What is the rarest fish in the world?

Coelacanths, also known as "coelacanths", get their name because of the hollow spine. Since scientists could not find any trace of it in the post-Cretaceous strata, it is believed that this landing hero has said goodbye to the world and is completely extinct. In 1938, one day close to Christmas, a fish was caught near the Comoros Islands in southern Africa that could be used as a "living fossil", and it attracted the attention of the whole world.

This fish is thought to be a coelacanth of the total-fin class (the same species with spike fins) that appeared about 100 million years ago and became extinct 65 million years ago. The fact that total-finned fishes not only breathe air, but also use their fins to walk on their feet, is important evidence of the evolution of fishes into amphibians. In the Devonian period, 400 million years ago, the ancestors of coelacanths climbed onto land with their strong fins.

After a period of struggle, one of them became more and more adapted to life on land and became a true quadruped; The other, having suffered repeated setbacks on land, returned to the sea and found a quiet corner in the ocean, saying goodbye to the land for good.

The so-called coelacanth, it is believed that it first appeared in the Devonian period 100 million years ago, and it was once prosperous and distributed in many places. But it began to decline 100 million years ago, and by the end of the Mesozoic Era, 75 million years ago, it disappeared from the face of the earth, leaving only fossils.

This quiet corner is 11,000 meters deep under the sea. As we all know, it is more difficult for humans to enter the sea than to reach the sky. The first is the tremendous pressure:

For every 10 meters of water depth, the pressure increases by 1 atmosphere. At a depth of 11,000 meters, the pressure will be as high as 1,100 atmospheres, not to mention human flesh and blood, even ordinary steel components will be crushed. There is also the harsh environment of the seabed:

Dark and cold! The sun's rays are quickly absorbed when they enter the sea. At 10 meters, the amount of light energy is only 18 meters above the surface of the ocean, and at a depth of 100 meters, it is only 1.

The light is scarce, the heat is naturally difficult to retain, and the cold and darkness under the water can be imagined. However, coelacanths usually live at very deep depths on the ocean floor and hide themselves in burrows in submarine reefs. In the harsh underwater world, they aim to survive, constantly put pressure on themselves, learn to live with pressure, and survive painfully and happily in the history they have created, surpassing for 400 million years!

Upstairs are the experts. But digression, the question is asked, rare can still be found, specific wild fish, there are many tropical Australian Great Barrier Reef there, some fish are more precious, the most difficult to say, but Thailand's wild Arowana on the Wildlife Red Book, almost extinct, farmed is also very expensive.

The world's top 10 rare marine animals include the Gulf porpoise, dugong, bluefin tuna, blue whale, hawksbill turtle, New Zealand sea lion, yellow-lipped fish, elk coral, leather turtle, freshwater wrasse carp.

1. Jiawan porpoise.

Due to the narrow habitat and habit of warm water areas, fishermen can easily trap them in nets when fishing, coupled with environmental pollution and malicious killing, which has become the main reason for the extinction of the Gulf porpoise.

2. Dugong. Dugongs, known as "mermaids", are very similar to manatees and are currently found mainly in tropical areas. Dugongs are very slow to move, and have high requirements for water quality, and are prone to problems such as pneumonia and ** disease, coupled with human hunting, resulting in dugongs gradually becoming endangered creatures.

3. Bluefin tuna.

Bluefin tuna are mainly found in the Pacific and Atlantic oceans, where they live at different depths and prefer to move in groups. Due to overfishing, bluefin tuna was listed for conservation in 2009 and will soon become extinct if not restricted.

4. Blue whale. The blue whale is currently the largest creature in the world, eating more than 4 tons a day and weighing more than 200 tons at its heaviest. Due to the frequent hunting in the last century, blue whales are an endangered species, and as of now, there are fewer than 50 blue whales in the world.

5. Tortoiseshell. The hawksbill turtle is a sea turtle, its size is relatively large, usually more than a meter, and the forehead is also distributed with scales, due to overfishing has made the hawksbill turtle an endangered marine animal, in China's waters are almost impossible to see this turtle.

6. New Zealand sea lions.

New Zealand sea lions are mainly distributed in the Antarctic Islands of New Zealand, and due to the habitat and hunting problems, they have been upgraded to an endangered species and are included in the Red List of Endangered Species.

7. Yellow-lipped fish.

Yellow-lipped fish is a fish species that only exists in China, and its appearance is very special, and it was listed as an endangered marine animal in 2006 and is a national second-class protected animal.

8. Elk coral.

Mainly found in the Caribbean, elk corals are rare creatures that are difficult to see in other seas and are currently in danger of extinction.

9. Leather turtle. The leather turtle is currently the largest turtle in the world, with a maximum weight of more than 900 kilograms, and is said to have appeared 100 million years ago, and has now become a rare marine animal and is included in the red list of endangered species.

10. Freshwater wrasse.

Freshwater Napoleon wrasse is mainly distributed in Oceania, the Great Barrier Reef and the Red Sea and other seas, this fish is very special, born as a female, at the age of about 9 will transform into a male, now freshwater Napoleon wrasse has been relatively rare, belongs to rare creatures.