Chordates door, vertebrate subphylum, cartilage Pisces, elasmobranch subclass, Head side holes According to the 1971 classification system down into Las Six-gill shark head head porbeagle sharks Tiger sharks Head Head Head dogfish shark saw flat head shark frilled shark Head Head Head 8 Sharks, considered by some the most ferocious of marine animals. Whale shark with small marine life for food, and baleen whales almost. As the food has a certain similarity, the long period of evolution, they look very similar to the point, and baleen whales, this is called "convergent evolution." So "whale shark" the name for granted. Of course, the whale shark is the largest existing, but also the largest known fish.
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The characteristics of sharks
Sharks body hard, muscular, was spindle varying degrees. Part due to different type of nose, a pointed, such as mako shark and great white sharks; also have large, round, for example, tiger sharks and tiger shark's head was wide and flat. Upright tail (caudal fin), roughly crescent, most types are far greater than the lower part of the upper caudal fin. Shark swimming depends mainly on the movement of the body like a snake and with the same tail as the oars swing forward. Stability and control are mainly based on the number of some vertical and horizontal scheduling of pectoral fin. Most sharks can not be regressive, so it is easy to fall into obstacles such as gill nets, but also a difficult to extricate themselves into. Sharks do not swim bladder, so the proportion of these animals mainly by the liver to determine the amount of stored fat. Sharks slightly larger density than water, that is, if they do not actively swimming, they sink to the seabed. They swim very fast, but only to maintain high speed in a short time. Talked about why the sharks do not swim bladder, which is related to a legend: in a long time ago, God created the fish, the shark is just a small fish. One day, suddenly thought of God, the contribution of the fish, just as a reward for all the fish swim bladder. But the naughty little sharks are in play, until after the small sharks know that God had gone. Can only keep a small shark swam ah tour. Swim more strong. Years later, God came up inspections found that the strongest shark find it very strange that he was very fair each fish it! Why is this the only shark? He asked why the shark, shark replied: "Because then my ancestors did not get your gift, so he kept swimming, swim more stronger!" Sharks have 5 to 7 on each side of gill slits (like we usually buy the carp from the market, there is a patrol gill gill cover), swimming in the sea when inhaled through the mouth half open, out from the gill gas exchange. The mouth of a shark swimming Zhang looks really terrible, but you can not let people breathe? A small number of shark species can be stopped at sea to breathe.
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Sharks
University of Hawaii marine biologists said they had received a first-hand evidence that sharks can detect changes to the Earth's magnetic field. This discovery proves the existence of a marine fish stocks within the "Compass" system to guide their direction to provide a new example. This latest study, published in the UK on the Royal Academy of Sciences. University of Hawaii marine biologists - Karl Meyer and his colleagues planned the design of the trial. Them in an artificial magnetic field environment, training six sandbar sharks and a hammerhead shark. The artificial magnetic field environment is the sinks with a diameter of 7 meters, the external wound with a layer of copper cable, when put in food to the tank, cable switch will turn on to simulate the magnetic field. After six weeks of training, regardless of the cable when the switch opens, even if no food to put in the tank, the shark will still flock to normal feeding area. This reaction proved they feel the presence of the magnetic field. For this test before the scientists, some of the habits of sharks have been so strange to shark scientists speculate may have this special ability. Tiger sharks, blue sharks in the ocean Zhong You can go straight to a very long distance, if only relying on the sense of smell is impossible. Hammerhead are often assembled in the mountains near the sea, and these mountains are changing Earth's magnetic field zone. The next step is to research scientists figure out how to identify the Earth's magnetic field sharks and their degree of sensitivity for the magnetic induction. Not long ago, scientists have recognized the other animals also have the ability to identify the magnetic field. North Carolina State University researchers proved by experiment, pigeons on the beak with tiny magnetic particles that can help complete the long-distance flight pigeons.
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Sharks and Cancer
The past 20 years, shark's fin on the market more and more fire deal, millions of sharks every year several brutally slaughtered. In the IUCN's "Endangered Species List in 2004", they also added at least 10 species of sharks, including great white shark, the New England and the Gulf of Mexico shark gill shark white kiss. A large number of sharks being killed is an important reason is that people accept the Shark (including the famous "shark fin") may promote cancer of the error. According to the Russian News Network recently reported that Johns Hopkins University, Department of Biology and Professor of Comparative Medicine Gary Ostrander, in its recently released a research report that the sharks will be the same cancer. Meanwhile, the consumption of shark cartilage for cancer treatment has no significant effect. Professor Gary Ostrander, now rising trend of consumption of shark's diet, but a "pseudo-science" by the victory of marketing. He said the consumption of shark cartilage for the treatment of patients not only useless, on shark populations can also cause great harm - the patient would tend to blindly believe that the efficacy of cartilage refused other treatment, wantonly killing activity has also caused the number of sharks decline rapidly. Sharks have been regarded as insulators cancer, the cartilage powder being promoted as cancer cure. As early as 1983, two Massachu_set_ts Institute of Biochemistry, Dr. Lee and Robert Langer Anen in the famous U.S. "Science" magazine published an article that squalene in shark cartilage angiogenesis for cancer cells has a blocking effect, and confirmed that inhibit cancer cell growth. 1993, U.S. cbs television "60 Minutes" invited "Sharks never get cancer," the author, Dr. William Lance, shark cartilage for cancer research to discuss the results, a number of advanced cancer patients in the program that taking shark cartilage capsule after a few weeks feeling symptoms. Since then, the shark cartilage cancer will claim through books, articles, websites and vendors widespread. Subsequently, the pharmaceutical companies in the market introduction of a connective from the shark pills made of fibrous tissue, known as shark liver oil capsules which are "good medicine for the treatment of cancer" and create a shark cartilage products, with annual sales of more than 50 million U.S. dollars for a market One of the biggest manufacturers of shark cartilage is the son of Dr. William. In 1994, the U.S. Food and Drug Administration (fda) formally approved the use of shark cartilage products for cancer prevention. As a result, shark cartilage products, health products has become a hot market, influence is felt around the world. In China, shark cartilage products and restaurants selling shark soup was very hot. The late 90s of last century, shark cartilage powder anticancer way into China. At that time, the sale of shark cartilage products on the market are two major categories: one is the physical processing of shark cartilage by bone, the other is to extract the active chemical extract. The former in addition to vigorously promote the anti-cancer number of "active ingredients", but also claimed that the fineness of grind bone meal however pay attention to, fineness of 200 mesh or more must, in order to be absorbed by the body, the more detailed the better fineness. What are some of the products that the fineness of the United States has reached the 300 target, thereby greatly increasing the activity of the active ingredient in the bone mass for the body to absorb protein level. The latter claimed, from shark cartilage tissue is very complex, purified extract has anti-tumor function of two angiogenesis inhibitors, and are made based on this component of the shark cartilage capsules, shark cartilage powder series of anti-cancer drugs. The drug in the Chinese market was very popular. Since sharks have this unique anti-cancer function, social eating shark is also "hot", especially Hong Kong and Guangzhou in the restaurants, the sale of shark cartilage soup boiled, known as "the old fire shark cartilage soup" , species diversity. These restaurants claim, this soup in addition to anti-cancer, anti-cancer effect, there is beauty, beauty, strong bones, make up the role of the spleen and stomach, the results go people are doing. Recent studies show that the shark itself would have cancer. Recent studies have shown that the shark itself would suffer from a variety of cancers, including cartilage cancer. Professor Gary Ostrander were identified in the report in its study, 40 out of the shark with tumors example, overturned on the shark is not long before the cancer claim. U.S. scientists also the United States John Haas Bagh 91st annual meeting of cancer that sharks are suffering from cancer. Haas is working in Bagh National Cancer Institute scholar, he found a cartilaginous fish are suffering from 50 different cancers, including 23 kinds of cancer is from a variety of sharks, some of them long in the cartilage directly. Is worth noting that, "Sharks never get cancer," Lance, author of Dr. William (he may be called "Shark Therapy," the father) has recently admitted that the shark would actually have cancer, and to the outside world Frankly he obtained the relevant extract of shark cartilage to treat cancer, the conclusion is only based on an extremely limited number of experimental results. Clinical experiments show that no cancer effect of shark cartilage powder. In fact, as of now, shark cartilage powder for anti-cancer effects in clinical trials prove null and void. Danish scholar submitted to the European Breast Cancer Conference study said they found that taking the shark cartilage tissue into the so-called "alternative anti-cancer drugs," the women did not get from any of the benefits of the drug. Danish researchers have used shark cartilage extracts on 17 patients suffering from advanced breast cancer were tested, to 17 patients a large dosage of shark liver oil capsules, daily doses of 24 satellites. Three months later, 17 patients, 15 were cancer continues to deteriorate. Another patient at first signs of a turnaround, but later found a new minister in the brain tumor. In addition, another clinical trial, more than 50 were breast cancer, lung cancer, prostate cancer, colorectal cancer and other patients in the use of purified shark cartilage protein, the disease has no obvious improvement. Moreover, according to U.S. National Institutes of Health studies have shown that, due to shark cartilage protein molecules too large to be easily absorbed in the intestine, even if absorbed, will be broken down damage. With shark cartilage in the name of healthy food, not for cancer treatment. Not long ago, the U.S. Drug and Food Control and Inspection Service lab son of William and manufacturer sued to stop propaganda "shark cartilage products for cancer," the unconfirmed false advertising. U.S. Federal Trade Commission also ruled that any ban on shark cartilage products, false propaganda, unless there is relevant scientific evidence. Lance Williams to pay lab fees $ 1,000,000 verdict, including $ 450,000 by the National Cancer Institute and Lance Williams to jointly hold the shark lab large clinical trials to identify the truth. Scientists believe that the various kinds of shark cartilage in the name of healthy food, there is no significant effect on cancer. Shark cancer is "for what to eat," saying that a new scientific replica. On second thoughts, even if the Sharks do not have to suffer from some kind of human cancer, can not therefore conclude that shark products to treat human cancer. For example, cats and horses do not have prostate cancer, research shows that eating cats and even horses can not prevent prostate cancer prostate. Moreover, is the president of cancer, shark, shark tried to eat the expensive anti-cancer bone meal to the consumer but also to think again. Medical experts believe that most of the advertised "anti-cancer" health food, selling nothing but "hope", the majority of consumers really need to look forward, should be the advancement of technology, rather than commercial advertising superstition.
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Sharks sleep
Previously, we have generally believed that sharks never sleep. Florida Museum of Natural History, according to records, white tip sharks, tiger sharks and great white sharks is to sleep, they sleep during the day, night out activities. Other species such as nurse shark through the holes, forcing the water through the gills, to provide a stable oxygen-rich water, so that they can breathe when stationary. Dominated swimming organs - test signal generator is located in the central spinal cord, it allows sharks to swim unconsciously. However, because fish do not eyelids, so I can not judge whether shark to sleep.
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Shark reproduction
And most animals, sharks are sexual reproduction. Shark mating behavior is very complex, different types of male and female sharks in the routine pre-mating also very different. Perfect mountain climbing, biting behavior and color changes are common. Sharks, basking sharks and other types of groups around the use of complex behavior, this behavior is not understood the purpose. Alligator shark oocyst spine, commonly known as "mermaid's purse." Mating success of male and female sharks, while the female shark's body after the egg to complete fertilization, this one is a shark's eggs will be in the following three ways to continue a certain kind of development: Oviparous shark birth to eggs with a thick sheath of the egg, enabling them to adhere to rocks or seaweed, and resistance to predators. The eggs hatch in a few days or weeks later, the shark will leave the pups to make them viable. Most egg cases was broad rectangle, there are some, such as dogfish birth of the "mermaid purse" is often rushed to the beach. Shark pups output, which in the female shark's uterus through the placenta or uterine fluid secretion called to obtain nutrition. Placental growth period to ensure the pups in the well bred, so immediately after birth to survive in the harsh sea. Shark conservation is also the body's embryo, and then outputs live pups, but they can not give them any direct descendants of nutrition. Instead, the shark gave birth to the egg yolk sac depends on subsistence. Certain types of shark, such as the mackerel sharks use "Aofo Ji (oophagy)" way, that is, output a string of small sharks mother's egg is not fertilized, the embryos are eaten by the growth. 1. Oviparous: the general use of large sharks. Big shark eggs, nutrient supply hard-pressed. Discharge of eggs wrapped in a flat pad-shaped sheath, while the cushion is egg-shaped sheath around the time through the fallopian tubes to go with the sheath of the skin will harden after entering the water, in every corner of the sheath has a short, hollow horns, the sea can thus enter, so the eggs get oxygen. Limited number of each ovulation. Egg-shaped or spiral bag was, after the fixed output coral reefs, sea plants or crevice. Shark washed up on shore empty oocysts spines were nicknamed "the little mermaid wallet." 2. Ovoviviparous (non-placental viviparous): egg development in the womb to the yolk sac or the uterus from the ovary into the source of eggs for nutrition, not the formation of the placenta in the uterus. In addition to the whale shark can produce 300 or more each time, the other end of each at most dozens, at least the Hu shark (thresher shark), each producing only two. 3. Viviparous (placental viviparous): Outsourcing horny shell eggs in the uterus in the development, growth nutrients from the yolk sac placenta need be, until the pups was almost fully formed production, each producing dozens of tail. The majority of ocean-going sharks are viviparous. Most sharks reproduce every year according to the season, a number of large sharks breed in alternate years. Most shark gestation period of 8 to 9 months pregnant spiny dogfish of even up to 24 months. In general, a large-scale production of more small sharks shark, small sharks and vice versa. Sharks are unusually slow growth until 5 to 10 years of age be considered sexually mature.
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Sharks Their Stories
Many different types of shark, the world's oceans at least 350 kinds. Sharks, known in ancient shark, shark shark, sharks, sea monster is, so-called "sea wolves." Sharks by nature carnivorous, ferocious, even the "king of the sea" whale saw it was back away. It was cruel prey of greed when the nature of people left a horrible image. So, speaking of sharks, people tend to be scared of feeling. Tiger shark catch food more than the higher one chip, it can take full advantage of its unique sense of smell to detect the direction and location of the food there, but Tiger is just looking for food with the eyes and nose. Strange smell under investigation and scientists estimate that the fossil, sharks living in the earth about 1.8 billion years, as early as 300 million years ago, it has existed so far not much has changed shape, indicating that its viability is extremely strong. But it is extremely violent character, no wonder there are more people to its prejudices, that it is so primitive and stupid benzene, in fact, the shark only has a highly developed brain, can navigate through electromagnetic fields, can the information stored in the center of the brain site, and can send information directly to the motor nerve system; and sensitive sense of smell with all the life-maintaining activities. Therefore, the sense of smell is very important for shark and magic more unpredictable. People know the unique teeth, sharks in the marine organisms has its many unique ecology. In addition to the sensitivity of its sense of smell and rarely get sick died, and the shark tooth structure is one of its unique ecological another. Those who are familiar with the shark's people know that it's teeth like a sharp knife, can be easily snapped like a finger-like cord. If the devil shark, has a long pointed snout and sharp teeth. Different types of shark, its teeth the size, shape and function almost never the same. Therefore, as long as the fish, scientists from the shark teeth shapes and sizes, we can determine that it is belong to which head, genus and family. Surprisingly, shark's teeth are not like other animals in the ocean as a row of constant solid, but with 5 to 6 rows, except the outer row of teeth is the real function of the teeth to play, the remaining rows are "sit" with the backup, just like each other, like tiles on the roof re-covered, once the outermost layer of the teeth in a fall occurs when a row in which the teeth will soon move to the front, to make up shedding teeth to replace the hole location. Meanwhile, the larger sharks in the growth process but also replacing the smaller teeth teeth. Hence, the sharks are often to be replaced in the life of tens of thousands of teeth. According to statistics, a shark, in 10 years, actually less than 2 million just to replace the teeth. It is not only strong and powerful teeth, and sharp. For example, some shark's teeth long benefits such as razors, it can be used to cut food; some jagged teeth formation, can be used to tear the food; there was flat mortar-like teeth, it can be used to crush food shell and bones and so on. Indians of North America as shark teeth as a shaving tool. But the frightening thing is that it take food off each other, the shark will often indiscriminate white, and even their own children - shark Aberdeen, also left off, eat spotless; when a shark by the accidental injury to other sharks struggling when the shark on the head injury luck, the other with the same clan would be surrounded and attacked the brothers, until the fully completed so far swallowed; there are even more horrible because it is viviparous shark, a child can produce 10 I shall shark Aberdeen, up to as many as 80 of these sharks in the womb, had to Aberdeen to kill each other, people have been found on the Atlantic coast in a tiger shark's stomach, came to this conclusion were dissected: the womb has become a battlefield, which is not seen in any animal precedent. The reason why replacement of shark teeth, not only with its ferocious brutality, into a sex-related killing, but also with its different-shaped teeth separated. Because sharks Yaoshi force can be said to all the animals in the ocean the most powerful. It has been a metal device hidden in the bait bite force in a body that measures 8 feet long shark Yaoshi force size, the pressure measured results show that the Yao Si up to 18 tons per square inch. So some merchant vessel in navigation has been recorded on the diary had been a shark bite ship propellers bent, shark bite a hole in the hull of the accident, which also is not a strange things. Very peculiar shape of shark teeth. For example, shark teeth, bite people with fine serrated edges, triangular; blue shark's teeth are large and sharp; and although the body of a huge whale shark, its teeth are short needle-; cone shark teeth are cone was and long, sharp; thresher shark teeth are flat, were angular; basking shark's teeth not only small and more like a grain of rice; tiger shark teeth were large mortar-like and so on. The reason why many shark teeth shapes, which like the above mentioned diet and its ecology is extremely closely related. In a sense, the body is a shark tooth, its surface covered with placoid scales and teeth structure is similar to the skin can be called teeth. There are a few hundred shark teeth, you can move, so do not worry about shark teeth is not enough, so they have a great attack. Jaws is by far the most powerful ocean sharks, with a strong tooth rule the roost.
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Why be afraid of sharks, fish, and sharks afraid of dolphins?
Fish fear of sharks, but sharks afraid of dolphins. Together groups of dolphins, sharks organized siege, took turns with a strong nose, hit the shark hit the side of the body department. Because shark bone is soft and protective organs have the ability, intelligent dolphins seize the crucial point, desperately impact, do not let it break a sweat until the internal organs of the shark crashed so far, tend to surround and annihilate the shark in a war quickly killed.
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Shark electric sensor
Sharks can detect the head has a special cell current network system, known as the power sensor. Receptors on the use of electronic shark to prey and the freedom of cruising in the water. U.S. researchers spotted cat shark of the small embryos were studied. By molecular tests, they receptors in the shark's electric neural crest cells were found in two independent genetic markers. Neural crest cells are formed early embryonic development of the embryonic cells of various tissues. Human neural crest cells of human facial bones and teeth play an important role in the formation. This finding shows that neural crest cells from the brains of sharks in all regions to move its head, and head of development for the power in their receptors.
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Introduction
Shark Pinyin: shā yú English name: shark (s) Sharks back in three hundred million years before dinosaurs appeared on Earth has existed, has been more than four hundred million years, they are nearly a million years to almost no change. There are several sharks in the world? About 380 species of sharks. About 27 species will attack humans, there are 12 possible to attack humans, there are 27 species because of the relationship between body size and habits may be dangerous. Shark's skeleton All sharks have a cartilage. Shark's skeleton is cartilage, not by the bone composition. Lighter than the bones, cartilage and more flexible. Shark are all sharks are the key link, and shark cartilage outline animals have. What size of sharks? Shark's body varies in length as small as 6 inches, as large as 18 meters. Whale sharks are the biggest fish in the sea, grow up to 60 feet in length after. Although the whale shark's large size, its teeth in the shark is the smallest. The smallest is the dwarf dogfish shark, small enough to be on hand. It is about 6 to 8 inches, weighs less than a pound. * The world's largest fish is the whale shark. It can be up to 18 meters, weighs 40,000 kilograms. Fortunately, their food is plankton, otherwise, humans will have difficult! According to Australian sharks and shark experts to the long life of the sea, shark is motionless in the sea, and will not be stifled. Sharks and bony fish, the difference is, they have no swim bladder to control the snorkeling. If you stop swimming, most of the sharks to sink. To increase the buoyancy in the water, shark's liver with a lot of oil. Shark In addition to the five human senses, as well as other organs. Sharks are the most sensitive organ of smell, they can smell blood a few miles away and a very fine material, and to track the source. They also have a sixth sense ---- sense of power, this ability sharks can detect objects through several feet around the weak electric field. They can also feel the effects through mechanical, feel 6 hundred feet outside the fish or animals caused by vibration. Shark life of thousands of teeth in need of replacement. * Shark teeth * Many sharks including great white shark mouth has rows of teeth. As long as the front teeth caused by the consumption off the rear of the tooth will be filled. Teeth than the old new larger and more durable teeth. The dogfish shark and spiny dogfish sharks will replace the whole row of teeth. Serrated shark teeth, this way, not only just bite the prey of sharks, but also saw them effectively broken. Great white shark's jaws and head did not closely linked. Not as great white shark's jaws and head are closely linked, it can be extended to palate up and forward to swallow the prey, and sometimes even able to swallow prey. Become a staple of the seals shark Sharks mostly carrion. Sharks to the injured marine mammals, fish and carrion, remove the weaker members of the animal. Sharks will eat garbage thrown on board, and other waste. In addition, some sharks can also hunt a variety of marine mammals, fish and turtles and crabs and other animals. Some sharks can be a few months without eating, great white shark is one of them. According to reports, great white shark to every one to two months before eating again. Jaws is a good camouflage predators. Huge great white shark because the body is not as flexible as other sharks. But the great white shark is an excellent hunter, because it can always surprise. Its color is very dark upper body, lower body is very bright, they can camouflage by quietly approaching this game. When it is struck from below, because of its color and deep-sea close to eat until it attacks only to be found. It rarely attacks from above, but it struck from the top, the white reflects the lower side of the bright sky and sea blend. Sharks, known in ancient shark, shark shark, sharks, sea monster is, so-called "sea wolves." Shark's nose in front of the head ventral mouth, and some communication with the nose and mouth, the connection between the nose and mouth corner, the fold increase in olfactory capsule with the external environment of the contact area. Sharks are cartilaginous fish, they do not have swim bladders to regulate the ups and downs mainly relied on a large liver. According to survey and scientists estimate that the fossil, sharks living in the earth about 1.8 billion years, as early as 300 million years ago, it has existed so far not much has changed shape, indicating the viability of its strong, known as the Ocean "hunter" . Great whites are most likely to attack humans ocean sharks.
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Classification of Sharks
Chordates door, vertebrate subphylum, Pisces, cartilage Pisces, elasmobranch subclass, Head side holes According to the 1971 classification system down into Las To be of the order Cetacea: breast-feeding a target. Six-gill shark head: 1 head cartilage Pisces. Only six-gill shark Division 1 Section 3 is about 4 species. China 3 3 species. Structure of the original. Gill opening 6 to 7. Eyes without nictitating membrane or instant fold. A water hole. 1 dorsal fin, no spines, posterior, with anal; pectoral fins of the axial skeleton extending up to the leading edge, the first non-radial rays fin cartilage. Spine section is not complete, but the number of calcified vertebrae, spinal cord or constricted part. Kiss cartilage 1. Large white sharks body weight, crescent-shaped tail, big teeth and a serrated edge, triangular in shape. Its danger lies in its body possessed a large offensive. The specimen weight 3,300 kg (7,300 lbs), body length of 6.4 meters (21 feet). Most about shark length up to 11 meters (36 feet). The general body of gray, light blue or light brown, abdomen pale white, demarcated dorsal and ventral body color, body size is greater paler. Reputation enjoyed by the great white shark and the Wal-Mart unique. As one of large marine predators, great white shark has a unique color of ice, dark eyes, ferocious teeth and jaws, which not only make it the world's most easily recognizable of sharks, but also make it extremely decades cover with decorative "character." Great white shark is one of the most widely distributed, it is because it has an unusual ability, it can hold above the ambient temperature of the body, which it in very cold seawater can also be agreeable to survive. Although it is difficult to see it in most coastal areas, but the fishing and diving boats often ran into with it. Tiger Shark Head: Pisces elasmobranch cartilage subclass of a project. 1 genus only 1 of 8. Body thick and short, almost square head high. Kiss blunt, eyes small, oval, on the lateral. Nostril with a muzzle ditch. Ping Wang mouth, on the lower lip folds developed. Maxillary and mandibular teeth of the same type, each jaw before and after the teeth shaped, thin sharp front teeth, the first 3 to 5 teeth; rear flat flat teeth, molar-like. Spiracle small, situated below the eye. Sharks Head: 1 Head of cartilage Pisces. 2 dorsal fins, without spines. With anal fin. 5 gill openings. Tongue jaw connection type. Kiss cartilage 3. Eyes have instant fold or haw. Vertebral region with radial calcification, 4 spokes without calcification calcified region invaded. Intestinal valve of spiral or scroll-shaped spiral. The world total of 4 sub-orders and 7 families and 49 genera of more than 200 species. China has four sub-orders, 4 families 23 genera 60 species of cartilaginous fish is the largest one species group. Dogfish Head: Cartilage Pisces elasmobranch subclass of a project. There are 3 families and 21 genera 87. 2 dorsal fins, with or without spines; anal disappear. Gill opening 5, vertebral ring or ring. Kiss cartilage 1. Mainly distributed in the world warm, cold or deep waters. Saw Shark Head: Cartilage Pisces elasmobranch subclass of a head, the head only saw sharks Division 1 Division 2 genera and 5 species, China is only 1 species. Flat Shark Head: 1 Head of cartilage Pisces, the flat head shark families only 1 family, 1 genus of about 13 species are flat shark. Flat flat body; kiss was short and wide; large pectoral fins extending to the cephalic and free as Paoxiu, which formerly sleeve shark, commonly known as the West or monk fish, angel fish; eye position; mouth wide, sub-anterior; teeth, the jaw of the same type , slender single-tooth head type; nostrils anterior; gill opening 5, large, extending to the belly; dorsal fin 2, no spines. Must shark Head: is elasmobranch subclass, sub-spot tip sharks Branch, Long Branch to be sharks, sharks must Branch, thresher shark to be Branch, Division hinge port to be sharks, leopard sharks and whale sharks Branch Division. Sharks, considered by some the most ferocious of marine animals. Whale shark with small marine life for food, and baleen whales almost. As the food has a certain similarity, the long period of evolution, they look very similar to the point, and baleen whales, this is called "convergent evolution." So "whale shark" the name for granted. Of course, the whale shark is the largest existing, but also the largest known fish. Sharks need to protect our delicious shark's fin soup on the table is the shark's dorsal fin to do, once deprive the dorsal fin of sharks because of the loss of balance would sink to the bottom die of starvation.
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Shark electric sensor
Sharks can detect the head has a special cell current network system, known as the power sensor. Receptors on the use of electronic shark to prey and the freedom of cruising in the water. U.S. researchers spotted cat shark of the small embryos were studied. By molecular tests, they receptors in the shark's electric neural crest cells were found in two independent genetic markers. Neural crest cells are formed early embryonic development of the embryonic cells of various tissues. Human neural crest cells of human facial bones and teeth play an important role in the formation. This finding shows that neural crest cells from the brains of sharks in all regions to move its head, and head of development for the power in their receptors. There are taste and touch a shark, in addition, they also have two special feeling, one is next to the line of the nervous system, which is a row of nerve endings, located on both sides of the body. Perception of the water he can make any shark activity. Another special feeling that can detect subtle charge issued by other organisms. Lenz called off the ampulla.
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Therapeutic value
Shark species can wrinkle or gray-white star star shark and other shark meat. Shark shark, also known as fish, sand fish, abalone fish. Located in the East China Sea, South China Sea, Yellow Sea and other waters. Obtained, the first scalded with boiling water before, remove odor, after the knife Guapi, eviscerated, washed, take meat. [Performance] Sweet, flat. Will supplement the spleen and stomach, benefit qi and blood. [Reference] containing protein, fat, a variety of inorganic salts, vitamins and other ingredients. [Use] for malnutrition, lack of blood, wound or sore long-suppressed healing. [Usage] fry food, or cooking. [With square] Fresh fried shark meat: shark meat 250g, sliced, with oil and salt, vinegar amount of fried cooked food. The Sharks side to take the role of nutritional benefit to growth in human blood and promote wound healing. Tune up for post-operative long-suppressed healing of the sick or sore. Three wire skin Ingredients: 400 grams of water, fat skin, red pepper 1, 1 green pepper, 1 yellow pepper, 1 clove garlic Seasoning: 2 tsp sesame oil, mustard oil amount, cooking wine 1 tablespoon pepper 1 tsp salt 1 tsp MSG 1 / 2 tsp Three wire shark skin 1, skin, washed and shredded pepper; garlic slices; parsley washed and cut into sections; 2, into the fish bowl Pisi, garlic, chili, add all the spices and mix well, transfer to a plate.
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Sharks Their Stories
Many different types of shark, the world's oceans at least 350 kinds. Sharks, known in ancient shark, shark shark, sharks, sea monster is, so-called "sea wolves." Sharks by nature carnivorous, ferocious, even the "king of the sea" whale saw it was back away. It was cruel prey of greed when the nature of people left a horrible image. So, speaking of sharks, people tend to be scared of feeling. Tiger shark catch food more than the higher one chip, it can take full advantage of its unique sense of smell to detect the direction and location of the food there, but Tiger is just looking for food with the eyes and nose. Strange smell under investigation and scientists estimate that the fossil, sharks living in the earth about 1.8 billion years, as early as 300 million years ago, it has existed so far not much has changed shape, indicating that its viability is extremely strong. But it is extremely violent character, no wonder there are more people to its prejudices, that it is so primitive and stupid benzene, in fact, the shark only has a highly developed brain, can navigate through electromagnetic fields, can the information stored in the center of the brain site, and can send information directly to the motor nerve system; and sensitive sense of smell with all the life-maintaining activities. Therefore, the sense of smell is very important for shark and magic more unpredictable. People know the unique teeth, sharks in the marine organisms has its many unique ecology. In addition to the sensitivity of its sense of smell and rarely get sick died, and the shark tooth structure is one of its unique ecological another. Those who are familiar with the shark's people know that it's teeth like a sharp knife, can be easily snapped like a finger-like cord. If the devil shark, has a long pointed snout and sharp teeth. Different types of shark, its teeth the size, shape and function almost never the same. Therefore, as long as the fish, scientists from the shark teeth shapes and sizes, we can determine that it is belong to which head, genus and family. Surprisingly, shark's teeth are not like other animals in the ocean as a row of constant solid, but with 5 to 6 rows, except the outer row of teeth is the real function of the teeth to play, the remaining rows are "sit" with the backup, just like each other, like tiles on the roof re-covered, once the outermost layer of the teeth in a fall occurs when a row in which the teeth will soon move to the front, to make up shedding teeth to replace the hole location. Meanwhile, the larger sharks in the growth process but also replacing the smaller teeth teeth. Hence, the sharks are often to be replaced in the life of tens of thousands of teeth. According to statistics, a shark, in 10 years, actually less than 2 million just to replace the teeth. It is not only strong and powerful teeth, and sharp. For example, some shark's teeth long benefits such as razors, it can be used to cut food; some jagged teeth formation, can be used to tear the food; there was flat mortar-like teeth, it can be used to crush food shell and bones and so on. Indians of North America as shark teeth as a shaving tool. But the frightening thing is that it take food off each other, the shark will often indiscriminate white, and even their own children - shark Aberdeen, also left off, eat spotless; when a shark by the accidental injury to other sharks struggling when the shark on the head injury luck, the other with the same clan would be surrounded and attacked the brothers, until the fully completed so far swallowed; there are even more horrible because it is viviparous shark, a child can produce 10 I shall shark Aberdeen, up to as many as 80 of these sharks in the womb, had to Aberdeen to kill each other, people have been found on the Atlantic coast in a tiger shark's stomach, came to this conclusion were dissected: the womb has become a battlefield, which is not seen in any animal precedent. The reason why replacement of shark teeth, not only with its ferocious brutality, into a sex-related killing, but also with its different-shaped teeth separated. Because sharks Yaoshi force can be said to all the animals in the ocean the most powerful. It has been a metal device hidden in the bait bite force in a body that measures 8 feet long shark Yaoshi force size, the pressure measured results show that the Yao Si up to 18 tons per square inch. So some merchant vessel in navigation has been recorded on the diary had been a shark bite ship propellers bent, shark bite a hole in the hull of the accident, which also is not a strange things. Very peculiar shape of shark teeth. For example, shark teeth, bite people with fine serrated edges, triangular; blue shark's teeth are large and sharp; and although the body of a huge whale shark, its teeth are short needle-; cone shark teeth are cone was and long, sharp; thresher shark teeth are flat, were angular; basking shark's teeth not only small and more like a grain of rice; tiger shark teeth were large mortar-like and so on. The reason why many shark teeth shapes, which like the above mentioned diet and its ecology is extremely closely related. In a sense, the body is a shark tooth, its surface covered with placoid scales and teeth structure is similar to the skin can be called teeth. There are a few hundred shark teeth, you can move, so do not worry about shark teeth is not enough, so they have a great attack. Jaws is by far the most powerful ocean sharks, with a strong tooth rule the roost. The end of the ditch, or sea spray flashing in the marine world of sharks are always gathered. Has been named the shark had 315 species, but the new sharks continue to be discovered. In size, large enough to make a living plankton in the whale shark by bus into a dwarf, dwarf pygmy shark gill not much greater than your phone. Fossil records indicate that the ancestors of sharks, sea 400 million years have been wandering around, apparently even than the dinosaurs long ago. They are the living areas of the King; the perfect body structure and adapt to a variety of hunting techniques to ensure that their marine environment. Their aerodynamic body covered with highly sensitive nerve endings, is conducive to easily and efficiently find and capture prey. They can sniff out the smell of blood, 4 km away. Even in the dim light, their vision is still outstanding, in addition they also have this as the natural magic of Lorentz ampulla. Gelatinous shark snout all around the catheter, to collect all living the electric pulses. A variety of shapes and sizes of sharks, they are good at taking advantage of this design evolution of prey. Flat shape of an angel shark, a perfect master of disguise, hidden in between the sea bed, waiting for a peek into the prey. The strange twist of hammerhead sharks, afraid I can only be seen in the sci-fi movie, but their eyes wide field of vision will undoubtedly enhance the beneficial predators. The most frightening shark to calculate the Dharma shark cigar shaped Brazil. Although the size is only kitten so small, but it dared to attack, like dolphins and large tuna prey, weapons that rely on strong jaw bite prey, abruptly pulled meat. Sometimes, it can not release the teeth bite too deep, the results had to terrestrial prey, swallow his flesh. Hey - Who let the animals each have their own food chain off the assembly line had to do. Let us return to the 20th century, 70s, night sensation, "the gate of hell," evoked the world of the particular species - great white panic. However, the little-known blue shark movie star than its "cousin" killed more humans. Few blue sharks are able to adapt to fresh water and the sharks cruising inland Hanoi. They often ambush in the dark waters, attacking and killing the local fishing or swimming along the river people. Human fascination with sharks, sometimes they mistakenly believe that stupid serial killer, perennial marine cruising, eating any moving objects. The fact that most shark attacks only after they give to human disturbance response, and countless attacks on the world, only a tiny percentage are fatal. In the U.S., according to statistics drowning in soda machines far exceeds the number of shark attacks; frustrated customers often beat soda machine, the results of the user that they knocked down a rebound. Shark called very healthy animals. It is this abundant energy, but also make it a place in the current scientific research. Scientists have been investigating why they are the lowest cancer rates in nature species. At the same time, they wound healing ability to self-best in the world. Perhaps we can learn more from shark physiology will change the future of the important knowledge of human health.
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Celebrity pseudonym
IT blogger shark (tomorrow), who led 20 person team engaged in a community, after engaging in casual games to do marketing, then engaged in the online gaming industry, is currently in a start-up companies. Currently Ereli experts, invited observers to Analysys International, PRNewswire-line experts, Sina millions of blog club members, CCID expert blogger, TechWeb guest blogger. Profound understanding of the unique issues and Bifeng sharp, quick thinking. Popular events are good at using marketing to reduce marketing costs.
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An encryption password
In cryptography, where, SHARK is considered a Rijndael encryption (Advanced Encryption Standard), formerly of the block cipher. SHARK has a 64-bit block size and 128-bit key length. It is a 6 cycles of SP networks, linear and nonlinear conversion layer rotation of the key mixing stage. MDS matrix represents a linear transformation using the Reed-Solomon error correcting code to ensure the appropriate scattered. Layer is a nonlinear function of 8 from F (x) = x in GF (2) (limited domain 2 to the 8th power) of the 8 × 8 位元 S-box composition. 5 SHARK modified version cycles through interpolation attack (Jakobsen and Knudsen, 1997) to crack. Developer: Vincent Rijmen, Joan Daemen, Bart Preneel, Antoon Bosselaers, Erik De Win came first published: 1996 inheritance theory: KHAZAD, Rijndael password length: 128-bit block size: 64-bit Structure: The combination of network round replacement : 6
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Introduction of species
Sharks back in three hundred million years before dinosaurs appeared on Earth has existed, has been more than four hundred million years, they are nearly a million years to almost no change. Sharks, known in ancient shark, shark shark, sharks, sea monster is, so-called "sea wolves." Sharks, considered by some the most ferocious of marine animals. Whale shark with small marine life for food, and baleen whales almost. As the food has a certain similarity, the long period of evolution, they look very similar to the point, and baleen whales, the great white shark is called "convergent evolution." So "whale shark" the name for granted. Of course, the whale shark is the largest existing, but also the largest known fish. Sharks need to protect our delicious shark's fin soup on the table is the shark's dorsal fin to do, once deprive the dorsal fin of sharks because of the loss of balance would sink to the bottom die of starvation. About 380 species of sharks in the world. Approximately 30 people will take the initiative to attack, there are 7 may cause death, there are 27 species because of the relationship between body size and habits, are dangerous. According to survey and scientists estimate that the fossil, sharks living in the earth about 1.8 billion years, as early as 300 million years ago, it has existed so far not much has changed shape, indicating the viability of its strong, known as the Ocean "hunter" . Jaws is the shape of the ocean to attack the largest carnivorous shark.
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Shape features
Skeleton All sharks have a cartilage. Shark's skeleton is cartilage, not by the bone composition. Lighter than the bones, cartilage and more flexible. Shark are all sharks are the key link, and shark cartilage outline animals have. Body type Shark's body varies in length as small as 6 inches, as large as 18 meters. Whale sharks are the largest shark in the sea, grow up to 60 feet in length after. Although the whale shark's large size, its teeth in the shark is the smallest. The smallest is the dwarf dogfish shark, small enough to be on hand. It is about 6 to 8 inches, weighs less than a pound. * The world's largest fish is the whale shark. It can be up to 18 meters, weighs 40,000 kilograms. Fortunately, their food is plankton, otherwise, humans will have difficult! According to Australian sharks and shark experts to the long life of the sea, shark is motionless in the sea, and will not be stifled. Sharks and bony fish, the difference is, they have no swim bladder to control the snorkeling. If you stop swimming, most of the sharks to sink. To increase the buoyancy in the water, shark's liver with a lot of oil. Organ Shark In addition to the five human senses, as well as other organs. Sharks are the most sensitive organ of smell, they can smell blood a few miles away and a very fine material, and to track the source. They also have a sixth sense ---- sense of power, this ability sharks can detect objects through several feet around the weak electric field. They can also feel the effects through mechanical, feel 6 hundred feet outside the fish or animals caused by vibration. Sharks can detect the head has a special cell current network system, known as the power sensor. Receptors on the use of electronic shark to prey and the freedom of cruising in the water. U.S. researchers spotted cat shark of the small embryos were studied. By molecular tests, they receptors in the shark's electric neural crest cells were found in two independent genetic markers. Neural crest cells are formed early embryonic development of the embryonic cells of various tissues. Human neural crest cells of human facial bones and teeth play an important role in the formation. This finding shows that neural crest cells from the brains of sharks in all regions to move its head, and head of development for the power in their receptors. As the shark's sense of smell is very sensitive, very easy to sniff out the smell of their fear or disgust. Concentration in seawater of 800 billionths of a human body secretions - hydroxy-L-alanine of the smell, sharks can smell it. It is said that there was a shark fishing experts, among them shark fishing in the later, the shark is not always on his hook, while at the same fishing grounds instead of the other fishermen catch sharks and more. Why afraid of the shark fishing shark experts it? The scientists found that fish, shark fishing experts who have skin too, so leave fingerprints on the rod containing this L-hydroxy-alanine is more abundant. Sharks smell this smell, his nature to back down, do not bait the truth in this for. There are taste and touch a shark, in addition, they also have two special feeling, one is next to the line of the nervous system, which is a row of nerve endings, located on both sides of the body. Perception of the water he can make any shark activity. Another special feeling that can detect subtle charge issued by other organisms. Lenz called off the ampulla. Sharks body hard, muscular, to varying degrees was spindle. Nose and mouth in part by the type of difference: a sharp, such as mako shark and great white sharks; also have large, round, such as tiger sharks and tiger shark's head was wide and flat. Upright tail (caudal fin), roughly crescent, most types are far greater than the lower part of the upper caudal fin. University of Hawaii marine biologists said they had received a first-hand evidence that sharks can detect changes to the Earth's magnetic field. This discovery proves the existence of a marine fish stocks within the "Compass" system to guide their direction to provide a new example. This latest study, published in the UK on the Royal Academy of Sciences. University of Hawaii marine biologists - Karl Meyer and his colleagues planned the design of the trial. Them in an artificial magnetic field environment, training six sandbar sharks and a hammerhead shark. The artificial magnetic field environment is the sinks with a diameter of 7 meters, the external wound with a layer of copper cable, when put to the sink in the food, the cable switch to simulate the magnetic field will be open. After six weeks of training, regardless of the cable when the switch opens, even if no food to put in the tank, the shark will still flock to normal feeding area. This reaction proved they feel the presence of the magnetic field. For this test before the scientists, some of the habits of sharks have been so strange to shark scientists speculate may have this special ability. Tiger sharks, blue sharks in the ocean Zhong You can go straight to a very long distance, if only relying on the sense of smell is impossible. Hammerhead are often assembled in the mountains near the sea, and these mountains are changing Earth's magnetic field zone. Scientists study the next step is to figure out how to identify the Earth's magnetic field sharks and their degree of sensitivity for the magnetic induction. Not long ago, scientists have recognized the other animals also have the ability to identify the magnetic field. North Carolina State University researchers proved by experiment, pigeons on the beak with tiny magnetic particles that can help complete the long-distance flight pigeons. Many people think that sharks are bad, has been attacking humans, in fact, a very timid shark, it will attack the human reason is because we humans broke into the shark's site, will attack us. Swimming Shark swimming depends mainly on the body, like a snake with the tail fin movement and swing the same as oars to move forward. Stability and control are mainly based on the number of some vertical and horizontal scheduling of pectoral fin. Most sharks can not be regressive, so it is easy to fall into obstacles such as gill nets, but also a difficult to extricate themselves into. Sharks do not swim bladder, so the proportion of these animals mainly by the liver to determine the amount of stored fat. Sharks slightly larger density than water, that is, if they do not actively swimming, they sink to the seabed. They swim very fast, but only to maintain high speed in a short time. Sharks have 5 to 7 on each side of gill slits (like we usually buy the carp from the market, there is a patrol gill gill cover), swimming in the sea when inhaled through the mouth half open, out from the gill gas exchange. The mouth of a shark swimming Zhang looks really terrible, but you can not let people breathe? A small number of shark species can be stopped at sea to breathe. Teeth Shark life of thousands of teeth in need of replacement. Many sharks including great white shark mouth has rows of teeth. As long as the front teeth caused by the consumption off the rear of the tooth will be filled. Teeth than the old new larger and more durable teeth. The dogfish shark and spiny dogfish sharks will replace the whole row of teeth. Serrated shark teeth, this way, not only just bite the prey of sharks, but also saw them effectively broken. Great white shark's jaws and head did not closely linked. Not as great white shark's jaws and head are closely linked, it can be extended to palate up and forward to swallow the prey, and sometimes even able to swallow prey. Shark's tooth structure is one of its unique ecological another. Those who are familiar with the shark's people know that it's teeth like a sharp knife, can be easily snapped like a finger-like cord. If the devil shark, has a long pointed snout and sharp teeth. Different types of shark, its teeth the size, shape and function almost never the same. Therefore, as long as the fish, scientists from the shark teeth shapes and sizes, we can determine that it is belong to which head, genus and family. Surprisingly, shark's teeth are not like other animals in the ocean as a row of constant solid, but with 5 to 6 rows, except the outer row of teeth is the real function of the teeth to play, the remaining rows are "sit" with the backup, just like each other, like tiles on the roof re-covered, once the outermost layer of the teeth in a fall occurs when a row in which the teeth will soon move to the front, to make up shedding teeth to replace the hole location. Meanwhile, the larger sharks in the growth process but also replacing the smaller teeth teeth. Hence, the sharks are often to be replaced in the life of tens of thousands of teeth. According to statistics, a shark, in 10 years, actually less than 2 million just to replace the teeth. It is not only strong and powerful teeth, and sharp. For example, some shark's teeth long benefits such as razors, it can be used to cut food; some jagged teeth formation, can be used to tear the food; there was flat mortar-like teeth, it can be used to crush food shell and bones and so on. Indians of North America as shark teeth as a shaving tool. But the frightening thing is that it take food off each other, the shark will often indiscriminate white, and even their own children - shark Aberdeen, also left off, eat spotless; when a shark by the accidental injury to other sharks struggling when the shark on the head injury luck, the other with the same clan would be surrounded and attacked the brothers, until the fully completed so far swallowed; there are even more horrible because it is viviparous shark, a child can produce 10 I shall shark Aberdeen, up to as many as 80 of these sharks in the womb, had to Aberdeen to kill each other, people have been found on the Atlantic coast in a tiger shark's stomach, came to this conclusion were dissected: the womb has become a battlefield, which is not seen in any animal precedent. The reason why replacement of shark teeth, not only with its ferocious brutality, into a sex-related killing, but also with its different-shaped teeth separated. Because sharks Yaoshi force can be said to all the animals in the ocean the most powerful. It has been a metal device hidden in the bait bite force in a body that measures 8 feet long shark Yaoshi force size, the pressure measured results show that the Yao Si up to 18 tons per square inch. So some merchant vessel in navigation has been recorded on the diary had been a shark bite ship propellers bent, shark bite a hole in the hull of the accident, which also is not a strange things. Very peculiar shape of shark teeth. For example, shark teeth, bite people with fine serrated edges, triangular; blue shark's teeth are large and sharp; and although the body of a huge whale shark, its teeth are short needle-; cone shark teeth are cone was and long, sharp; thresher shark teeth are flat, were angular; basking shark's teeth not only small and more like a grain of rice; tiger shark teeth were large mortar-like and so on. The reason why many shark teeth shapes, which like the above mentioned diet and its ecology is extremely closely related. In a sense, the body is a shark tooth, its surface covered with placoid scales and teeth structure is similar to the skin can be called teeth. There are a few hundred shark teeth, you can move, so do not worry about shark teeth is not enough, so they have a great attack. Jaws is by far the most powerful ocean sharks, with a strong tooth rule the roost.
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Habits
Eating Most of a shark feeding on fish and other marine animals Sharks to the injured marine mammals, fish and carrion, remove the weaker members of the animal. Sharks will eat garbage thrown on board, and other waste. In addition, some sharks can also hunt a variety of marine mammals, fish and turtles and crabs and other animals. Some sharks can be a few months without eating, great white shark is one of them. According to reports, great white shark to every one to two months before eating again. Jaws is a good camouflage predators. Huge great white shark because the body is not as flexible as other sharks. But the great white shark is an excellent hunter, because it can always surprise. Its color is very dark upper body, lower body is very bright, they can camouflage by quietly approaching this game. When it is struck from below, because of its color and deep-sea close to eat until it attacks only to be found. It rarely attacks from above, but it struck from the top, the white reflects the lower side of the bright sky and sea blend. Sharks, known in ancient shark, shark shark, sharks, sea monster is, so-called "sea wolves." Shark's nose in front of the head ventral mouth, and some communication with the nose and mouth, the connection between the nose and mouth corner, the fold increase in olfactory capsule with the external environment of the contact area. Sharks are cartilaginous fish, they do not have swim bladders to regulate the ups and downs mainly relied on a large liver. Sleep Previously, we have generally believed that sharks never sleep. Florida Museum of Natural History, according to records, white tip sharks, tiger sharks and great white sharks is to sleep, they sleep during the day, night out activities. Other species such as nurse shark through the holes, forcing the water through the gills, to provide a stable oxygen-rich water, so that they can breathe when stationary. Dominated swimming organs - test signal generator is located in the central spinal cord, it allows sharks to swim unconsciously. However, because fish do not eyelids, so I can not judge whether shark to sleep.
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Population Category
Many different types of shark, the world's marine species of shark can tell there are at least 344 [1]. According to the 1971 classification system down into Las To be of the order Cetacea (Orectolobiformes): breast-feeding a target. Six-gill shark head (Hexanchiformes): 1 head cartilage Pisces. Only six-gill shark Division 1 Section 3 is about 4 species. China 3 3 species. Structure of the original. Gill opening 6 to 7. Eyes without nictitating membrane or instant fold. A water hole. 1 dorsal fin, no spines, posterior, with anal; pectoral fins of the axial skeleton extending up to the leading edge, the first non-radial rays fin cartilage. Spine section is not complete, but the number of calcified vertebrae, spinal cord or constricted part. Kiss cartilage 1. Large white sharks body weight, crescent-shaped tail, big teeth and a serrated edge, triangular in shape. Its danger lies in its body possessed a large offensive. The specimen weight 3,300 kg (7,300 lbs), body length of 6.4 meters (21 feet). Most about shark length up to 11 meters (36 feet). The general body of gray, light blue or light brown, abdomen pale white, demarcated dorsal and ventral body color, body size is greater paler. Reputation enjoyed by the great white shark and the Wal-Mart unique. As one of large marine predators, great white shark has a unique color of ice, dark eyes, ferocious teeth and jaws, which not only make it the world's most easily recognizable of sharks, but also make it extremely decades cover with decorative "character." Great white shark is one of the most widely distributed, it is because it has an unusual ability, it can hold above the ambient temperature of the body, which it in very cold seawater can also be agreeable to survive. Although it is difficult to see it in most coastal areas, but the fishing and diving boats often ran into with it. Tiger Shark Head (Heterodontiformes): Pisces elasmobranch cartilage subclass of a project. 1 genus only 1 of 8. Body thick and short, almost square head high. Kiss blunt, eyes small, oval, on the lateral. Nostril with a muzzle ditch. Ping Wang mouth, on the lower lip folds developed. Maxillary and mandibular teeth of the same type, each jaw before and after the teeth shaped, thin sharp front teeth, the first 3 to 5 teeth; rear flat flat teeth, molar-like. Spiracle small, situated below the eye. Sharks head (Squaliformes): 1 head cartilage Pisces. 2 dorsal fins, without spines. With anal fin. 5 gill openings. Tongue jaw connection type. Kiss cartilage 3. Eyes have instant fold or haw. Vertebral region with radial calcification, 4 spokes without calcification calcified region invaded. Intestinal valve of spiral or scroll-shaped spiral. The world total of 4 sub-orders and 7 families and 49 genera of more than 200 species. China has four sub-orders, 4 families 23 genera 60 species of cartilaginous fish is the largest one species group. Dogfish Head (Squaliformes): cartilage Pisces elasmobranch subclass of a project. There are 3 families and 21 genera 87. 2 dorsal fins, with or without spines; anal disappear. Gill opening 5, vertebral ring or ring. Kiss cartilage 1. Mainly distributed in the world warm, cold or deep waters. Saw shark head (Pristiophoriformes): Pisces elasmobranch cartilage subclass 1 head, the head only saw sharks Division 1 Division 2 genera and 5 species, China is only 1 species. Flat head shark (Squatiniformes): 1 head cartilage Pisces, the flat head shark families only 1 family, 1 genus of about 13 species are flat shark. Flat flat body; kiss was short and wide; large pectoral fins extending to the cephalic and free as Paoxiu, which formerly sleeve shark, commonly known as the West or monk fish, angel fish; eye position; mouth wide, sub-anterior; teeth, the jaw of the same type , slender single-tooth head type; nostrils anterior; gill opening 5, large, extending to the belly; dorsal fin 2, no spines. Projects to be shark (Orectolobiformes): belonging to elasmobranch subclass, sub-spotted shark Branch, Long Branch to be sharks, sharks must Branch, thresher shark to be Branch, Division hinge port to be sharks, leopard sharks and whale sharks Branch Division.
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Growth and reproduction
And most animals, sharks are sexual reproduction. Shark mating behavior is very complex, different types of male and female sharks in the routine pre-mating also very different. Perfect mountain climbing, biting behavior and color changes are common. Sharks, basking sharks and other types of groups around the use of complex behavior, this behavior is not understood the purpose. Alligator shark oocyst spine, commonly known as "mermaid's purse." Mating success of male and female sharks, while the female shark's body after the egg to complete fertilization, this one is a shark's eggs will be in the following three ways to continue a certain kind of development: Oviparous shark birth to eggs with a thick sheath of the egg, enabling them to adhere to rocks or seaweed, and resistance to predators. The eggs hatch in a few days or weeks later, the shark will leave the pups to make them viable. Most egg cases was broad rectangle, there are some, such as dogfish birth of the "mermaid purse" is often rushed to the beach. Shark pups output, which in the female shark's uterus through the placenta or uterine fluid secretion called to obtain nutrition. Placental growth period to ensure the pups in the well bred, so immediately after birth to survive in the harsh sea. Shark conservation is also the body's embryo, and then outputs live pups, but they can not give them any direct descendants of nutrition. Instead, the shark gave birth to the egg yolk sac depends on subsistence. Certain types of shark, such as the mackerel sharks use "Aofo Ji (oophagy)" way, that is, output a string of small sharks mother's egg is not fertilized, the embryos are eaten by the growth. 1. Oviparous: the general use of large sharks. Big shark eggs, nutrient supply hard-pressed. Discharge of eggs wrapped in a flat pad-shaped sheath, while the cushion is egg-shaped sheath around the time through the fallopian tubes to go with the sheath of the skin will harden after entering the water, in every corner of the sheath has a short, hollow horns, the sea can thus enter, so the eggs get oxygen. Limited number of each ovulation. Egg-shaped or spiral bag was, after the fixed output coral reefs, sea plants or crevice. Shark washed up on shore empty oocysts spines were nicknamed "the little mermaid wallet."
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Related legends
Talked about why the sharks do not swim bladder, which is related to a legend: in a long time ago, God created the fish, the shark is just a small fish. One day, suddenly thought of God, the contribution of the fish, just as a reward for all the fish swim bladder. But the naughty little sharks are in play, until after the small sharks know that God had gone. Can only keep a small shark swam ah tour. Swim more strong. Years later, God came up inspections found that the shark was very surprised that he was very fair each fish it! Why is this the only shark? He asked why the shark, shark replied: "Because then my ancestors did not get your gift, so he kept swimming, swim more stronger!"
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English Expression
: Shayu
n.: sea lawyer, shark, any of various types of sea-fish with a triangular fin on its back, some of which are large and dangerous to bathers