Mention of sharks people are a little afraid, it is also one of the world's largest fish, some time ago popular in China, the box office is also good "Megalodon" must have some friends have seen, the scene inside restores the shark's living environment, as well as the brutal character.
Biologists have discovered one of the longest-lived sharks, the Greenland shark, which has lived on Earth for 512 years, spanning 5 centuries. Greenland sharks are known for their ugly appearance and slow movements, and their shortest lifespan is 272 years. They can grow up to 7.3 meters in length and weigh up to 1.5 tons. In Iceland, the Greenland shark is considered a local ethnic delicacy.
Why can Greenland sharks live so long, according to experts, Greenland sharks reach sexual maturity at the age of 150,160 and begin to reproduce. Females give birth to several baby sharks every few years, similar to whales.
Scientists have not been able to thoroughly study why Greenland sharks live so long. Some have suggested that because they live in environments with very low temperatures, they are also cold-blooded animals themselves. The body temperature and ambient temperature are between -5 ° C and -1 ° C, and the swimming speed is very slow, and they may not eat much, and perhaps they can also conserve energy without spending too much. So, in the end, the metabolism is very slow, which is one reason for its longevity. But then some people raised objections, just the living environment, then the Arctic cod generally does not live to be ten years old, how to explain?
Although the reasons for the longevity of Greenland sharks have yet to be studied, the discovery is of great significance. There is a lot more to explore, such as what is the population of this shark? They swim so slowly, how do they catch their prey? They have such a long lifespan, can they use this to study past environmental changes and the extent of human damage to the oceans, and so on.
Don't look at the Greenland sharks stupid and cute, but they belong to the top of the food chain, mainly dolphins, and also eat polar bears and turtles. The Greenland shark is still a mysterious marine life that cannot be judged to be endangered, but global warming and the destruction of the seabed environment are undoubtedly threatening the survival prospects of this species.
Its life span can reach an astonishing 512 years old, and it must be spiritual to survive for such a long time, so it is necessary to lament that there are many unknown things in the underwater world, which are worth people's continuous exploration.