<h1>shark</h1>
It belongs to the vertebrate phylum Chondrichthyes ( Chondrichthyes ) plate gill suborder , marine , a small number of species into fresh water , a group of fast-swimming medium to large marine fish. 、
The inner skeleton of the shark is composed entirely of cartilage, often calcified, but without any true bone tissue, the exoskeleton is not very developed or degenerated, the body is often covered with skin teeth (scales), the teeth are diverse, with hard muscle, but the membrane bone is never present, and the skull is seamless. The upper forehead consists of square cartilage of the palate and the lower forehead consists of Meldonite cartilage. The latest research shows that sharks contain a variety of biologically active ingredients, such as anti-cancer factors, squalene, mucopolysaccharides and so on.
There are 8 orders and 25 families, about 250 to 300 species, and about 130 species in China's sea areas.
<h1>Six-gill sharks</h1>
Few species are extant, but are widespread in tropical and subtropical waters of the Pacific and Atlantic Oceans. The structure is primitive. 6 to 7 gill holes. There is no transient membrane or transient fold in the eye. There are water spray holes. 1 dorsal fin, no hard spines, posterior position, fin; the central axis bone of the pectoral fin extends to the anterior edge of the fin, and the cartilage of the front fin is unraveled. The spinal segmentation is incomplete, but the vertebral body is more calcified, and the spinal cord is partial or not constricted. Kiss 1 cartilage. The maxillary is two-sided, with the upper jaw joining the skull with a sieve and an ear process, and is not connected to the tongue-jaw cartilage. ovoviviparous. Fossils are found in the Mesozoic Jurassic.
Six-gill shark
Found at a depth of 1,400 metres in Australia's Coral Sea, the six-gill shark is the largest and oldest shark in the world and has not changed much since the Jurassic era 200 million years ago.
The six-gill shark is a large shark that can grow up to 18 feet (5.5 meters) and has a stunt that other sharks don't have, that is, they can change the color of their body for a short time. Since this shark is not fast to swim, they use this skill to mix with the background, and then sneak close to the fast swimming prey.
The sixgill shark eats a variety of animals, including cephalopods such as squid, crustaceans such as shrimp and crabs, various fish, and marine mammals, and is usually not dangerous to humans unless deliberately provoked. They can dive up to 6,000 feet (1,828.8 m) and chase migratory prey that feeds on the surface to the shallow ocean at night, so it is also a typical day and night migratory animal.
The six-gill shark reproduces in oviparous births. Since they spend most of their time in the deep sea, not much is known about the habits of this species of shark.
Grey six-gill shark
The grey six-gill shark is a species of six-gill shark, the largest of the six-gill shark family, with a body length of more than 4.8 meters and a fierce temperament.
The grey sixgill shark is oviparous and is the largest number of births in the six-gill shark family, with about 22-108 juvenile sharks, each about 70 cm long. They generally live at depths of more than 90 metres , with the deepest being recorded at 1,875 metres. Like other deep-sea creatures, the grey sixgill shark migrates vertically day and night. The grey six-gill shark is commonly found in Keelung, Taiwan, in specific areas, such as Hongbi Island near British Columbia, monterey submarine canyon in San Francisco Bay, and fjord mouth in Norway. It is generally found at a depth of 30 meters.
It has a vertical distribution day and night, inhabiting the bottom layer during the day and foraging for food at night to the upper layer. It feeds mainly on other small fish, small teleost fish, crustaceans and squid. Oviparous birth, the fetus can grow up to 650 mm in the mother's body, one litter can give birth to about 22-108 juvenile sharks, and the newborn baby shark body can be up to 60-70 cm long. Sexually mature when the body length is 2 meters. It is found in tropical and temperate waters.
Frilled shark
The frilled shark is a species of shark in the genus Frilled shark in the family Frilled shark family. The frilled shark, also known as the pseudo-eel, is the most primitive species of shark, with no subspecies differentiation, and is known as a "living fossil". There are six gill fissures on both sides of the body, and the gills are elongated and wrinkled, and cover each other, so they are named the frilled shark.
The reason why there are more gill clefts than other sharks is probably because most of them inhabit the deep-sea environment, which has a relatively low oxygen concentration, so more gill fissures are needed for gas exchange.
The frilled shark inhabits the deep sea and has a range that is almost all over the world but very scattered. Frilled sharks have long gestations and low reproductive and productivity, and their populations are very rare. It has important ecological value and has been included in the Red List of Species of China and the Red List of Threatened Species of the International Union for Conservation of Nature.
The frilled shark feeds on fish and other sharks, and its jaws are flexible and able to swallow their prey in its entirety.
Genus Hana shark
The Hana shark is a shark with 7 gills, multiple pointed teeth, the lower part of the tooth and consisting of a major tip and 3 to 8 small tips from the center outward. The main cusp is preceded by a series of small, small cusps. The roots are rectangular and flat. The upper teeth are smaller and narrower. Hana sharks live in cool shallow seas.
The genus Hana shark is a genus of fish in the family Hexagonal sharks. It has two more gills than the average shark, is oviparous, and is larger when mature.
Flat-headed Hana shark
The flathead hana shark is an animal of the genus Hana in the family Hexagram. Males are 150 to 180 cm long and females 192 to 208 cm long. The body is oblong fusiform, the head is broad and flattened, the snout is wide and round, and the eyes are oblong and there is no transient membrane. The upper and lower teeth are flattened on the sides; the upper jaw has no median teeth, with 6 teeth on each side, slender and oblique; the lower jaw has 1 middle tooth, and there are also 6 teeth on each side, and the broad flatten is comb-shaped. There are 7 gill holes on the side of the head, and the back 2 are smaller. 1 dorsal fin, starting from the posterior end of the ventral fin. The caudal fin is long, the upper caudal lobe is narrow, and the lower caudal lobe is broad. The body is grayish brown with irregular black spots. The abdomen, ventral fins and fins are light brown.
Activities are related to tidal cycles, slow swimming, fierce temperament, will hunt in groups, ambush prey, prey sharks, rays, dolphins, seals, bony fish and mammals carrion. It has a wide range of distribution, most of the world's temperate coastal areas have appeared, China is mainly distributed in the Yellow Sea and the East China Sea.
Lamprey shark genus
The genus Lamprey shark, a genus of six-gill sharks in the family Sixgill sharks, is a relatively old species with a structure that retains its primitive, oviviparous marine shark. The genus Lamprey shark is a genus of the sixgill shark family with a primitive structure. There are 6-7 gill holes, no transient post-recess of the eye, and there are water spray holes. The dorsal fin is one, without hard spines, posterior, with fin; the central axis bone of the pectoral fin extends to the anterior edge of the fin. The anterior fin cartilage is unraveled. ovoviviparous. Fossils are found in the Mesozoic Jurassic.
Sharp-nosed seven-gill shark
The barramundi shark is a species of shark in the genus Lamprey shark in the family Sixgills. The body is grey, olive or dark brown. Juvenile sharks have dark tips on their fins. It is well-proportioned and has a slender, long tail, so named after the six-gill shark or "seven-gill shark". Eats bony fish and squid, etc. Egg births, 9 to 20 litters per birth. The longest is about 137 cm, the male adult is about 85 cm long, and the female adult is 89-93 cm long.
It is distributed in the South China Sea, the East China Sea and the Yellow Sea; the Atlantic Ocean, the Mediterranean Sea, the Southwest Pacific (New South Wales, Victoria), the Southeast Pacific (Chile), and the Northwest Pacific (Japan, China).
Benthic deep-water large sharks, often at a depth of 27 to 270 m, can descend to 1000 m, sometimes in shallow water near the shore.
The sharp-nosed lamprey shark is not small, reaching a maximum of more than 2 meters, and is a large man among fish; however, it has a gentle temperament and never argues with its kind. It is simple for "people" and never wears bright or flower-spotted "clothes" to show off itself.
<h1>Porbeagle sharks</h1>
The order Porphyra, also known as mackerel sharks, is the largest order in the order Lateral holes. The order has 7 families, with 5 pairs of gill holes, 2 dorsal fins, no spines, and fins.
There are 5 pairs of gill holes, 2 dorsal fins, no spines, and fins. There is no transient membrane or transient fold in the eye. The vertebral body has radial calcification areas, and 4 non-calcified areas are free of calcified spoke invasion. The maxillary type is joined, and the upper jaw is attached only to the skull by ligaments. The front and back teeth of the two jaws are homomorphic.
Sword-kissed shark family
Sword-kissed shark
The sword-snout shark, sometimes referred to as euclidean barramundi, is a very peculiar deep-sea species. The shark is pinkish-white in color, with blue wings and elastic skin. It's one of the rarest species of sharks, and no one understands why it looks like this, and its long nose is a barrier to prey, but maybe it can help detect the presence of prey.
The sword-snout shark has a long flattened snout, sharp and cone-shaped teeth, which is ideal for catching fish or tearing off prey.
Habitat Ecology: This is a large benthic shark with limited knowledge of ecological habits. Most records show that it inhabits areas of about 270-960 meters deep on the continental slopes, but has also been found at depths of up to 1300 meters. The maximum body length can reach 385 cm.
Megalomaniaceae
Megalomaniac
Megaloman: 1 species in 1 genus worldwide. It is 4–5.5 m long and weighs up to 1 tonne (1,215 kg). The head is large, with fine teeth in the shape of whiskers, and like sharks of the basking and whale shark families, it feeds on filter plankton; there are light emitters near the mouth, which may be used to attract prey. The tail is long , but unlike the longtail shark family , the upper lobes are less pronounced upwards. The body color is brownish black and the abdomen is white. Unlike other species of porbeagle sharks , the giant mouth shark has a more rounded and inconspicuous snout.
Distributed in the Indian Ocean, the Pacific Ocean, the Atlantic Ocean, inhabiting depths between 5 and 1000 meters, mostly in the deep sea, so it is rarely captured. The giant-mouth shark was first spotted by the U.S. Navy in 1976 and has only appeared 60 times since then, which is a rarity.
Cone-toothed sharks
Carchariidae: A family of porcupines. There are only 1 genus and about 6 species. The body length is generally 2 to 3 meters. The largest is 6 meters. ovoviviparous. It is found in the Western Atlantic, North Atlantic, Mediterranean, Southwest atlantic and Indian Oceans. 2 species produced in China, fierce.
Sand tiger shark
The sand tiger shark is a species of shark in the genus Conetooth in the family Conetooth. Body length, total length 3-3.4 meters, weight, 95-110 kg. Also known as the orcamore shark, or cone-toothed shark, is a large shark that lives in coastal waters. It is now distributed in different parts of the Atlantic, Indian and Pacific Oceans. The sand tiger shark is fierce in appearance, but they tend to be docile and are not aggressive unless provoked. The main diet is bony fish (including large perch), other sharks and fish, squid, crabs and lobsters.
Porphyllaceae
Barramundi shark
The barramundi shark, also known as the grey mackerel shark, is a species of shark in the genus Mackerel in the family Mackerel. One of the four thermostatic sharks, it can grow up to 3-4 meters long at full length and weigh up to 800 kg, with a cyan back and a white compound. It is found in temperate and tropical offshore waters. They are ocean-going species that inhabit the sea to a depth of 150 meters. They rarely appear in places where the water temperature is below 16 ° C. The speed recorded for mackerel sharks is 50 kilometers per hour, and they can jump up to 9 meters high.
Barramundi sharks feed mainly on bony fish , including mackerel , tuna , bonito and swordfish , but also eat other sharks , porpoises and turtles.
Man-eating shark genus
Man-eating shark is a genus of sharks in the family Porphyllaceae. They are the most ferocious of sharks, more than 12 meters long, with jagged teeth in their mouths. The great white shark first appeared in the Miocene and is the only surviving member of the genus Man-Eating Shark.
They are extremely fast, often hunting down large sea animals and fish such as sea lions, seals, sturgeon, tuna and so on. Large man-eating sharks even attack fishing boats and eat people when hungry. Man-eating sharks have a very sensitive sense of smell, especially for the smell of blood. Once the fallen people bleed, the nearby man-eating sharks will flock to the water, and the result is conceivable, not all sharks eat people, and there are only a few kinds of man-eating sharks. Widely distributed in tropical and subtropical sea areas, China is found in the South China Sea and the East China Sea.
<h1>Man-eating shark (great white shark).</h1>
Man-eating sharks are also known as man-eating sharks. It is a large ferocious shark of the genus Man-eating sharks of the family Porphyllaceae. It is widely distributed in tropical, subtropical and temperate oceans. It is the largest of the predators and one of the three dangerous sharks for humans, and the attacks generally occur on shallow beaches. The type species are found in the Mediterranean and Atlantic Oceans.
The great white shark, also known as the man-eating shark, is the largest carnivorous fish, up to 6.5 meters long, weighing 3200 kg, with a crescent-shaped tail, large and serrated teeth, triangular, 10 cm long teeth, large aggressive shark. But because of its particularly large size, it can be considered to be the ultimate predator of the food chain, that is, the highest consumer.
Great white sharks are found in tropical and temperate regions of the oceans , generally living in open ocean areas , but often entering inland waters. They prefer to prey on seals, sea lions, and occasionally dolphins and whale carcasses.
The great white shark first appeared in the Miocene and is the only surviving member of the genus Man-Eating Shark. Therefore, its survival is very difficult, and it can be said that the existence of every great white shark is a miracle of the evolution of life, just like the dinosaurs of the Cretaceous Period. As the population of the great white shark is decreasing and on the verge of extinction, the great white shark is now listed as a protected species in the world and hunting is prohibited.
Great white sharks
<h1>Tiger shark order</h1>
Tiger sharks, a suborder of the cartilaginous fish order Plate gill. It includes nine smaller species of sharks that live on tropical and subtropical seafloor. The length of these sharks is between 50-150 cm.
It is a small and medium-sized shark, up to 1.5 meters long, with a large and short body and a head height nearly square. The snout is short and blunt, the eyes are small, oval, and the upper lateral position. The nostrils have a nasal groove.
It is distributed in tropical and temperate sea areas of the Pacific Ocean and Indian Ocean. There are two species of broad-striped tiger shark and narrow-striped tiger shark in China.
Broad-striped tiger shark
The broad-striped tiger shark, also known as the Japanese heterodonted shark, is a small and medium-sized shark that prefers to inhabit the coastal shelf at 6 to 37 meters, often infesting rocks and seaweed-strewn seabeds. It is possible to "walk" on the seabed with double fins. The body is yellowish brown with dark brown broad horizontal stripes, broadly narrowly overlapping behind the head. It is found in the Yellow Sea and the East China Sea. It is also found off the coast of Japan and Korea. Fossils are found in the Jurassic period.
Tiger shark
The Tiger Shark, commonly known as the Horned Shark, is found in the Eastern Pacific Region, from central California to the Gulf of California in Mexico, and is carnivorous, fish-eating and benthic invertebrates, especially sea urchins and crabs.
Orbital tiger shark
The orbital tiger shark is a species of tiger shark found on the continental shelf in eastern Australia. It feeds mainly on sea urchins and is oviparous. The maximum body length is up to 1.5 meters, there is a higher bulge above the eyes, and there are dark black stripes on the body.
<h1>True sharks</h1>
The order Eucalyptus is an order of chordate phylum, vertebrate subphylum, and cartilaginous fish. There are 1 family and nearly 100 species in 24 genera, and there are more than 30 species in 11 genera in China.
The eyes are small, round, a few oval. The water spray holes are small or disappear. The nostrils are small and far from the mouth. The mouth is wide, single-toothed, and a few three-toothed. 2 dorsal fins, no hard spines. The caudal vertebrae are upturned, the caudal fin is broad, and the anterior triangular prominence of the lower lobe is prominent. Oviparous or fetal.
Hammerhead shark
Hammerhead sharks, also known as hammerhead sharks, are a collective name for sharks and hammerhead sharks. The hammerhead shark gets its name from the shape of its head. The head of the hammerhead has two protrusions on the left and right. Each protrusion has an eye and a nostril. The two eyes are 1 meter apart. A recent study confirmed that the distribution of the eye is very beneficial for it to observe its surroundings. Not only does the hammerhead have binocular vision like a human (the visions of both eyes overlap), but it can see what is happening within 360 degrees around it by rocking its head back and forth.
In September 2018, a joint research team in the United States found that a narrow-headed hammerhead shark not only eats meat, but also eats seaweed.
Hot, temperate oceans.
<h1>Horned sharks</h1>
Squalids, a suborder of the cartilaginous fish order Plate gill. There are 87 species in 21 genera in 3 families. 2 dorsal fins, hard spines with or without; fins disappear. 5 gill foramen, vertebral body ring type or multi-ring type. Kiss 1 cartilage. It is mainly distributed in the warm, cold water or deep sea areas of the world.
Horned sharks. The body length is more than 1 meter. 5 gill holes, short or medium-length snout, lateral to the eye. The nostrils are quite far from the mouth. There are 2 dorsal fins, each with 1 hard spine, and the pectoral fin is located behind the last gill hole. Single or multi-toothed head type. Fossils are found in the Cretaceous period. There are about 71 species in more than 10 genera, and there are 8 genera and 4 species in China, commonly including white-spotted horned sharks, long-snouted horned sharks, and short-snouted horned sharks. Horned sharks inhabit coastal areas and feed mainly on small fish, but also on mollusks, crustaceans and link animals and jellyfish. The egg is fetal, the egg is large, the yolk tube is thick and short, and it is not connected to the mother's uterine wall. The meat is delicious, the production is large, mainly for fresh food, the liver oil content is quite high, and the fins of larger individuals can be made into shark fins.
White-spotted horned shark
The white-spotted horned shark, a species of fish in the genus Horned shark in the family Sergeidae. The white-spotted horned shark, also known as the spiny horn shark or Sassy shark, is a well-known member of the genus Horned Shark that is found in most of the world's shallow and surface waters, especially in temperate waters. They are characterized by fin spines on both dorsal fins and no fins.
Thin and elongated. The head is flat and long, the head width is larger than the head height, and the head length is about 1/5 of the total length. The tail is slender , much shorter than the head and torso , with a depression above the base of the tail , and a longitudinal protrusion on the underside of the caudal stem from below the base of the second dorsal fin to a later stage of the caudal base.
The white-spotted horned shark lives in the western Atlantic, eastern Atlantic, western and eastern Pacific Oceans, as well as the Mediterranean and Black Seas, along the coastline. The white-spotted horned shark is shallow and in the sea, especially in temperate waters, with a water depth of about 50-149 meters and a suitable temperature of 7-15 degrees Celsius. Live in groups of hundreds to thousands. Groups are generally made up of similar body sizes and genders. They feed on bony fish, tiny sharks and a variety of invertebrates. They are also prey to other large fish , other sharks , and mammals in the water.
Longnose shark
The giraffe shark, also known as the carcass spiny mackerel, is a shark in the family Horned Shark family, distributed in the continental sheds, island abutments and continental slopes of tropical and subtropical oceans from 45° north to 55° south, with water depths of up to 950 meters. They can generally be up to 75 cm long.
The giraffe shark is a large genus of horned sharks with a long, horned snout and a thin mouth, only about half the length of the snout. They generally have no spots on their bodies , a pearly grey back and a white belly. The first dorsal fin spine is above the pectoral fin, which has white edges. They feed on bony fish such as cod, pike, moray eel, lanternfish, cephalopods and crustaceans.
They are oviparous, with about 4-9 juvenile sharks per litter.
Alligator sharks
The allogenera snout shark, a species of shark in the genus Horned shark in the family Horned Shark family. Thin and elongated. The head is flattened , the tail is slender , the snout is short and rounded , and the dorsal view is nearly curved. The eyes are oblong oval, rounded at the front, pointed and unmarked at the posterior end, broad in mouth, nearly transverse, dark brown on the back, pale brown on the ventral surface, dark brown at the end of the dorsal fin, and light on the posterior margin of the pectoral and ventral fins.
It mainly inhabits coastal areas and mainly eats small fish, but also mollusks, crustaceans and link animals and jellyfish. Oviparous, the egg is large, the yolk tube is short, and it is not connected to the mother's uterine wall.
Shark family. Usually the first dorsal or second dorsal fin is spineless or hidden, the upper teeth are thinly conical, and the mandibular teeth are broad and leafy, stacked on top of each other, with smooth edges or fine serrations. It is mainly produced in the deep sea. There are about 12 species in 8 genera. In China, the armored shark and the broad-tailed small horned shark are native to Taiwan; the lip Dharma shark is produced in the South China Sea.
Armored sharks
The armored shark is a species of fish in the genus Armored shark in the family Armored shark family. It is found in the Western Atlantic Ocean: from the Georgia Shoals of New England to the northern Gulf of Mexico. Eastern Atlantic: Includes the Atlantic slopes of Iceland, Scotland and Ireland to Morocco, the western Mediterranean, the Madeira Islands to Cameroon.
The snout is short, broadly conical. The lips are thick and wrinkled. The upper and lower teeth are heterogeneous, the upper teeth are narrow and hook-like, and the mandibular teeth are large, broad-leaf-like, and the crown is triangular, with fine serrated margins. Neither dorsal fin has spines. The second dorsal fin is slightly larger than the first dorsal fin. The pectoral fin is short and the posterior margin is broadly rounded. The caudal fin is under-developed all the time. The shield scales are low and flat, single spinous. The body is grayish black or black brown. Edible fish, cod liver can be made into cod liver oil. One of the important sources of squalene extract in its liver oil.
Spiny shark family. Both dorsal fins are spineless. The upper and lower stool teeth are of the same type, and the number of teeth is pointed. There are only 1 genus and 2 species of spiny sharks. The spiny shark, recorded in Taiwan, is distributed in the northeast of the Atlantic, the Mediterranean, Japan, Australia, New Zealand, etc.
<h1>Sawsharks</h1>
There are about 13 species in 1 family and 1 genus in the order sawshark. Flattened body; short and wide snout; broad pectoral fin and extending to the side of the head such as robe sleeves, formerly known as sleeve fish, commonly known in the West as angel fish or monk fish; upper eye; broad mouth, sub-anterior position; upper teeth, jaw homotype, slender single-tooth head type; anterior nostril position; gill hole 5, wide, extended to the ventral surface; dorsal fin 2, no hard spines. It is widely distributed in the Tropical and Temperate Atlantic, Mediterranean and Pacific Oceans, and is also found on the eastern coast of southern Africa. There are 4 species in our country. It is a secondary economic fish in the Yellow Sea and the East China Sea, and has a large production in the Yellow Sea, and is one of the fishing objects. The East China Sea produces less and is a bottom-dragging net and fishing class.
Genus Six-gill sawshark
The genus Sixgill sawshark is a genus of sawsharks in the family Sawsharkidae. There are 6 gill holes, only 1 species, distributed on the southeast coast of southern Africa.
Six-gill sawshark
The genus Sixgill sawsharks have six gill cleavages, and other species, like regular sharks, have only five gill cleavages.
Thanks to the saw-shaped mouth (called the kiss) with inlaid teeth, these sawsharks become one of the most distinctive sharks. This peculiar evolution is so effective that these sharks use it to find food on the sandy or muddy seafloor and then stun their prey with their saw-shaped beaks. The six-gill sawshark is the only shark separated from the loach and has six gills, rather than the usual pentagill or lamprey. Certain species of sawsharks have a high food value, especially in Japan.
Distribution: The Western Indian Ocean beyond the southeastern coast of Southern Africa. Other saw shark species are found in both the western and western Pacific Oceans. Food: Bony fish, shrimp, squid. Breeding method: oviparous.
Long-snout sawshark
The long-snout sawshark is a species of shark in the family Sawshark in the family Sawshark. The snout of the long-snout sawshark protrudes into a long plate with sharp teeth on both sides to attack prey, similar to a saw, with two fleshy tentacles in the center of the plate to detect prey. It generally lives 40 meters under the sea, feeds on benthic organisms and fish, and is distributed in vast areas from South Africa to Japan.
<h1>Flat sharks</h1>
The order Flat Shark is an order of cartilaginous fishes, of which there are only 1 family of flat sharks, and there are about 13 species in the genus Flat shark. The body is flattened; the snout is short and wide; the pectoral fin is wide and extends to the side of the head like a robe sleeve, so it is formerly called the sleeve fish, commonly known in the West as angel fish or monk fish; the upper eye; the mouth is wide, sub-anterior; the upper and lower jaws are of the same type, the slender single-tooth head type; the anterior nostril position; the gill hole is 5, wide, extending to the ventral surface; the dorsal fin is 2, without hard spines.
It is widely distributed in the Tropical and Temperate Atlantic, Mediterranean and Pacific Oceans, and is also found on the eastern coast of southern Africa.
Flat shark
Flat shark, is a kind of shark under the flat shark family, flat shark appearance is different from the common shark, its body is flat, much like a lute, so some people also call it a lute shark.
It was once widely distributed in the coastal waters of the northeast Atlantic Ocean. Their bodies are flattened and their pectoral and fins are wide, allowing them to disguise themselves as part of the seabed. They are characterized by conical tentacles , no spines on the back and are grey or brown , with some dark and light markings. They can be up to 2.4 meters long.
Flat sharks usually do not like to move, wearing a color similar to the environment, lurking on the bottom of the sea to catch food. However, once frightened, it can be used to "fly" and "glide" with the help of its wide pectoral fins, especially the "starting" speed is very amazing. Flat sharks are nocturnal and will hide themselves in sediments to ambush their prey. They feed mainly on benthic bony fish , rays and invertebrates. The flat shark was hunted for food as early as ancient Greece and was sold to Europe as a well-being fish.
Since the 20th century, frequent fishing has led to a significant decline in their numbers and is now extinct from the north. The remaining communities are also threatened by low reproduction rates. The International Union for Conservation of Nature has therefore classified them as critically endangered.
<h1>Whiskered sharks</h1>
The order Squid , also known as The Order Squid , is divided into two suborders , namely the suborder Laryngeal squid and the suborder Squid.
Reaming shark
Nurse shark, Chinese name: reaming shark, belongs to the order Whisker shark, reamer shark family, reaming shark genus. There are 3 genera and 3 species in the family Rhaburidae in the world. The body length is 3 meters and the weight can reach about 100 kilograms. Rest on the ocean floor or inside caves during the day and hunt at night. Fish, crustaceans and molluscs are usually caught by smoking. Sensitive sense of smell. ovoviviparous. Tropical and subtropical seas along the Atlantic and Pacific coasts along the Americas and West Africa are occasionally seen, most common in the Caribbean.
The reaming shark is a delicate and gentle shark, and is one of the common shark species in medium and large aquariums.
The reaming shark is a small group of sharks, which are largely nocturnal creatures, usually lying on the sandy seabed or hiding in caves to rest during the day, and come out at night to hunt. Occasionally they use their strong pectoral fins to drag themselves along the coastal bed, usually swimming in the traditional way. They are docile and do not actively attack humans. Fish (including stingrays), crustaceans and mollusks are usually caught by smoking, and algae are also eaten. Sensitive sense of smell.
Whiskers
Japanese whisker shark
Spotted shark family
Orange-yellow shark
The orange-yellow shark is a fish of the genus Orange-yellow shark in the family Orange-yellow shark family. It can reach a length of up to 34 cm and reproduces as an oviparous. It is found in northern Luzon, Philippines, as well as off the coast of Guangdong and in the seas of Hainan Island and the South China Sea, North Korea. It generally lives in deeper subtropical offshore areas, at depths of 180–190 m. The type origin of this species is in China. It is the smallest shark.
Cetaceans
There is only 1 genus and 1 species, namely the whale shark Rhincodon typus. With a large body and a total length of up to 20 meters, it is the largest fish in the world. The surface of the body is scattered with pale spots and crisscrossing pale bands, like a chessboard. The nostrils are located on either side of the upper lip and appear in the mouth. The teeth are numerous and small, arranged in rows. There are 5 pairs of gill fissures, the gill fissures are large, almost reaching the dorsal and abdominal margins of the body, and the last pair of gill fissures is located in front of the base of the pectoral fin. The dorsal fin is 2, spineless, and the 1st dorsal fin is located in front of the ventral fin and has an fin. The caudal stalk is laterally ridged , the caudal fin is crescent-shaped , and the lower lobes are shorter than the upper lobes. For example, whale sharks, with two dorsal fins, varying sizes, large pectoral fins, located under the third pair of gill fissures, small ventral fins, forked tail fins, wide mouth, terminal position, gill rakers like sponges. Eats large amounts of plankton and small fish. It is a marine fish species. Every year in May and June, it migrates to the Beibu Gulf of China. It is widely distributed in tropical and temperate sea areas, and is distributed in summer and autumn in all sea areas of China. Gentle temperament. Due to the large number of hunting, the number has dropped sharply.
There is only 1 species in 1 genus, namely the whale shark. With a large body and a total length of up to 20 meters, it is the largest fish in the world.
<h1>Whale </h1>
Whale sharks, sharks of the genus Cetacean in the family Cetaceae. Whale sharks have only 1 family and 1 genus and 1 species. With a large body and a total length of up to 20 meters, it is the largest fish in the world. The surface of the body is scattered with pale spots and crisscrossing pale bands, like a chessboard. The nostrils are located on either side of the upper lip and appear in the mouth. The teeth are numerous and small, arranged in rows. There are 5 pairs of gill fissures, the gill fissures are large, almost reaching the dorsal and abdominal margins of the body, and the last pair of gill fissures is located in front of the base of the pectoral fin. The dorsal fin is 2, spineless, and the 1st dorsal fin is located in front of the ventral fin and has an fin. The caudal stalk is laterally ridged , the caudal fin is crescent-shaped , and the lower lobes are shorter than the upper lobes. For example, whale sharks, with two dorsal fins, varying sizes, large pectoral fins, located under the third pair of gill fissures, small ventral fins, forked tail fins, wide mouth, terminal position, gill rakers like sponges.
It is a marine fish species. Eats large amounts of plankton and small fish. It is mainly distributed in tropical and temperate sea areas, and is distributed in summer and autumn in all sea areas of China. Gentle temperament. Due to the large number of hunting, the number has dropped sharply.
Whale
Leopard shark family
There is only 1 genus and 1 species, namely the leopard shark Stegostoma fasciatum. The body is trunk cylindrical , with a flattened caudal side ; the body side has a distinct ridge. The head is conical and slightly flattened; the side of the head is not covered with skin folds.
Leopard shark, also known as the big-tailed tiger mackerel. It is the only genus (leopard shark genus) in the family Leopard shark family also known as the Tiger Mackerel family (one of the cartilaginous fishes of the suborder Plate Gill shark order). It is mostly distributed in the tropical waters of the western Pacific Ocean, the Great Barrier Reef, the northwestern part of the Indian Ocean and the East and South China Seas of China. Shy by nature, slow-moving, carnivorous, feeding on benthic invertebrates and small fish, oviparous.
They are docile, enjoy nocturnal activities, and can freely travel through coral reef dens. Often lived alone, no record of attacking humans, difficult to keep. In the aquarium is a rare and valuable ornamental shark.
Leopard shark
Leopard shark
<h1>Megalodon</h1>
Megalodon, which means "big teeth" in Greek. The shark averages 14 meters long and weighs 40 tons. Some of the fossil vertebrae of the megalodon shark have been found to be much larger than the great white shark, and it is speculated that it may be more than 20 meters and weigh 70 tons, but no complete vertebral bone fossils have been found to prove its hypothesis. Megalodon sharks are perhaps the most bite-forced creatures ever discovered in Earth's history, with a maximum bite force of 20 tons, and their oral bite power exceeds that of Tyrannosaurus rex, which can easily bite the ribs of whales. It is one of the largest predators ever built, and at the same time the largest fish. Living from the Late Oligocene 15 million years ago to the Early Pleistocene 2.6 million years ago, it was the top predator of the seas in its living age. They are hailed by many paleontologists as the most powerful creatures in earth's history.
Megalodon
Images and content are from the Internet, if you have any questions, please feel free to contact