28.10.2019
The fox shark is a fighting fox fish. Species: Alopias vulpinus = Common Sea Fox
Even in the depths of the sea there are workers - honestly "earns" their bread, that is, fish, fox shark or sea fox (Alopias).
With its large dimensions, the fox shark does not have a particular desire to attack a person, since it feeds on schooling fish, but if it is completely hungry, it starts chasing swimming invertebrates and even.
How does a fox shark hunt?
The fox shark is famous for its tail and the way it is used: having tracked down a school of fish of mackerel, mackerel, herring and other prey, the shark begins to circle, gradually disorganizing the prey.
With each turn, the ring narrows, the fish bunches up, loses orientation, and it’s time to use the tail for its intended purpose: like a flail on a thresher, a shark methodically kills the fish, after which you can safely proceed to dinner – the stunned prey will not go anywhere for some time.
Watch video - Fox shark hunts:
Now it is clear English name fox shark (thresher shark) - thresher shark. One problem, you need to eat a lot and at once - it is not known when luck will smile again.
The one glorified in legends helps out: the shark regurgitates what has already been chewed and greedily pounces on a new portion.
Why is the shark called a fox?
For work, that is, for food, the fox shark uses its unsurpassed tail, which, on average, occupies half the length of the body of a sea flier. Accordingly, if the length of the predator is 5-6 meters, then the length of the tail: 2.5-3 meters.
It's really formidable weapon, consisting of a strongly elongated upper caudal lobe (the lower lobe is almost atrophied), which starts from a strongly flattened caudal peduncle. With all this, its weight can reach 500 kg.
Watch video - Fox shark jump:
Description of the fox shark
Otherwise, the fox shark is a typical representative. The body is spindle-shaped, arched in the back. The head is small, broad and short.
The mouth is small; mouth opening in the shape of a crescent; , form rows, sometimes up to 20. The eyes, depending on the species, may be normal or very large. Five small gill slits, and spiracles may be absent.
The color is different (do not forget that there are three types in the family): gray, sometimes with a metallic sheen; gray-blue, gray-black, gray-brown - the back is always darker than the belly. Under the head and fins the color is the same as on the back.
The first dorsal fin is large, but the second dorsal and anal fins are small.
It lives almost everywhere: in the Pacific, Indian and Atlantic oceans, in almost all tropical and subtropical marine waters.
Sexual maturity occurs at a certain height, an average of 4 meters. Quite often they do not live alone, but in pairs: it is believed that for joint hunting it is easier to find a flock of fish and it is easier to jam, working in two tails.
Watch the video - Fighting tail of the fox shark:
Fox shark, for one litter brings 2-4 sharks. During the breeding season, it moves closer to the coast, where it stays for several months, tracking how the water temperature affects the growing offspring.
Fortunately, the predator has no commercial value, does not like to settle down on the coast, has a formidable weapon and large size - all this helps her a lot not to get into the Red Book.
True, the fishermen do not really like the sea fox breed - hunting for fish flocks, the sea foxes get into the nets and ruthlessly tear them. Therefore, fishermen are happy to use the shark they caught as bait for other fish.
The largest is the sea fox (Alopias vulpinus), its size is 5.5-6 meters, it can be found in coastal areas.
The smallest is the pelagic fox shark (Alopias pelagicus), about 3 meters in size, lives at a depth away from the coast. The color is a beautiful dark blue with a whitish belly. Has flat wide pectoral fins.
The second species has larger eyes than red fox, but not the same as those of the big-eyed.
The most "beautiful" big-eyed shark (Alopias superciliosus) has unnaturally large bulging eyes.
And what unites all representatives of this family is the possession of a magnificent fox tail!
Bigeye fox shark, or big-eyed sea fox, or bigeye fox shark, or deep sea fox(lat. Alopias superciliosus) - a species of cartilaginous fish of the genus fox sharks of the family of the same name of the order of lamniformes. It lives in all temperate and tropical waters of the Indian, Pacific and Atlantic oceans. It reaches 4.9 m. Bigeye fox sharks have an elongated upper lobe of the caudal fin, characteristic of fox sharks. The eyes are very large, up to 10 cm in diameter in adults. They have a streamlined body, a short and pointed snout. Their eyes are adapted to hunting in low light conditions. It is one of the few shark species that make diurnal vertical migrations. They spend the day at depth, and at night they rise to the surface to hunt.
Thresher sharks hunt using their long tail like a whip. They knock down the joint and stun their prey, this explains their English name. Thresher shark, which literally translates as "thresher shark". Reproduction occurs by placental live birth. There are 2 to 4 newborns in a litter. Embryos eat unfertilized eggs produced by the mother (oophagy).
Bigeye fox sharks are not dangerous to humans. Their meat and fins are highly valued and the species is commercially and sport fished. Low level reproductive performance makes these sharks very susceptible to overfishing.
Taxonomy
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Genus: Alopias Rafinesque = Fox sharks, sea foxes
Species: Alopias vulpinus (Bonnaterre, 1788) = Sea fox
Sea fox = Alopias vulpinus
The sea fox (Thresher Shark) was first described by Bonnaterre in 1788 as Squalus vulpinis and later changed to the current name: Alopias vulpinus (Bonaterre, 1788). The word Vulpinus is derived from "fox" - in Latin vulpes.
Synonymous names include Squalus vulpes Gmelin 1789, Alopias macrourus Rafinesque 1810, Galeus vulpecula Rafinesque 1810, Alopias caudatus Philipps 1932, Alopas greyi Whitely 1937 and others.
It is also called: Fox Shark, Sea Fox, Common thresher, Fish shark, Fox shark, Longtail shark, Sea fox, Swingtail, Swiveltail, Thresher, Thresher shark, Whiptail shark
The common sea fox is widespread in all oceans, mainly in temperate and subtropical zones. In the warm season, this shark migrates to the seas. temperate zone. IN Atlantic Ocean for example, it reaches the Gulf of St. Lawrence and the Lofoten Islands (Northern Norway) in summer.
In the western Atlantic, it is found from Newfoundland to Cuba and from southern Brazil to Argentina. In the eastern Atlantic from Norway and the British Isles to Ghana and the Ivory Coast, including the Mediterranean Sea.
In the Indo-Pacific region, it is found in the waters of South Africa, Tanzania, Somalia, the Maldives, the Chagos Archipelago, the Gulf of Aden, Pakistan, India, Sri Lanka, Sumatra, Japan, the Republic of Korea, Australia, New Zealand, and New Caledonia. The shark is also found in the Islands of Oceania, the Hawaiian Islands, and in the eastern Pacific region - from the coast of British Columbia through central California and Panama south to Chile.
The common sea fox lives in tropical and temperate waters, and is found both in the open ocean and near the coast. It usually stays in the surface layers of water, sometimes making jumps above the surface.
The sea fox prefers cool sea water, but can also wander in cold coastal areas. It can, if necessary, dive to a depth of 350 m.
The sea fox is a typical pelagic shark. The common sea fox reaches 5-6 m in length. The maximum recorded length is 760 cm. Adult sea foxes weigh between 200-350 kg. The maximum weight is about 450 kg. It has small jaws but can use its tail to drive and even kill fish. Their tail keel has a very elongated upper lobe. The pectoral fins are crescent-shaped, narrow and curved. Like other sharks, it has an anal fin, 5 gill slits, 2 dorsal fins without any internal skeleton, the mouth is behind the eyes, and the eyes are without blinking eyelids.
The sea fox has few, blade-like, smooth, crooked teeth. There are 20 teeth on both sides of the upper jaw and 21 teeth on both sides mandible. The teeth from a specimen caught off the coast of Massachusetts were almost 13 feet long.
The body of a common sea fox with a brown, gray or black back and a light belly, but there are dark spots near the pelvic fin and the beginning of the tail. The sides of the body are above the base of the pectoral fins with a white patch that extends forward from the ventral region.
Large sharks attack young sea foxes, but adults have no known predators. The sea fox lives for 20 years or more.
The usual food of the sea fox is various schooling fish, which it devours in large numbers.
Bony fish make up 97% of the sea fox's diet. Blue fish and butterfish are the most common food. They also feed on mackerel, herring, mackerel and other species.
The teeth are small, but strong and sharp, they are able to grab not only a variety of fish, but also squid, octopus, crab, and even seabirds.
By way of life, the sea fox is a pelagic, highly migratory species, leading a nocturnal lifestyle. She - sea view inhabiting both coastal and ocean waters. It is most commonly observed far from the coast, despite the fact that it often cruises close to the coast in search of food. Adults are common over the continental shelf, while juveniles live in coastal bays and near the water's edge.
The sea fox uses its long tail as its main weapon when hunting. Approaching a school of fish, the sea fox begins to circle around it, foaming the water with whip-like strokes of the caudal fin. Gradually, the circles become smaller and smaller, and the frightened fish gather in an increasingly compact group. It is then that the shark begins to greedily swallow its prey. A couple of sea foxes sometimes participate in such a hunt.
In some cases, the sea fox acts like a flail with its tail fin, using it to stun its prey. Fish are not always such a victim. In particular, a shark was observed attacking seabirds sitting on the surface of the water in this way. An accurate blow with the tail - and the unfolded shark grabs its not quite ordinary prey.
In the stomach of one specimen, about 4 m long, for example, 27 large mackerels were found.
They are very strong swimmers, so they can jump almost entirely out of the water.
Reproduction occurs by ovoviviparity (there is no placenta in females), and the fecundity of this shark is very low - the female brings only two to four sharks, though very large ones. Their length at birth can reach 1.1 - 1.5 m, and weight between 5-6 kg.
The time of birth is confined to the warm summer season. Females give birth to up to 4-6 cubs. Sharks (more precisely, shark embryos) hatch from eggs while still inside the female. Developing embryos are ovophagi; they will eat the smaller, weaker baby shark embryos while they are in the womb.
On average, young sharks grow 50 cm per year, while adults grow about 10 cm.
Females become sexually mature with a body length of at least 2.6-3.5 m, males - 3.3 m.
Sea foxes are not aggressive and do not pose a threat to human life, but an attack can be provoked. Sharks are shy and difficult to approach. Divers who have encountered these sharks claim they did not act aggressively. Two provoked attacks by these sharks on boats with people are known. The sea fox's large tail can injure divers when attacked.
They have some commercial value, sometimes caught in the by-catch of tuna. Sea fox meat and fins are of good commercial quality. Their skins are used for skin, and the fat from their livers can be used to make a number of vitamins.
The total population of the sea fox is decreasing due to the depletion of fish stocks. Shark abundance in the American Atlantic water has decreased to about 67% of the previous abundance.
About the range, status and abundance of the sea fox in the Mediterranean Sea: Common or frequent species. Throughout the western Mediterranean as far as Sicily; somewhat rarer from southern Tunisia and more and more sporadic further east to Libya and Egypt. Sicilian and Maltese straits - sometimes local abundance. Cosmopolitan in the Ionian Sea, also on both sides of the Adriatic where the sea fox is found along the northern coasts; coast Balkan Peninsula, Aegean Sea, Türkiye, Dodecanese and Cyprus; a rarer species off the coast of Lebanon and Israel.
The fox shark is also known as the sea fox, Latin name Alopias vulpinus.
Distinctive feature of these sharks is the presence of a very long upper lobe of the caudal fin, which is equal to the length of the entire body.
This predator hunts by breaking into a school of fish, right in its middle, waving its tail from side to side, stunning the fish in this way, and then eats them. The back of sharks of this species is painted gray or black, and its belly is light.
According to the method of reproduction, the fox shark is viviparous. This is enough big sharks with a body length of up to 6 meters. Fox sharks are considered dangerous to humans, they often show interest in scuba divers and swimmers. However, there are not so many cases when they attacked people.
reproduction
This shark is also called the "common sea fox" or fox shark.
As already mentioned, these sharks are viviparous. At one time, the female shark is able to give birth to 1-2 sharks. The cubs that were born are very large - about one and a half meters long. Fox sharks reach sexual maturity when their body grows to about 4 meters.
Attitude towards a person
Fox sharks do not pose a great danger to humans, but they show a certain interest in diving divers, spinning around them, but most often not attacking. But there have been cases when these predators attacked boats.
habitats
The habitat of fox sharks is the coastal waters of California, as well as some areas of the Pacific and Indian Oceans. The average size of adults is about 4.7 meters long and weighs about 360 kilograms. One more hallmark These sharks are huge eyes, characteristic of species that live in dark places. In addition, there is the pelagic thresher shark (Alopias pelagicus), which lives in the Indian and Pacific oceans, as well as near the coasts of Western Australia, Taiwan and China and other countries.
The habitat of this fish is quite wide.
In the Atlantic Ocean during the summer, the thresher shark can be found around the Gulf of St. Lawrence and the Lofoten Islands in Northern Norway.
Nutrition
The basis of the diet of fox sharks is small fish and shellfish. Sometimes the largest individuals attack. The meat of the fox sharks themselves is suitable for human consumption, since it is not poisonous. Fox sharks have an excellent appetite, for example, in the stomach of one caught individual, about 4 meters long, 27 large mackerels were found. Sea foxes often hunt in pairs.
As already mentioned, in hunting, the fox shark uses its tail, which stuns a potential victim. Moreover, fish can not always play this role. There is evidence of sharks of this species attacking seabirds floating on the surface of the water with their tails. One precise blow with the tail - and the gaping bird ends up in the mouth of a shark.
Class - Cartilaginous fishes / subclass - Elasmobranchii fishes / Superorder - Sharks (Selach)
Storystudy
The largest sea fox (Alopias vulpinus), its size is 5.5-6 meters, can be found in coastal areas. The smallest pelagic fox shark (Alopias pelagicus) is about 3 meters in size and lives at depths away from the coast. The color is a beautiful dark blue with a whitish belly. It has flat wide pectoral fins. The eyes are larger than those of the common fox, but not the same as those of the big-eyed fox. The most "beautiful" big-eyed fox shark (Alopias superciliosus) has unnaturally large bulging eyes. And what unites all representatives of this family is the possession of a magnificent fox tail.
Spreading
These sharks can be found near California and in parts of the Indian and Pacific Oceans.
The pelagic fox shark (Alopias pelagicus) lives in the Pacific and Indian Oceans. It can also be found off the coast of China, Taiwan, Western Australia and many other countries.
Externalview
Adult thresher sharks measure about 4.7 meters and weigh about 360 kilograms. Outwardly, these sharks stand out with huge eyes, which is typical for individuals that live in dark places.
Structural features
The fox shark has a very long upper lobe of the caudal fin, reaching the length of the entire body.
reproduction
Fox sharks are viviparous. Adult females are capable of giving birth to no more than two sharks. Newborn individuals measure about 1.5 meters. With a body length of about 4 meters, fox sharks reach sexual maturity.
Lifestyle
When hunting, this shark uses its long tail as its main weapon. Approaching a school of fish, the sea fox begins to circle around it, foaming the water with whip-like strokes of the caudal fin. Gradually, the circles become smaller and smaller, and the frightened fish gather in an increasingly compact group. It is then that the shark begins to greedily swallow its prey. A couple of sea foxes sometimes participate in such a hunt. In some cases, the sea fox acts like a flail with its tail fin, using it to stun its prey.
Nutrition
The main food of thresher sharks is small fish and shellfish. Thresher shark (Alopias vulpinus) has a fairly long upper tail fin. It has dimensions commensurate with the size of the body of a shark. The fox shark hunts with its fin. She wedges herself into a flock of fish and begins to beat her tail in different directions, stunning the fish. She then slowly eats her prey. Large individuals often attack even dolphins.
population
Fortunately, it has no commercial value, does not like to settle on the coast, has a formidable weapon and large size - all this helps it a lot not to get into the Red Book.
fox shark and man
Fox sharks are completely harmless to humans, however, during the dive of divers, they revolve around him, although they do not attack. However, there is information that these individuals attacked boats.