Sharks, which live in the ocean, are fish in the ocean. Sharks have existed on Earth 300 million years before the advent of dinosaurs, and they have been on the earth for more than 500 million years, and they have hardly changed in the past 100 million years. Sharks, known in ancient times as mackerel, mackerel sharks, sand fish, are the behemoths in the ocean, so they are called "wolves in the sea".
Great white sharks
The great white shark (scientific name: Carcharodon carcharias), also known as man-eating sharks, is the largest carnivorous fish, up to 6.5 meters long, weighing 3200 kg, the tail is crescent-shaped, the teeth are large and serrated edges, triangular, teeth 10 cm long, large offensive 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.
Bull sharks
Bull sharks are small, relatively broader than other sharks, with a large torso and spindle-shaped entire body. The dorsal side is dark grey and the ventral side is off-white. Male bull sharks can grow up to 2.1 meters long and weigh 90 kg. Females are larger, reaching 3.5 meters long and weighing 230 kilograms. The bull shark has a broad flattened head with a depression above and below the base of the tail. Bull shark eyes are round and the transient membrane is developed. The anterior nasal flap is broadly triangular; there is no nasal suscence or tentacles. Bull sharks are found in any tropical and subtropical coastal waters from Western Australia to Brazil.
Tiger shark
Tiger sharks (scientific name: Heterodontus) is a collective name for all species of the genus "Tiger Shark" in the family Homodontidae of the cartilaginous fish family (Selachii). It is characterized by a large, hard spine on each of the leading edges of the two dorsal fins. There are about 10 species. Seafood, benthic, can be seen almost everywhere except in the Mediterranean and Atlantic Oceans. Usually 3.25-4.25 meters, the longest is 6 meters. Both palates have sharp teeth, with the front teeth and molars on both sides. Feeds on invertebrates such as sea urchins and crustaceans.
Whale
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.
Great blue shark
The great blue shark, a species of shark, has an elongated body, 2-4 meters. The body is approximately spindle-shaped. The head is broad and flattened, less than a quarter of the total length; the snout is triangular, long and pointed. The eyes are small and round. The mouth is half-moon-shaped, with triangular upper teeth with fine serrations at the edges; the mandibular teeth are narrower and pointed. There are 28-30 teeth on each upper and lower jaws. There are 5 gill holes. The dorsal fin is two, the first is small, the upper corner is bluntly pointed, and the lower corner is pointed; the second dorsal fin is smaller than the fin. The tail is slender , with a depression above and below the caudal fin. The pectoral fins are sickle-shaped. The ventral fin is small and approximately square. The back and upper sides of the body are grayish-cyan, and the ventral and lower sides are white. Fierce temperament and agile swimming. It is found in temperate warm seas and tropical oceans. Commonly found on the surface of the sea, it is a gluttonous squid, squid and other sharks.
porbeagle
The porbeque shark, also known as the Atlantic mackerel shark, is a large pelagic shark of the family Porbeagle shark family. The porbeagle shark is a solid and heavy shark with a dark blue back, a white belly, and a tapered nose. Porbeagle sharks can grow up to 3.7 meters long and weigh 160-250 kg. The most special place is that there is a white bun on the dorsal fin. This sets them apart from the Pacific Porphyra and the Great White Shark. There are two keels on the caudal fin, similar to the Pacific Porch shark. It feeds mainly on small spoke-finned fish such as mackerel, herring, sail lizards and knifefish. It is notorious for sometimes carrying out deadly attacks on swimmers, divers, surfers, and even small boats in uninvited conditions. It is found in the atlantic, southern Indian, south Pacific and Antarctica waters.
Basking sharks
Basking sharks are the only species in the family Basking and the genus Basking. It is the second largest fish in the world following the whale shark. Basking sharks are found in temperate oceans around the world. They swim slowly, are generally harmless and rely on plankton for food. They migrate frequently and occur seasonally in certain areas. Like other large sharks, basking sharks are at risk of extinction due to their low breeding and overfishing to supply the world's demand for shark fins, meat and organs.
Six-gill shark
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 six-gill shark is found at a depth of 1400 metres in the Australian Coral Sea. In 2006, the Australian Deep Sea Research project team used the latest technology remote control camera to study and photograph Australian deep-sea species, and found a large number of strange deep-sea species, including the six-gill shark.
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.
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.
Greenland Sleeping Shark
The Greenland sleeping shark can reach a maximum of 7 meters and is comparable in body length to that of the great white shark. Known for its slow movements, it is inhabited further north than any shark. They are close relatives of the Pacific sleeping shark. The dorsal fins are 2, usually each with a spine; the fin disappears. There are 5 gill holes, located in the low front of the pectoral fin base. Lateral position of the eye. Greenland sleeping shark meat contains a neurotoxin called trimethylamine oxide. This shark is as ferocious as a great white shark. With seabirds, squid, crustaceans, mollusks, and a variety of carrion and offal as their main diet, Greenland sharks are also known as "crocodiles in the ocean" because they also eat marine mammals. Inuit used to capture the Greenland sleeping shark in order to make a knife from its razor-sharp teeth and make cod liver oil into an oil lamp.
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. Sawsharks are timid, often stationary during the day, preying on small fish, crustaceans and deep-sea invertebrates at night, and they use those two long tentacles to search for food, which is rare and difficult to observe, and if they feel disturbed, the mouth like a sword can hurt people.
Euclidean barramundi
Sharks in general have very well-developed muscles, are fast, agile, and extremely fierce. But the sword-snout shark's muscles are weak and weak, and other characteristics of its body suggest that it is slow. Such sharks are not a threat to people, and it is also problematic to hunt down and kill prey. Of course, the sword-snout shark is not vegetarian, and examining its stomach food shows that it feeds on bony fish, squid, and crustaceans. Their teeth are so sharp that they can swallow the prey in its entirety.
Blanket sharks
During a census of fish in the Great Barrier Reef, scientists at the Australian Research Council's Coral Reef Research Centre took a set of photographs showing a terrifying sight of a tasseled wobbegong swallowing a spotted bamboo shark. For the first time in history, a photo of sharks cannibalizing has been taken. Observations of this shark cannibalism were published in the latest issue of Coral Reef magazine. Off Australia's Great Barrier Reef, blanket sharks are devouring bamboo sharks. The blanket shark and the bamboo shark in the photo are of comparable size, ranging from head to tail in length between 39 and 59 inches (about 100 to 150 centimeters).
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.
Cigar Dharma shark
Cigar Dharma sharks have huge eyes and can emit green biofluorescence, which are mainly nocturnal. Green fluorescence comes from organs in the skin called "photophores", and whether or not it fluorescence is determined by melanophores in the skin. Small sharks, living in warm seas, deep waters, are only 42-56 cm in size, with a short cylindrical body, large eyes, two small dorsal fins and a huge tail fin, and are fierce. It bites the prey with its sharp jaw teeth and tears it off in a body rotation, so named after the hole-like wounds left on the prey that resemble a cigar.
Ghost sharks
The ghost shark belongs to the all-headed suborder , silver mackerel , an aquatic creature named after a combination of animal traits. Silver mackerel is still called "living fossil". Silver mackerel is silvery grey or dark brown. It is mainly distributed in the tropical and temperate deep sea areas of the Atlantic and Pacific Oceans, usually living on the bottom of the deep sea. Marine life is a distant relative of modern sharks, and ghost sharks separated from their closest relatives, the shark family, about 400 million years ago.