Sharks polar live more than 400 years. It is the most long-lived vertebrates on Earth – Gazeta Wyborcza

 
 
 
 
 
 
 
 
 
 
 
 
 
 
    
 
 
 
 
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polar shark photographed in the fjord Uummanna in north-west Greenland (Julius Niels)

                  
                  
                  

                  
             

             
         
     
   
   
   
 
 
 
 

Do you dream to live for hundreds? Sharks Greenland in this century are rookies, they are still sexually immature. Most live to a ripe old age with all vertebrates in the world - proved just scientists.

 
 
 
 
 
 
 
 
 
 
 
 
 
                          
 

                 

 

 
 
 
 
 
 
 
 
 
 
 
 
 
 

         

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Greenland is the largest island on Earth. Today, the same as centuries ago inhabited it mainly Inuit, but it was once also home to the famous Vikings. It turns out that the oldest living today whale sharks may have witnessed how in the seventeenth century on the island arrived English, Dutch and German whalers to bind and prepare to transport the whales killed. And if these venerable sharks could also briefly look inland, zobaczyłyby as Jan III Sobieski's victory at Vienna in 1683. Scholars say because in today's "Science", that the Greenland shark is the most long-lived vertebrate on Earth. As evidenced by field research, the oldest studied by scholars individuals have nearly ... 400 years! A sexually mature animals they reach the age of only about 150 years.

Greenland Shark ( Somniosus microcephalus ), also called polar lives in the North Atlantic. Adults reach a length of 4 to 5 m, making this the largest species of fish Arctic waters. Females surpass males.

Until now we knew little of their biology, it was clear, however, that these fish grow very slowly - about 1 cm per year. It was a hint that there may be long-lived.

The traditional method of determining the age of a species include the most common analysis of calcified tissues. But the shark does not have such tissues, so the researchers could not determine how many years the individual has. To finally come to grips with this problem, Dr. Julius Nielsen and his colleagues section of marine biology at the University of Copenhagen used a technique dating eye lens. They used to 28 females that tangled in fishing net.

Scientists have studied the nucleus of the eye lens, which is formed already during fetal development and is therefore as old as the same shark. This unique feature of the lens has already been used to determine the age of other vertebrates. It turned out that the average life expectancy studied sharks is 272 years. The two largest females (measuring respectively 493 cm and 502 cm) survived by these analyzes 335 and 392 years!

From this it follows that sharks polar are now the longest-living species of vertebrates on Earth.

They live whale Greenland ( Balaena mysticetus ), whose average life expectancy is approx. 210 years, but disappear cyprinie Icelandic - deep-sea mussel species, the longest-living person reached the age of 507 years. Scholars give Cyprin as an example of the body of negligible aging, almost immortal.

A polar sharks live long and slow - in comparison to body size swimming the slowest of all fish examined so far. Wandering herds. And as befits sharks are carnivorous. They prey on fish and marine mammals (eg. The seals likely to fall prey to them when they rest and sleep in the water). Do not despise a land prey - in the stomach Greenland sharks were found the remains of reindeer and polar bears ...!

According to the old nomenclature are jajożyworodne (today this is called żyworodnością lecytotroficzną). This means that after internal fertilization embryos remain in the membranes of the egg inside the mother's body and nourish the egg yolk. Young released from membranes of egg laying eggs immediately before, during or immediately after their submission by the female. At the time of the birth of small rekinki are over 60 cm long.

polar Sharks were once harvested en masse because extracted from the liver oil. Raw meat of this fish is toxic, only dried suitable to eat. Today their existence is not threatened, but if further degrade the environment, is born today, individuals will no longer have a chance to live XXV century.

         

         

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Comments (9)

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                               "He was gaining ground when Shakespeare died."
  Can still remember him?
                             
                           
                         

  
   
   
   
   

  
   
   

   

 
 
 
 
 

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   tryputznick
   
   

  
    an hour ago

  
   
   

                           
                             
                             
                               One such fish could devour the citizens of all four rzeczpospolitych. Szyszko has to do with the order.
                             
                           
                         

  
   
   
   
   

  
   
   

   

 
 
 
 
 

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   tryputznick
   
   

  
    an hour ago

  
   
   

                           
                             
                             
                               Duck to cross. And after 50 years to introduce getting up from his knees as Olympic discipline. And who forbid us?
                             
                           
                         

  
   
   
   
   

  
   
   

   

 
 
 
 
 

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                               Me very curious as scholars agree that the mussel has 507 years, not np.508?
                             
                           
                         

  
   
   
   
   

  
   
   

   

 
 
 
 
 

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                               The prophets of the Bible lived over tysac years so gernlandzkie whales did not impress us.
                             
                           
                         

  
   
   
   
   

  
   
   

   

 
 
 
 
 

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                               At the eye can see, that lead a long and exciting life.
                             
                           
                         

  
   
   
   
   

  
   
   

   

 
 
 
 
 

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   inkwizytorstarszy
   
   

  
    10 hours ago

  
   
   

                           
                             
                             
                               Perhaps it is worth carefully check the construction of their DNA? Is
  in its construction they are not dipped their fingers those who left the virtual holographic plans to build a pyramid to commemorate consecutive
  ... Interesting that nowhere found any plans of designers and builders of the pyramids .
  had stored in memory?
                             
                           
                         

  
   
   
   
   

  
   
   

   

 
 
 

To assess Login or zarejestrujX

 

 
 
 

 
 

 
 

 
   
 
 
 
 

 
 

 
 

 
 
 
 
 
 
 
 
 
 

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