter fish that appeared in the Carboniferous period. But now scientists are inclined to believe that gibodus was only a sideline of the evolution of sharks.
The situation clears up in the Triassic period, when fish appear, already unambiguously classified as sharks. They flourished even then, but a great evolutionary shift occurred along with the widely known extinction of dinosaurs, and with them most of the other fauna.
In order to survive, the sharks that inhabited the planet then had to significantly rebuild, and they acquired many modern features. It was then that karhariformes appeared, considered the most perfect of the sharks in structure. The tiger shark belongs to them.
The modern look is the only one belonging to the genus of the same name. The history of the classification is rather complicated and confusing - its name in Latin had to be changed more than once or twice. It was described in 1822 by Lesjueur and Peron under the name Squalus cuvier.
But just three years later, in the work of Henri Blenville, her position in the classification of species was changed, and at the same time she became known as Carcharhinus lamia. In 1837 it was again moved, highlighting the genus Galeocerdo, a species of Galeocerdo tigrinus.
At that point her “journeys” were completed, but one more change was nevertheless made - the one who first classified him had the right to give a name, and although the generic name had to be changed, the species was returned to its original name. And so it turned out the modern Galeocerdo cuvier.
Appearance and features
Photo: Great Tiger Shark
The upper body is gray with a bluish tint. Marked by stripes and spots of a darker color - it was because of them that the tiger shark was so named. The lower part is lighter, has a dirty white color. In young individuals, the color is richer, the spots are very clearly distinguishable, and gradually “fade” as they grow older.
It has a wide snout and a small splatter, as well as a very large number of teeth, differing in size and sharpness. At the edges they are serrated and very effective: using them, the shark very easily cuts flesh and even bones. A powerful jaw helps to do this, thanks to which the shark is able to crush even the shell of a large turtle.
Breathers are located behind the eyes, with the help of which oxygen enters directly into the shark’s brain. Her skin is very thick and at times surpasses bull skin - to bite it, you need to have no less large and sharp teeth than the tiger shark itself. In a battle with opponents who do not have equally powerful teeth, she can feel as if in armor.
The addition of a tiger shark seems cumbersome compared to other species, the ratio of length and width makes it visually “chubby”. Moreover, most of the time she swims slowly and not too gracefully. But this impression is deceptive - if necessary, it accelerates sharply, reveals dexterity and maneuverability.
The tiger shark is one of the largest active hunters, and is inferior in length to only white. However, in comparison with really large sharks, its size is not so large: on average from 3 to 4.5 meters, in rare cases it can grow up to 5-5.5 meters. Weight is approximately 400-700 kilograms. Females are larger than males.
Interesting fact: Shark teeth are always so sharp and deadly because they are regularly updated. For five years, she changes more than ten thousand teeth - a fantastic figure!
Where does the tiger shark live?
Photo: Tiger Shark Fish
They like warm waters, and therefore mainly live in the seas of the tropical and subtropical zones, as well as in the warmest of those that are in the temperate. Most often swim in coastal waters, although they can swim in the open ocean. They can even cross the ocean and sail to the opposite end, or even to the other.
The largest number of tiger sharks can be found in:
Their range is not limited to this, predators can be found in almost any warm sea. The exception is the Mediterranean, where they do not occur, despite suitable conditions. Although they are in the open ocean, but most often during migration, they usually stay close to the coast, mainly because there is more prey.
In search of prey, they can swim to the shore itself, as well as swim in rivers, but they are not removed from the mouth. They usually don’t dive to great depths, preferring to stay no more than 20-50 meters from the surface of the water. But they are capable of doing this, they were even seen at a depth of 1,000 meters.
Interesting fact: They have Lorenzini ampoules - receptors that respond to electrical signals from vibrations, even very weak ones. These signals are transmitted directly to the brain of sharks. They are captured only from a short distance - up to half a meter, but are more accurate than those coming from the organs of hearing and vision, and allow you to calculate the movements deadly true.
Now you know where the tiger shark lives. Let us now see what this dangerous predator eats.
What does a tiger shark eat?
Photo: Tiger Shark
In food, it is completely illegible and is able to eat anyone and anything.
The basis of its menu is:
- sea lions and seals,
- fish, including other sharks, cannibalism is not alien to them.
The appetite is truly atrocious, and she is hungry for most of the day. Moreover, even if you just ate a hearty meal, anyway, if you had the chance, you could not resist biting something floating nearby if you hadn’t tried it before.
"Something" - because it applies not only to animals, but also to any garbage. Many strange objects were found in the stomachs of tiger sharks: car tires and fuel cans, deer horns, bottles, explosives - and many other similar things.
We can say that this is curiosity: a tiger shark is always interested in what an unprecedented object tastes and whether it is edible at all. If there is no ordinary food nearby, instead of a long search, tiger sharks attack those who eat: for example, dolphins or crocodiles.
They can even attack animals larger than themselves, for example, whales, if they are wounded or sick, and can not resist. The danger threatens not only small whales, but also large ones - for example, in 2006 a case of an attack on a humpback whale by a whole group near Hawaii was recorded.
Their jaws are powerful and wide, which makes it possible to cope even with such prey. But for the most part, their menu still consists of small organisms. Eat and carrion. A tiger shark is also able to eat humans - this is one of the most dangerous species, since they can purposefully hunt people.
This species is common in the tropical zone of the Indian and Pacific Oceans. This is one of the most common sharks of coral reefs, inhabited by reefs of various types, living at depths of several meters. These sharks are small representatives of the family; they do not exceed 2 meters in length and weigh 45 kg. They are found at depths of 30 cm and less.
Due to its small size, it is mainly not dangerous to humans. Although there are known cases of attacks on swimmers from black-feathered reef sharks. In all the cases noted, shark aggression was triggered by the smell of blood flowing into the water from fish harpooned by humans.
Black-feather reef sharks are sissies. For example, once during transportation due to personnel error, the water in the tank turned out to be two degrees below the possible minimum, and sharks died from hypothermia. In another case, the 35-year-old English comedian Guy Venables, who took part in a show at one of Brighton's nightclubs, jumped into a shark aquarium. The result of this antics turned out to be sad: a 12-year-old shark died of fright.
Mustachioed nanny shark
This shark can reach 4 meters in length, but usually does not exceed 2.5-3 meters. Chet somehow resembles a catfish:
Keeps at a depth of 0.5 to 3 meters, can be collected in flocks of up to 40 individuals
Slow and inactive nanny sharks feed on crabs, octopuses, sea urchins, and small fish.
Shark nannies are generally safe for humans.
Sand tiger shark
This predator usually reaches 3.5-4 meter long.
Despite the rather frightening appearance, sand tigers are quite peaceful and attack people only for self-defense.
It should be noted the original method of maintaining buoyancy used by this type of shark - swallowing air and retaining it in the stomach.
Sand tiger sharks are distributed mainly in warm climatic zones, especially a lot of them off the Australian coasts. The largest population lives off the coast of North Carolina, off the sunken ships.
Sand Tiger Teeth:
Currently, tiger sand sharks, like many other species of sharks, are on the verge of extinction. All this led to the inclusion of sand tiger sharks in the list of protected fish and their inclusion in the international Red Book.
Scuba divers to display the size of the shark hold a 3-meter ruler:
Hammers are large sharks. This is the most unusual shark. The main distinguishing feature of the hammerhead shark family is the shape of their head - it is of an absolutely unusual shape — T-shaped, with eyes on the edges.
According to one theory, the shape of a hammer shark’s head acquired gradually, over millions of years, each generation expanded to a tiny distance. According to another theory, such a hammer did not appear as a result of gradual changes, but was the result of a bizarre mutation that suddenly happened.
These sharks inhabit the warm and temperate waters of the Pacific, Indian and Atlantic oceans at depths of up to 300-400 meters. These aggressive hunters feed on various species of fish, octopuses, squids and crustaceans.
Hammerhead sharks (except the giant hammer) are up to 3.5-4.2 meters and weigh about 450 kg.
In search of food, the hammerhead shark is mainly helped not by the eyes, but by special receptors of electromagnetic impulses. A predator can pick up electrical discharges in one millionth of a volt!
Due to its large size, many researchers consider the hammerhead shark one of the most dangerous for humans. But on purpose, she does not attack people. Many of the attacks that took place in front of many viewers have documented evidence. Once, in 1805, three hammerhead sharks hit the net on Long Island at once. In the stomach of the largest of them was discovered the torso of a person.
One of the types of hammers - a giant shark hammer (average length 4-5 meters) - is listed in the International Red Book:
The whale shark is the largest species of sharks, as well as the largest living representative of fish.
Although, according to some eyewitnesses, they met specimens from 18 to 20 m long, the largest specimen ever measured was 13.7 m long. The weight of whale sharks can reach 12 tons.
Despite its impressive size, it eats like a giant shark exclusively with plankton and other small organisms, which it filters, drawing water into itself through a pharynx with a diameter of 10 cm.
Whale sharks prefer water temperatures from 21 to 25 ° C and are distributed throughout the world, found in almost all warm tropical and many subtropical seas on both sides of the equator and near it.
A whale shark is not dangerous for humans and behaves peacefully. She not only does not attack, but even turns if the swimmer is in her way.
It has been estimated that whale sharks can live up to 100 to 150 years.
Galapagos Gray Reef Shark
Usually found in tropical waters near islands in all oceans. Sharks live at the bottom and prefer to stay close to the coastline next to underwater cliffs and coral reefs with a strong current. These sharks reach a size of 2.5 meters.
The Galapagos gray shark is one of the few that demonstrates its intention to attack: before the attack, it arches its back, raises its head, lowers its fins, and during swimming it spins and rolls from side to side. It refers to species dangerous to humans.
The nose of sharks is sensitive to certain odors and can determine the presence of blood at a concentration of 1: 1000 000, which can be compared with a teaspoon of blood poured into the pool.
Their other feature is curiosity: sharks accompany ships, poke aboard, hit the oars and chase scuba divers.
The life expectancy of the Galapagos shark is about 24 years.
The giant shark is the brightest representative of the largest species of fish. This is the second largest fish species after the whale shark. It reaches a length of up to 10 meters and weighs about 4 tons.
Like the whale shark, the giant shark feeds on plankton, but does not absorb water, but simply swims with its mouth open, filtering through the gills everything that enters it.Thus, a giant shark is able to filter up to 2000 tons of water per hour.
Giant sharks are found in both the eastern and western hemispheres, preferring cool or moderately warm latitudes and following the presence of plankton.
The giant shark is safe for humans and today it is threatened with extinction.
Females reach a length of 4 meters, males up to 2.5 m. The maximum documented weight of the caught bull shark was 316.5 kg. On average, a bull shark lives 27-28 years.
The bull shark rightfully takes 3rd place in the list of the most dangerous type of sharks for humans. This is an extremely aggressive animal, entitled to claim the title of ideal and omnipotent predator. It is almost impossible to escape from a horrible monster attacking a swimmer.
Scuba Diving Feeding:
These bloodthirsty predators usually attack in the morning or late twilight, and often at a shallow depth - only 0.5m - 1m.
The behavior of bull sharks is impossible to predict. They can swim peacefully for a long time, and then suddenly attack the swimmer. This attack can turn out to be either a simple research bite or a clear attack.
Great White Shark
This huge predator rightfully takes the 1st place in the list of the most dangerous species of sharks for humans.
It is officially stated that on August 17-18, 2011 in Primorye, in both cases, bathers were attacked by the same fish - a white shark at least four meters in length.
“White Death” - under this name this exceptionally large shark is known, found in the surface coastal waters of all the major oceans of the Earth. Reaching a length of more than 6 meters and a mass of 2 3000 kg, it is the largest modern predatory fish. Great white sharks - they are like torpedoes, with a powerful tail, thanks to which they move in water at a speed of up to 24 km / h.
Scientists have determined the size of the largest specimen, the length of which has been reliably measured and is 6.4 meters. This great white shark was caught in Cuban waters in 1945, measured by experts with documented measurements. The unconfirmed weight of this Cuban shark is 3,270 kg.
A wide mouth and sharp teeth of a triangular shape, arranged in several rows. Experts advise when attacking sharks "to strike in the face, eyes and gills." It is doubtful that such measures will help repel the attack of a 5-meter-long predator, which, through millions of years of evolution, has honed its ability to kill.
The number of teeth of a great white shark, like that of a tiger, is 280-300.
Nevertheless, the great white shark is on the verge of extinction - on the Earth of these beautiful, ancient predators, only about 3,500 copies remain.
Features of character and lifestyle
Photo: Tiger shark in the sea
The tiger shark spends most of its time searching for prey. In this case, it usually moves rather slowly so as not to frighten away the victim, but then it transforms in an instant and makes a lightning jerk. Due to the high dorsal fin and the shape of the snout, it quickly changes the direction of movement and is even able to turn around its axis almost instantly.
If many other aquatic predators have poor eyesight, which compensates for their excellent sense of smell, then nature generously endowed tiger sharks with everyone: they have a wonderful scent and vision, and in addition there is a side line and Lorencini ampoules, thanks to which they are able to detect the movement of each muscle victims - this allows you to hunt even in troubled waters.
The shark's scent is so good that a drop of blood is enough to rivet her attention for miles. All this makes the tiger shark one of the most effective predators and, if it is already interested in someone, the victim's chances of salvation become very low.
But the tiger shark also likes to relax - just like tigers, it can lie quietly for hours and bask in the sun, for which it swims to the sandbank. Most often this happens in the afternoon, when it is saturated. It usually goes hunting in the morning and late evening, although it can do it at other times.
Interesting fact: If some prey particularly likes the tiger shark or tastes like easy prey, it will continue to hunt for representatives of the same species. This also applies to people: in 2011, on the island of Maui for two years they tried to catch a cannibal shark. Despite the closure of the beaches, during this time she ate seven people and crippled twelve more.
Social structure and reproduction
Photo: Great Tiger Shark
Usually kept alone, and at a meeting may come into conflict. This happens if they are angry, or very different in age and size - then a larger individual may simply decide to eat the smaller one. Sometimes they still gather in groups of 5-20 individuals.
This can happen when there is plenty of food, but such groups are unstable, conflicts often arise in them. A group of a dozen tiger sharks is capable of killing very large prey, and becomes dangerous even for whales, as well as for other, larger and not so fast sharks. Although mostly they continue to eat smaller animals.
The breeding season occurs once every three years. Aggressiveness stands out even the mating ritual of tiger sharks - they do not change themselves in this. In its course, the male must bite the female by the fin and hold it, and this is not a gentle bite at all: wounds often remain on the body of the females. However, shark pains still do not feel - their body produces substances that block it.
Fertilization is internal. The cubs are born for more than a year, after which about 12-16 fry are born, and in some cases up to 40-80. Tiger sharks are ovoviviparous: the cubs hatch from the eggs also in the abdomen, and are born already in a developed state.
This is very useful, because the mother will not show any care towards them, and right after birth they will have to independently earn their own food and defend themselves. The maternal instinct of a tiger shark is absent, and it does not eat its own cubs only because it has lost appetite before childbirth, and for some time it remains in this state.
Natural enemies of tiger sharks
Photo: Tiger Shark Fish
For young and growing individuals, many large predators pose a danger, although in most they are slower. As the threats grow, it becomes less and less, and adult fish can practically not be afraid of anyone. The most formidable enemies are: swordfish, marlin, stingrays and rhombic stingrays, other sharks, primarily relatives.
But only sharks were the first to attack, and this rarely happens, so there are few worthy opponents of tiger sharks. But this is only limited to those that can measure their strength with them and engage in a direct battle, but there are others who are much more dangerous for this fish.
One of the worst enemies of a tiger shark is a hedgehog fish. It is quite small and does not attack itself, but if a tiger shark swallows it, then already inside the predator this fish becomes a prickly ball and pierces the inside shark, which often leads to death. Another common cause of shark death is parasites.
People also exterminate a large number of them - perhaps it is from human hands that the bulk of these predators die. In this case, everything is honest: the shark is also not averse to feasting on humans - dozens of attacks occur every year, because tiger sharks tend to swim in crowded places.
Interesting fact: The tiger shark is so indiscriminate in food because its gastric juice has a very high acidity, which allows it to digest a lot. In addition, after a while after each meal, she simply burps up undigested residues - so sharks usually do not suffer from stomach problems. If you did not swallow the hedgehog fish.
Population and species status
Photo: Tiger Shark
Tiger sharks are a commercial species, their liver and dorsal fins are especially highly valued. Their skin is also used, and meat is eaten. In addition, sometimes they are hunted and just out of sporting interest, some fishermen dream of catching such a formidable fish.
Catch limits have not yet been established, since their population is quite high, and they can not be attributed to rare species. At the same time, due to active fishing, their livestock decreases, in individual seas, to critical values.
Therefore, although the species as a whole is still far from the threat of extinction, environmental organizations are trying to limit the extermination of these predators: if it continues at the same pace, their entry into the Red Book will be inevitable. They do not contain tiger sharks in captivity: attempts have been made repeatedly, but all failed because they quickly died.
Interesting fact: Tiger sharks are one of the most popular targets for sport fishing. It is very difficult to catch such a fish, and besides, it is considered a dangerous activity (although with proper preparation, the risk is minimized). Therefore, the tiger shark, along with other predatory sharks, is a very prestigious trophy, included in the unspoken "big five" along with swordfish, sailfish, large species of tuna and marlin.
Forever hungry Tiger shark - One of the most perfect predators of the sea. The features of their structure are very interesting, they are taken into account when designing ships, planes and other equipment - evolution has generously endowed these fish with advantages that allow them to manage in the seas, and still not all of their secrets are revealed.