Species: Alopias vulpinus = Common sea fox. Common sea fox Fox find me a group shark

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Big eye fox shark, or big-eyed sea fox, or big eye 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 in the order Lamniformes. It lives in all temperate and tropical waters of the Indian, Pacific and Atlantic oceans. Reaches 4.9 m. Big-eyed fox sharks have an elongated upper lobe of the caudal fin, characteristic of fox sharks. The eyes are very large, in adults up to 10 cm in diameter. They have a streamlined body, a short and pointed snout. Their eyes are adapted to hunting in low light conditions. This is one of the few species of sharks that make vertical migrations during the day. They spend the day in the depths, and at night they rise to the surface to hunt.

Fox sharks hunt using their long tail like a whip. They knock down a school and stun their prey, this explains their English name. thresher shark, which literally translates to “thresher shark.” Reproduction occurs by placental viviparity. There are from 2 to 4 newborns in a litter. Embryos eat unfertilized eggs produced by the mother (oophagy).

Big-eyed fox sharks pose no danger to humans. Their meat and fins are highly prized and the species is subject to commercial and sport fishing. The low reproductive rate makes these sharks very susceptible to overfishing.

Taxonomy



Megachasmidae



Alopiidae




undescribed species Alopias sp.




Alopias superciliosus








The genus was first scientifically described by British biologist Richard Thomas Lowe in 1841, based on a specimen caught off the coast of Madeira in the eastern Atlantic. However, Lowe's description was revised by further researchers, and until the 1940s the species was known as different names, until the capture of several individuals off the coast of Cuba and Venezuela prompted the restoration of the original scientific name.

Generic and specific names come from Greek words. ἀλώπηξ - “fox” and lat. super- “above” and lat. ciliosus- “eyebrow”, which is explained by the presence of obvious supraorbital recesses. These sharks were called fox sharks because of the old belief that they are cunning.

An allozyme analysis carried out in 1995 showed that the most closely related species of the bigeye fox shark is the pelagic fox shark, with which they form a single clade.

Area

Big-eyed fox sharks are common in tropical waters Indo-Pacific and Atlantic Ocean. In the western Atlantic Ocean, they are found from New York to Florida, the Bahamas, off the coast of Cuba, Venezuela and southern Brazil. In the eastern Atlantic, they are found off the coasts of Portugal, Madeira, Senegal, Guinea, Sierra Leone, Angola and the Mediterranean Sea. In the western Indian Ocean, bigeye fox sharks are found off the coast of South Africa, Madagascar and in the Arabian Sea. In the Pacific Ocean, they inhabit the coastal waters of southern Japan, Taiwan, New Caledonia, northwestern Australia, New Zealand, east of Hawaii, southern California. They are also found in the Gulf of California and the Galapagos Islands.

Bigeye fox sharks are found both over the continental shelf and in the open sea. Sometimes they come close to the shore. Although they prefer temperatures between 16 °C and 25 °C, they are found at depths of up to 723 m, where the water temperature does not exceed 5 °C. Little is known about the migrations made by bigeye fox sharks, but there is evidence of migrations made by two tagged sharks. In the first case, migration took place across the Gulf of Mexico over a period of 60 days. The distance traveled by the shark in a straight line was 320 km. The depth at the starting point (the central part of the Gulf of Mexico) was more than 3000 m, and at the final point (150 km south of the Mississippi Delta) about 1000 m. The second shark was tagged off the coast of Kona Coast, Hawaii. The tag was removed off the coast of French Frigate Shoals. The distance traveled in a straight line was 1125 km.

Description

The pectoral fins are long, broad and tapering to rounded tips, with the caudal edge slightly concave. First dorsal moved back compared to other fox sharks and located closer to the base of the ventral fins. The pelvic fins are approximately the same size as the first dorsal fin; males have thin, long pterygopodia. The second dorsal and anal fins are tiny. In front of the caudal fin there are dorsal and ventral crescent-shaped notches. There is a small ventral notch at the edge of the upper lobe. The lower lobe is short but developed.

The color is intense violet or brown-lilac with a metallic tint. After death, the color quickly fades and becomes dull gray. The belly is creamy white. The white coloration does not extend to the base of the pectoral and pelvic fins - this distinguishes pelagic fox sharks from similar fox sharks, which have a spot at the base of the pectoral fins.

Big-eyed fox sharks reach an average length of 3.3-4 m and a mass of 160 kg. The maximum recorded length and weight (4.9 m and 364 kg) had an individual caught near Tutukak, New Zealand, in February 1981.

Biology

The size and location of the eyes of bigeye fox sharks are adapted to searching for the silhouettes of prey in low light conditions. Bigeye fox sharks belong to a small group of sharks that perform daily vertical migrations. They spend the day at a depth of 300-500 m, below the thermocline, where temperatures range from 6 °C to 12 °C, and at night they rise to a depth of 100 m or less. These migrations are due to the fact that sharks hunt at night and hide in the depths from predators during the day. During the day, sharks swim at a measured pace, while at night they make rapid ascents and dives.

Whether bigeye fox sharks have a muscle structure that allows them to retain metabolic body heat energy remains questionable. In a 1971 study, swimming muscles were sampled using a thermistor needle from two bigeye fox sharks. The temperature of muscle tissue was 1.8 °C and 4.3 °C higher than environment. However, an anatomical study conducted in 2005 found that although bigeye fox sharks have aerobic red muscles responsible for generating heat in fox sharks, they are distributed along the sides and located just under the skin rather than deep in the body. In addition, there is no system of countercurrent blood vessels on the sides ( rete mirabile), allowing to reduce the loss of metabolic energy. Based on these two differences, the authors discussed previous findings and concluded that it is likely that bigeye fox sharks are unable to maintain elevated body temperatures. But they have an orbital rete mirabile, which protects the eyes and brain from temperature fluctuations. During daily vertical migrations, temperature fluctuations surrounding water can reach 15-16 °C.

Nutrition

Bigeye fox sharks have larger teeth than other members of the genus. They prey on small schooling fish such as mackerel and herring, demersal fish such as whiting, pelagic fish such as sawtooths and small marlin, squid Lycoteuthidae and Ommastrephidae, and possibly crabs. Like other fox sharks, before attacking, they circle around the school and compact it with blows of their tail. Because of this hunting tactic, they sometimes get caught with their tail on a longline hook or become entangled in a net. The shape of the eye sockets gives bigeye fox sharks binocular vision in the upward direction, which allows them to better see the target. In the Mediterranean Sea they follow schools of mackerel tunas Auxis rochei, probably moving after the largest concentration of prey.

Life cycle

Reproduction in big-eyed fox sharks is not seasonal. They reproduce by ovoviviparity. In a litter there are 2, very rarely 3 or 4 newborns with a length of 1.35-1.4 m. The exact duration of pregnancy is unknown. Fertilization and development of embryos occurs in utero. The embryo is initially fed by the yolk. After the yolk sac is empty, it begins to eat the egg capsules produced by the mother (intrauterine oophagy). The cannibalism characteristic of common sand sharks is not observed in pelagic fox sharks. Externally, newborns are similar to adult sharks, but their heads and eyes are proportionally larger. The inner walls of the oviduct are covered with a thin layer of epithelium from damage by the sharp placoid scales of the embryo. This feature is not observed in other representatives of the fox shark genus.

Males mature at a length of 2.7-2.9 m, which corresponds to an age of 9-10 years, and females at a length of 3.3-3.6 m, which corresponds to an age of 12-14 years. The maximum recorded lifespan for males and females is 19 and 20 years, respectively. Presumably, females produce only 20 sharks in their entire lives.

Human interaction

Despite its large size, the species is considered safe for humans. Divers rarely encounter bigeye fox sharks. The International Shark Attack File does not record a single bigeye fox shark attack on a person.

These sharks are of interest to sport fishermen in the USA, South Africa and New Zealand. They are commercially fished in the United States, Japan, Spain, Brazil, Uruguay and Mexico, and account for up to 10% of the total pelagic shark catch. Off the coast of Cuba, where they are caught by luring them at night using , bigeye fox sharks make up up to 20% of the catch using longlines. They are also important for Taiwan's industrial fisheries, where the annual catch is 220 tons. . The meat comes to market fresh, smoked and salted-dried, although it is not highly valued due to its soft, mushy texture. The hide is tanned for leather, the liver fat is used to make vitamins, and the fins are used to make soup.

In US waters they are caught as bycatch in longlines, trawls and gillnets. In addition, they sometimes get caught in shark nets placed around beaches off the coast of South Africa. Due to their low fertility, members of the fox shark genus are highly susceptible to overfishing. The International Union for Conservation of Nature has listed this bigeye fox shark as Vulnerable.

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Notes

  1. in the FishBase database (English) (Retrieved August 27, 2016).
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  4. Gubanov E. P., Kondyurin V. V., Myagkov N. A. Sharks of the World Ocean: A Guide. - M.: Agropromizdat, 1986. - P. 59. - 272 p.
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  6. Lowe, R. T.(1841). A paper from the Rev. R. T. Lowe, M. A., describing certain new species of Madeiran fishes, and containing additional information relating to those already described. Proceedings of the Zoological Society of London 8 : 36-39.
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  15. Olson, P. D. and Caira, J. N. Two new species of Litobothrium Dailey, 1969 (Cestoda: Litobothriidea) from thresher sharks in the Gulf of California, Mexico, with redescriptions of two species in the genus" (English) // Systematic Parasitology. - 2001. - Vol. 48, no. 3. - P. 159-177. - DOI:.
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  20. Amorim, A., Baum, J., Cailliet, G. M., Clò, S., Clarke, S. C., Fergusson, I., Gonzalez, M., Macias, D., Mancini, P., Mancusi, C., Myers, R., Reardon, M., Trejo, T., Vacchi, M. & Valenti, S.V. 2009. Alopias superciliosus. In: IUCN 2012. IUCN Red List of Threatened Species. Version 2012.2. . Downloaded on 10 January 2013.

Excerpt characterizing the Big-Eyed Fox Shark

Later, having slightly recovered from the shock, Svetodar asked Marsila if she knew about what he saw. And when he heard a positive answer, his soul literally “burst” with tears of happiness - his mother, Golden Maria, was indeed still alive in this land! The very land of Occitania recreated this beautiful woman in itself - “revived” its Magdalene in stone... It was a real creation of love... Only nature was a loving architect.

Tears sparkled in my eyes... And I wasn’t ashamed of it at all. I would give a lot to meet one of them alive!.. Especially Magdalene. What wonderful, ancient Magic burned in the soul of this amazing woman when she created her magical kingdom?! A kingdom in which Knowledge and Understanding ruled, and the backbone of which was Love. Only not the love that the “holy” church shouted about, having worn out this wondrous word to the point that one did not want to hear it any longer, but that beautiful and pure, real and courageous, the only and amazing LOVE, with the name of which powers were born... and with whose name the ancient warriors rushed into battle... with whose name she was born new life... in whose name our world changed and became better... It was this Love that was carried by Golden Maria. And it is this Mary that I would like to bow to... For everything that she carried, for her pure bright LIFE, for her courage and courage, and for Love.
But, unfortunately, it was impossible to do this... She lived centuries ago. And I couldn't be the one who knew her. An incredibly deep, bright sadness suddenly overwhelmed me, and bitter tears flowed in a stream...
- Well, what are you doing, my friend!.. Other sorrows await you! – North exclaimed in surprise. - Please, calm down...
He gently touched my hand and gradually the sadness disappeared. All that was left was bitterness, as if I had lost something bright and dear...
– You can’t relax... War awaits you, Isidora.
– Tell me, Sever, was the teaching of the Cathars called the Teaching of Love because of Magdalene?
“You’re not entirely right here, Isidora.” Those who were not initiated called him the Teaching of Love. For those who understood, it carried a completely different meaning. Listen to the sound of the words, Isidora: love in French sounds like amour - doesn’t it? Now divide this word, separating the letter “a” from it... You get a'mor (a"mort) - without death... This is the true meaning of the teachings of Magdalene - the Teaching of the Immortals. As I told you before - everything It’s simple, Isidora, if you just look and listen correctly... Well, for those who don’t hear, let it remain the Teaching of Love... it’s also beautiful. And there’s still a bit of truth in it.
I stood completely dumbfounded. The Teaching of the Immortals!.. Daaria... So this is what the teaching of Radomir and Magdalene was!.. The North surprised me many times, but never before have I felt so shocked!.. The Teaching of the Cathars attracted me with its powerful, magical power, and I couldn’t forgive myself for not talking about it with the North earlier.
– Tell me, Sever, is there anything left of the Cathar records? Should something have been preserved? Even if not the Perfect Ones themselves, then at least just the disciples? I mean something about them real life and teaching?
– Unfortunately, no, Isidora. The Inquisition destroyed everything, everywhere. Her vassals, by order of the Pope, were even sent to other countries to destroy every manuscript, every remaining piece of birch bark that they could find... We looked for at least something, but we could not save anything.
- Well, what about the people themselves? Could there be something left with people who would preserve it through the centuries?
– I don’t know, Isidora... I think even if someone had some kind of record, it was changed over time. After all, it is human nature to reshape everything in his own way... And especially without understanding it. So hardly anything has been preserved as it was. It's a pity... True, we have preserved the diaries of Radomir and Magdalena, but this was before the creation of the Cathars. Although, I think the teaching has not changed.
– Sorry for my chaotic thoughts and questions, Sever. I see that I lost a lot by not coming to you. But still, I'm still alive. And while I’m breathing, I can still ask you, can’t I? Will you tell me how Svetodar’s life ended? Sorry for interrupting.
North smiled sincerely. He liked my impatience and desire to “have time” to find out. And he continued with pleasure.
After his return, Svetodar lived and taught in Occitania for only two years, Isidora. But these years became the most expensive and happiest years of his wandering life. His days, illuminated by Beloyar’s cheerful laughter, passed in his beloved Montsegur, surrounded by the Perfect Ones, to whom Svetodar honestly and sincerely tried to convey what long years the distant Wanderer taught him.
They gathered in the Temple of the Sun, which increased tenfold the Living Force they needed. And also protected them from unwanted “guests” when someone was going to sneak in there secretly, not wanting to appear openly.
The Temple of the Sun was a specially built tower in Montsegur, which at certain times of the day let direct sunlight through the window, which made the Temple truly magical at that moment. This tower also concentrated and amplified energy, which for those working there at that moment relieved tension and did not require too much effort.

Soon an unexpected and rather funny incident occurred, after which the closest Perfects (and then the rest of the Cathars) began to call Svetodar “fiery.” And this began after, during one of the usual classes, Svetodar, having forgotten himself, completely revealed his high energy Essence to them... As you know, all the Perfect Ones, without exception, were seers. And the appearance of Svetodar’s essence, blazing with fire, caused a real shock among the Perfect ones... Thousands of questions rained down, many of which even Svetodar himself had no answers to. Probably only the Wanderer could answer, but he was inaccessible and distant. Therefore, Svetodar was forced to somehow explain himself to his friends... Whether he succeeded or not is unknown. Only from that very day all the Cathars began to call him the Fiery Teacher.
(The existence of the Fiery Teacher is indeed mentioned in some modern books about Cathar, but, unfortunately, not about the one that was real... Apparently the North was right when he said that people, without understanding, remake everything in their own way.. As they say: “they heard the ringing, but they don’t know where it is”... For example, I found the memoirs of the “last Cathar” Daude Roche, who says that the Fiery Teacher was a certain Steiner (?!)... Again, to the Pure and the Light One is forcibly “implanted” with the people of Israel.... which has never been among the real Qatar).
Two years have passed. Peace and tranquility reigned in Svetodar’s tired soul. Days ran by days, carrying away old sorrows further and further... Little Beloyar, it seemed, was growing by leaps and bounds, becoming smarter and smarter, surpassing all his older friends in this, which greatly pleased Grandfather Svetodar. But on one of these happy, calm days, Svetodar suddenly felt a strange, nagging anxiety... His Gift told him that trouble was knocking on his peaceful door... Nothing seemed to change, nothing happened. But Svetodar’s anxiety grew, poisoning the pleasant moments of complete peace.
One day, Svetodar was walking around the neighborhood with little Beloyar (whose worldly name was Frank) not far from the cave in which almost his entire family died. The weather was wonderful - the day was sunny and warm - and Svetodar’s feet themselves carried him to visit the sad cave... Little Beloyar, as always, picked near the growing wildflowers, and grandfather and great-great-grandson came to worship the place of the dead.
Probably, someone once placed a curse on this cave for his family, otherwise it was impossible to understand how they, so extraordinarily gifted, suddenly for some reason completely lost their sensitivity, precisely when they got only into this cave, and like blind kittens , headed straight into a trap set by someone.
Beloyar, cheerfully chirping his favorite song, suddenly fell silent, as it always happened, as soon as he entered a familiar cave. The boy did not understand what made him behave this way, but as soon as they went inside, all his cheerful mood evaporated somewhere, and only sadness remained in his heart...
- Tell me, grandfather, why did they always kill here? This place is very sad, I “hear” it... Let's get out of here, grandpa! I really don't like it... It always smells like trouble here.
The kid timidly shrugged his shoulders, as if, indeed, sensing some kind of trouble. Svetodar smiled sadly and, hugging the boy tightly, was about to go outside, when four people unfamiliar to him suddenly appeared at the entrance to the cave.
“You weren’t invited here, uninvited.” This is a family sadness, and outsiders are prohibited from entering. “Go in peace,” Svetodar said quietly. He immediately bitterly regretted taking Beloyar with him. The little boy huddled close to his grandfather in fear, apparently feeling something was wrong.
“Well, this is just the right place!” one of the strangers laughed brazenly. – You don’t have to look for anything...
They began to surround the unarmed couple, clearly trying not to get any closer for now.
- Well, servant of the Devil, show us your strength! - the “holy wars” were brave. - What, your horned master isn’t helping?
The strangers deliberately angered themselves, trying not to succumb to fear, since they had apparently heard enough about the incredible power of the Fiery Teacher.
With his left hand, Svetodar easily pushed the baby behind his back, and extended his right hand towards the newcomers, as if blocking the entrance to the cave.
“I warned you, the rest is up to you...” he said sternly. - Leave and nothing bad will happen to you.
The four cackled defiantly. One of them, the tallest, pulled out a narrow knife, brazenly waving it, went at Svetodar... And then Beloyar, with a frightened squeak, twisted out of his grandfather’s hands holding him, and rushed like a bullet towards the man with the knife, began painfully pounding on his knees, caught on the I run like a heavy pebble. The stranger roared in pain and, like a fly, threw the boy away from him. But the trouble was that the “arrivers” were still standing at the very entrance to the cave... And the stranger threw Beloyar precisely towards the entrance... Screaming subtly, the boy turned over his head and flew into the abyss like a light ball... It only took a few short seconds, and Svetodar didn’t have time... Blind with pain, he extended his hand to the man who hit Beloyar - he, without making a sound, flew a couple of steps in the air and crashed his head against the wall, sliding like a heavy bag onto the stone floor. His “partners,” seeing such a sad end to their leader, retreated in a group into the cave. And then, Svetodar made one single mistake... Wanting to see if Beloyar was alive, he moved too close to the cliff and only turned away from the killers for a moment. Immediately one of them, jumping up from behind like lightning, struck him in the back with a sharp kick... Svetodar’s body flew into the abyss following little Beloyar... It was all over. There was nothing else to see. The vile little men, pushing each other, quickly got out of the cave...
Some time later, a small blond head appeared above the cliff at the entrance. The child carefully climbed out onto the edge of the ledge, and seeing that there was no one inside, he sobbed sadly... Apparently, all the wild fear and resentment, and maybe bruises, poured out in a waterfall of tears, washing away what he had experienced... He cried bitterly and for a long time, himself saying to himself, angry and sorry, as if grandfather could hear... as if he could return to save him...
“I told you, this cave is evil!.. I told you... I told you!” - the baby wailed, sobbing convulsively - Why didn’t you listen to me! And what should I do now?.. Where should I go now?..
Tears flowed down his dirty cheeks in a burning stream, tearing his little heart... Beloyar didn’t know if his beloved grandfather was still alive... He didn’t know if the evil people would come back? He was simply terribly scared. And there was no one to calm him down... no one to protect him...
And Svetodar lay motionless at the very bottom of the deep crevice. His wide, clear blue eyes, seeing nothing, looked into the sky. He went far, far away, where Magdalene was waiting for him... and his beloved father with kind Radan... and his little sister Vesta... and his gentle, affectionate Margarita with her daughter Maria... and his unfamiliar granddaughter Tara... And that's it- all those who died long ago defending their native and beloved world from non-humans who called themselves human...
And here, on the ground, in a lonely empty cave, on a round pebble, hunched over, sat a man... He looked very small. And very scared. Bitterly, crying hysterically, he furiously rubbed his angry tears with his fists and swore in his childish soul that the day would come when he grew up, and then he would definitely correct the “wrong” world of adults... He would make it joyful and good! This little man was Beloyar... the great descendant of Radomir and Magdalena. Little, lost in the world big people, crying man...

Everything heard from the lips of the North was flooded into Once again my heart is sad... I asked myself again and again - are all these irreparable losses natural?.. Is there really no way to rid the world of evil and evil?! This whole terrible machine of global murder made the blood run cold, leaving no hope of salvation. But at the same time, a powerful stream of life-giving force flowed from somewhere into my wounded soul, opening every cell in it, every breath to fight traitors, cowards and scoundrels!.. With those who killed the pure and brave, without hesitation, by any means, just to destroy everyone who could be dangerous to them...
– Tell me more, Sever! Please tell me about Qatar... How long did they live without their Guiding Star, without Magdalene?
But for some reason the North suddenly became agitated and answered tensely:
- Forgive me, Isidora, but I think I’ll tell you all this later... I can’t stay here any longer. Please stay strong my friend. Whatever happens, try to be strong...
And, softly melting, he left with a “breath”...
And Caraffa was already standing on the threshold again.
- Well, Isidora, have you thought of something more sensible? – without saying hello, Karaffa began. – I really hope that this week will bring you to your senses and I will not have to resort to the most extreme measures. I told you completely sincerely - I don’t want to harm your beautiful daughter, rather the opposite. I would be glad if Anna continued to study and learn new things. She is still too hot-tempered in her actions and categorical in her judgments, but she has enormous potential. One can only imagine what she would be capable of if he was allowed to open up correctly!.. How do you look at this, Isidora? After all, for this I only need your consent. And then everything will be fine with you again.
- Apart from the death of my husband and father, is it not, Your Holiness? – I asked bitterly.
– Well, it was an unforeseen complication (!..). And you still have Anna, don’t forget that!
– Why should anyone “stay” with me at all, Your Holiness?.. I had a wonderful family, which I loved very much, and which was everything in the world to me! But you destroyed it... just because of an “unforeseen complication,” as you just put it!.. Do living people really not matter to you?!
Caraffa relaxed into a chair and said quite calmly:
“People interest me only to the extent that they obey our holy church. Or how extraordinary and unusual their minds are. But these come across, unfortunately, very rarely. The ordinary crowd doesn't interest me at all! This is a bunch of little thinking meat, which is no longer good for anything other than carrying out someone else's will and someone else's orders, because their brain is not able to comprehend even the most primitive truth.
Even knowing Karaffa, I felt my head spinning with excitement... How was it possible to live thinking like that?!
- Well, what about the gifted?.. You are afraid of them, Your Holiness, aren’t you? Otherwise you wouldn’t have killed them so brutally. Tell me, if you burn them in the end anyway, then why torture them so inhumanely even before they go to the stake? Is the atrocity that you are committing by burning these unfortunates alive not enough for you?..

This species is also known as the common foxfish, fox shark and foxfish. The habitat extends to tropical and temperate waters. In the Atlantic Ocean, these cartilaginous fish live from Newfoundland to Argentina and from the North Sea to the southern tip of Africa. Found in the Mediterranean Sea. In the Indian Ocean they are common in its northern part. And in the Pacific Ocean, the fox shark has chosen a zone from Japan to New Zealand and from British Columbia to Chile.

This species is subject to seasonal migrations. He moves to northern latitudes along with warm masses of water. Moreover, the range of movement of males is wider than that of females. It is assumed that the populations of the Atlantic, Pacific and Indian Oceans have different life cycles. This is indirectly indicated by the fact that there are no migrations from ocean to ocean. Representatives of the species are deep-sea and live at depths of up to 550 meters. Only young sharks are sometimes found near the shore.

Description

The body is streamlined, torpedo-shaped with a short, wide head. The eyes are medium in size and lack urinary membranes. The mouth is small, its shape is curved. There are 35-52 rows of teeth on the upper jaw, and 26-49 such rows on the lower jaw. The teeth are small, triangular in shape, and have no serrations. There are 5 pairs of gill slits.

The main feature of the fox shark is its tail fin. Its upper part is very long and matches the length of the body. With the help of this powerful blade, a predatory fish stuns its prey. The pectoral fins are sickle-shaped. The dorsal fin is relatively high and is located approximately in the middle of the back. There is a tiny second dorsal fin. The pelvic fins are quite large. The skin is covered with protective placoid scales.

The color of the upper body varies from purple-brown to gray. The sides are bluish, the belly is white. In length, including the tail fin, the fox shark reaches 5 meters and weighs 230 kg. The officially registered maximum length is 5.7 meters. The estimated maximum length could reach 6.5 meters. And the heaviest caught was the female. With a body length of 4.8 meters, she weighed 510 kg.

Reproduction and lifespan

This species is ovoviviparous. Pregnancy lasts 9 months. There are from 2 to 7 newborns in a litter. They appear from March to June. They reach a length of 12-16 cm, weigh 5-6 kg and add 50 cm in length every year. Adult fox sharks grow 10 cm per year. Puberty in males occurs at a body length of 3-3.2 meters. Females mature at a length of 2.5-4.5 meters. In the wild, the fox shark lives 15-20 years. The maximum life expectancy reaches 50 years.

Behavior and nutrition

The main diet consists of schooling fish such as mackerel, herring, garfish, anchovies; squid and invertebrates are also eaten. Fish hunting is carried out individually or in groups. Sharks, with their long tails, drive their victims into a dense pile and swallow them. In addition, common fox sharks can use their tails to stifle prey. In this way they attack sea ​​lions and seabirds. However, this happens when there are few fish. If there is a lot of it, then only it is eaten.

Conservation status

At the beginning of the 21st century, this species received the status of vulnerable. This was linked to commercial overfishing. Representatives of the species value their meat and fins. Vitamins are obtained from the liver, and the skin is tanned. Fox sharks are currently protected by law. Catch these cartilaginous fish has decreased, but poachers still cause some damage to this species.

Fox shark - most interesting representative ocean depths. This is a large cartilaginous fish whose body shape resembles a torpedo. The genus includes three species of predators. All of them have characteristic features of body structure and behavior.

What does the name mean?

The genus of sharks received its unusual name due to its long tail, or more precisely, the tip of the caudal fin. The upper segment can account for almost half the entire length of the predator. In addition to its size, the tail has another feature - the elongated lobe of the tail is flexible and movable. The British, having watched the predator hunt, gave it the most accurate name: thresher shark. It literally sounds like “thresher shark.” This is due to the unusual way of hunting.

Unusual hunt

The fox shark does not waste time on trifles: it does not chase individual victims, but prefers an abundant “restaurant” menu. During the hunt, the predator drives the frightened prey into a dense school, crashes into it and begins to “thresh” in different directions long tail. Then he leisurely dines on stunned fish. Considering the size of the predator, one can imagine the power of such a “thresher”. The fishermen who managed to catch the amazing shark complained that the fish, pulled out of its usual environment onto the deck, managed to smash and break with its tail everything it could reach.

Appearance

Since the tail is the most prominent part of this species, descriptions of the predator's appearance almost always begin with it. However, it is worth noting that the fox shark is the most impressive representative of cartilaginous fish. It has an elongated torpedo-shaped body, a wide head and a pointed muzzle. For breathing, the underwater inhabitant has 5 paired gill slits. The two outermost slits are located above the pectoral fins. The fins themselves are pointed and long. The fox shark has a small curved mouth with labial grooves. The predator's teeth are small and their edges are smooth.

The anal and dorsal fins, unlike the caudal fin, are small. There are slight differences in fin sizes and colors among different ones.

Taxonomy of species

The sea fox family is divided into 3 species:

  1. Alopias vulpinus, that is, the common sea fox.
  2. Alopias superciliosus is a deep fox shark called the big-eyed fox.
  3. Alopias pelagicus, a species of pelagic (small-toothed) fox.

In 1995, a fish was discovered in the waters of California, which they wanted to designate as a fourth species, but there was no confirmation of this theory, and the fourth species remained unrecognized.

Main differences. Common fox

It has a streamlined body shape with a clear curve of the back. She has a cone-shaped short head with medium-sized eyes that lack a third eyelid. The predator's teeth are small, fang-like, slightly flattened. The average size of sharks is about five meters. At the same time, a maximum was recorded - more than 7 m, and a minimum - less than four.

The shark's body color is heterogeneous. There were individuals of dark brown, blue-gray, and steel color. Some fish had a black back and a light belly.

Deep sea big-eyed fox

Despite the body structure typical of fox sharks, this representative is easily recognized by the size of its eyes. The big-eyed fox shark fully lives up to its name. In some individuals, the diameter of the eye reaches 10 cm. The peculiarity of the location of the organ in the orbit allows the predator to see not only in front and to the sides, but also to view the space above its head.

Another distinctive feature of the species is its special lateral grooves. They are formed at the junction of the body and the head, passing over the gill slits and eye sockets.

The teeth of the bigeye fox shark are larger than those of other species. They have one apex and are the same size on the upper and lower jaws.

The body color is brownish-violet, the belly is always lighter than the back. The dorsal fin is shifted towards the tail.

Pelagic fox

The color is dark: most often these are various shades of blue and gray colors. The shark's belly is much lighter.

The species has well-developed pectoral, caudal and dorsal fins. But at the same time, the second dorsal and anal fin are very small. The elongated lobe of the tail is narrower than in other species.

Habitat and diet

The fox shark has a wide range. It is found in the tropics and temperate latitudes. The pelagic species is characterized by an existence remote from coastlines. This species lives in surface layers and at depths up to 150 m.

The big-eyed fox prefers more serious depth. She is comfortable 500 m below the surface.

They love coastal zone, but they feel good and are far from the ground. This species prefers surface layers, but can dive up to 500 meters.

Fox sharks do not attack too large prey, since the basis of their diet is schooling fish. We have already talked about the hunting habits of this genus, but this does not mean that predators cannot make exceptions. In the absence of schools of fish, the diet of the fox shark can include any living creature. The person, most likely, will simply be stunned by the tail - the shark will not dare to dine on such an unpredictable enemy.

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Fox shark(second name “sea fox”, Latin name “Alopias vulpinus”) is a species of sea shark that belongs to the family Fox sharks, order Lamniformes.

Signs
Sea foxes are large sharks with an average body length of 3 meters; specimens up to 5 meters long are known. The upper part of the body is dark gray-blue, the belly is white. Average weight Fox sharks weigh 300 kilograms (maximum weight is 500 kilograms).

Distinctive sign sea ​​foxes are their caudal fin, the upper blade of which is incredibly large, sometimes exceeding the length of the body of the fish itself. This tail is necessary for fish to hunt. Ichthyologists claim that the sea fox is capable of stunning schools of fish and even birds and small birds with its tail ladle. marine mammals. In search of food, the shark rises to the surface of the water and, seeing potential food, strikes the sea surface with its tail fin.

Habitat

Fox sharks inhabit the Pacific and Atlantic oceans. They prefer to stay in tropical waters, but often swim into waters of temperate latitudes.

Danger!!!

This type of shark does not pose a great danger to humans. However, cases of attacks by these sharks on people have been described. Sea foxes usually hunt collectively, that is, they gather in groups of 3-5 individuals and surround schools of fish, drown them with their tails, and then all together rush to the center of the fish cluster. It is during moments of collective hunting that fox sharks are most dangerous. During the chase, they rush after any moving object in the water.

Even in the depths of the sea there are workers who honestly “earn” their bread, that is, fish, fox shark or sea fox (Alopias).

Despite its large dimensions, the fox shark has no particular desire to attack a person, since it feeds on schooling fish, but if it is really hungry, it will chase after swimming invertebrates and even.

How does a fox shark hunt?

The fox shark is famous for its tail and the way it uses it: after tracking down a school of fish such as mackerel, mackerel, herring and other prey, the shark begins to circle, gradually disorganizing the prey.

With each revolution, the ring narrows, the fish huddles together, loses orientation, and the time comes to use the tail for its intended purpose: like a flail on a thresher, the shark methodically stuns the fish, after which you can calmly proceed to dinner - the stunned prey will not go anywhere for some time.

Watch video - Fox shark hunting:

Now it is clear English name fox shark (thresher shark) – thresher shark. One problem is that you need to eat a lot and at once - it is not known when luck will smile again.

The one glorified in legends comes to the rescue: the shark regurgitates what has already been chewed and greedily pounces on a new portion.

Why was the shark called a fox?

For work, that is, for food, the fox shark uses its unsurpassed tail, which, on average, occupies half the body length of the sea shark. Accordingly, if the length of a predator is 5-6 meters, then the length of the tail is 2.5-3 meters.

This is a truly formidable weapon, consisting of a greatly elongated upper caudal lobe (the lower lobe is almost atrophied), which arises 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 at the back. The head is small, wide and short.

The mouth is small; crescent-shaped mouth opening; , form rows, sometimes up to 20. The eyes, depending on the species, can be normal or very large. Five small gill slits, and squirt flaps may be absent.

The color is different (do not forget that there are three species 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.

Lives almost everywhere: in the Pacific, Indian and Atlantic Oceans, in almost all tropical and subtropical sea waters.

Puberty occurs at a certain height, on average 4 meters. Quite often they live not alone, but in twos: it is believed that for joint hunting it is easier to find a school of fish and easier to suppress, working in two tails.

Watch the video - Fox shark fighting tail:

Fox shark, brings 2-4 sharks per litter. During the breeding season, it moves closer to the coast, where it stays for several months, monitoring how the water temperature affects the growing offspring.

Fortunately, the predator has no commercial value, does not like to settle on the coast, has formidable weapons and large size - all this greatly helps it not to be included in the Red Book.

True, fishermen are not very fond of the sea fox breed - while hunting for schools of fish, sea foxes get caught in nets and tear them mercilessly. Therefore, fishermen are happy to use a caught shark as bait for other fish.

The largest is the common sea fox (Alopias vulpinus), its size is 5.5-6 meters, and can be found in coastal areas.

The smallest is the pelagic fox shark (Alopias pelagicus), measuring about 3 meters, and lives in the depths away from the shore. The color is a beautiful dark blue with a whitish belly. It has smooth, wide pectoral fins.

The second species has larger eyes than the common fox, but not the same size as the big-eyed fox.

The most “beautiful” big-eyed fox shark (Alopias superciliosus) has unnaturally large bulging eyes.

And all representatives of this family are united by the possession of a magnificent fox tail!



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