Fortunately, the mystery was finally solved. The so-called mysterious animal is just a floating rubber tube. Although this matter has come to an end, people's concern about whether there are "refined" animals in the Three Gorges Dam has not decreased. Next, let's explore the mysterious animals in the Three Gorges Dam.
The Three Gorges Dam is located in the Three Gorges reservoir area, in the eastern Sichuan Basin, in the western Jianghan Plain, in the southern Daba Mountain area, and in the mountainous areas in the northern Wuling Mountains in western Hubei. Of course, the terrain here is not simple.
Because the Three Gorges reservoir area belongs to the humid monsoon climate in the middle subtropical zone, it is warm in winter and hot in summer, and the annual average temperature is maintained in the range of 17 19.
At the same time, this location is the Yangtze River Basin, with a lot of clouds and abundant precipitation. The annual precipitation can reach 1000 1200mm, which means abundant rainfall and heat.
Although the development history of the Three Gorges reservoir area is relatively long, the survival and development of human beings have already changed the original appearance of the reservoir area, leaving traces of human habitation and resource utilization here.
Of course, there are many kinds of animals here, including 384 kinds of vertebrates, including mammals, birds, reptiles, amphibians and so on. So what strange animals are there in the Three Gorges Dam? Then look down.
1, ancient sturgeon
Sturgeon is a cold-water fish, an ancient fish between cartilage and hard bone. It is speculated that the origin of sturgeon may be traced back to the distant Triassic, so sturgeon also has the title of "living fossil". Among the sturgeons, people are most familiar with the Chinese sturgeon and the white sturgeon.
In the waters of the Three Gorges Dam, there are relatively large Chinese sturgeons and white sturgeons, as well as relatively small sturgeons.
These sturgeons need a lot of room to move. Before the dam was built, they usually laid their eggs in the Jinsha River in the upper reaches of the Yangtze River, especially the Chinese sturgeon, which also needed to prey on small miscellaneous fish in the ocean.
The paddlefish used to feed and grow in the middle and lower reaches of the Yangtze River. The current of the Yangtze River is relatively fast, and there are gravel at the bottom of the river, among which sturgeons lay eggs.
Although the construction of the Three Gorges Dam has affected the living environment of these sturgeons to some extent, there are still opportunities to see sturgeons in the waters of the Three Gorges Dam.
2. Endangered finless porpoise
As we know, whales basically live in the ocean, and only a few kinds of dolphins can survive in fresh water and belong to the remains.
However, it is precisely because whales are too big to adapt to the fresh water environment. Even if they can survive, only a few big rivers in the world can satisfy them.
In the Yangtze River valley, both baiji and finless porpoise once lived here. But because of fishing, the baiji dolphin has become extinct and the finless porpoise has become an endangered species.
Because the construction of the Three Gorges Dam is inseparable from the Yangtze River, finless porpoises may also be found in the waters near the Three Gorges Dam.
We can't deny that the water conservancy project has brought great benefits to human life and development, but we can't deny the impact and influence of the construction of the Three Gorges Dam on the water ecosystem.
From a scientific point of view, the dam will produce a barrier effect, which will divide the original continuous river ecosystem into two discontinuous environments.
On the surface, it affects the ecological landscape, but from the perspective of animals, it blocks the migration path of fish. This is undoubtedly a huge impact on some species that need large-scale migration.
Water conservancy projects have a great impact on endangered fish in several tributaries of the Yangtze River. The numbers of sturgeon, mullet, tiger salmon and Qinling salmon are gradually decreasing, but the deeper reason lies in indiscriminate fishing.
This will lead to the miniaturization of fish resources, make large fish resources continuously exhausted, and the materials such as dolphins will be greatly reduced. What we can do is to release fish artificially, carry out ecological dispatch, set up protected areas and ban fishing.
The survival of human beings depends on the natural ecological process, and these "fish, trees and grass" are the raw materials that we can carve out as "treasures" of civilization.
But people should learn to fear nature, and we should take care of the primitiveness, complexity and diversity of nature as much as possible, because this is also the care for human beings themselves.
"refinement" has been banned since the founding of the people's Republic of China, but giant creatures are
There must be.
The water level of the Three Gorges Reservoir 100 meters, with excellent water quality.
Coupled with the policy protection of not allowing free fishing, and
During the ten-year fishing ban on the Yangtze River, there were many kinds of fish.
In the past twenty or thirty years, rest and health care have become numerous.
A paradise for freshwater fish. [China likes it]
Twenty or thirty pounds of fish are rare in ordinary rivers.
Yes Just like the rivers here, there are no fishermen.
It is more common to catch fish of 20 to 30 Jin, 10 Jin or less.
Look, most of them are about two kilograms, but they are in the Three Gorges Reservoir, so
Big fish is the norm. The bigger one weighs 200 Jin.
Not just catfish.
More than 300 kilograms of Chinese sturgeon.
100 kg herring.
You may not imagine these fish just by listening to these figures.
How big is the bottom? If you see the real thing, you will be surprised.
Your eyes sigh the magic of species.
Such a large species can be regarded as an alternative "essence". [praying]
Needless to say, the Three Gorges is such a place. When I was in the fourth grade, there were two big pits in the town. The village Committee pumped the water from the south pit to the north pit with a water pump, and then fished it in the south. God, silver carp and snakehead are so delicate and too big ... when they are all fished out, let's catch some loach and shrimp in the mud.
The Three Gorges Project is one of the most important water conservancy projects on the main stream of the Yangtze River. A concrete gravity dam of more than 2300 meters stands by the river, and the water level in front of the dam rises, forming an artificial reservoir of more than 600 kilometers. With a total area of 1084 square kilometers, the Three Gorges Reservoir is extremely rich in fishery resources and can be called "Yangtze River Fishery Reservoir". On 202 1 year1October 3 1 day, the water level of the Three Gorges Reservoir was successfully filled175m, which was the first consecutive year that the reservoir area successfully completed the water storage task. It should be pointed out that the Three Gorges Project is divided into three stages: cofferdam power generation, initial operation and late operation, in which the symbol of late operation is to achieve the water storage goal of 175 meters. The previous impoundment of175m was a trial impoundment, and this year is the first impoundment after the normal operation period.
The Three Gorges Reservoir has a huge water storage capacity and a rich variety of fish. There is a folk saying that "the water is vast and raises big fish". Many people think that there must be many big fish in the reservoir area. So, how big is the biggest fish in the reservoir?
Three Gorges Reservoir: a veritable "Diaoyutai of the Yangtze River". The Yangtze River is the largest river in China. The complicated river environment and developed water system have bred hundreds of fish species. According to statistics, there are 378 recorded fish species in the Yangtze River Basin, ranking first in the country's rivers and known as the "treasure house of freshwater fish resources". Among them, 147 species are endemic, accounting for 39.4% of the total, with high endemic degree, including flagship species such as ACIPENSER sinensis and ACIPENSER yangtze. The Three Gorges reservoir area is located at the lower end of the upper reaches of the Yangtze River. There are more than 40 species of fish/kloc-0 in the reservoir area, of which 47 species are endemic and rare fish, and more than 30 species are economic fish. Before the fishing ban, the reservoir area has always been an important fishing ground for fishermen in the Three Gorges, especially four kinds of fish, such as big fish, carp and yellow catfish, with a total output of thousands of tons. From 1997 to 200 1 year, the natural catch in the Three Gorges reservoir area reached 1. 1 10,000 tons at the peak, and the minimum catch was 3,208 tons, which was quite gratifying. Nowadays, the Three Gorges reservoir area has fully protected water and fish, banned productive fishing, increased proliferation and release, and further enriched the number of river fish. When the water level reaches 175m, the river flow rate drops from the previous 2m/s to below 0.5m/s, the sediment sinks, the water quality becomes clear, the light transmission conditions become better, and the biological bait becomes more abundant. This change is conducive to improving fishery production, especially to the reproduction of settled fish. On the other hand, the reservoir environment of the Three Gorges Reservoir is also extremely superior. The Three Gorges Reservoir is a canyon-channel reservoir, with mountainous areas to the east and hilly areas to the west of Fengjie. The height difference is wide and the environment is complex, which provides habitats for many kinds of fish. There are many excellent reservoirs and bays in front of the dam, the coastline is long and tortuous, and there are many shoals of aquatic plants, which is very conducive to fish spawning and reproduction. In the Yangtze River basin, sturgeon is the largest kind of fish, and there are only three kinds of native sturgeon in the Yangtze River: Chinese sturgeon, Yangtze sturgeon and paddlefish. Among them, the sturgeon is the largest, weighing more than 1000 Jin, and it is the "Big Mac" in the Yangtze River. For the paddlefish, the ancients called it tuna, and the fishermen in the Yangtze River called it white elephant. The word "elephant" in the fishing proverb "a thousand kilograms of wax is ten thousand kilograms" refers to the paddlefish. At present, the largest sturgeon found is 7.5m long and weighs 907kg, which can be said to be the largest fish in the Yangtze River. The sturgeon caught by fishermen in the Yangtze River is basically between 1 and 3m. In 1970s, a grass carp weighing 14.5kg was found in the stomach of a 3m sturgeon. The paddlefish is the top predator in the Yangtze River, and the title of "King of Freshwater Fish" is well deserved. Unfortunately, the paddlefish has been declared extinct in the wild.
At present, the largest existing fish in the Yangtze River is ACIPENSER sinensis, which is known as the "fish king of the Yangtze River". The length of Chinese sturgeon is generally 1.5~3m, and its weight is 50~300kg. The maximum length can reach about 5m and the weight can reach 600kg, that is,11,000 kg or more. The question now is, is there really an adult Chinese sturgeon in the Three Gorges reservoir area? Acipenser sinensis is a typical upstream migratory fish. Mature parent fish swim upstream along the Yangtze River from offshore, and will not spawn and breed until upstream. Historically, the spawning grounds of ACIPENSER sinensis have been selected in the lower reaches of Jinsha River and the upper reaches of Chongqing, with a range of 600km and more than one spawning ground 10. However, the construction of the dam has brought "fatal injury" to the Chinese sturgeon. In China, Gezhouba was built first, and then the Three Gorges Dam was built. The former ends at 198 1 and the latter ends at 1997. More importantly, Gezhouba is located in the lower reaches of the Three Gorges Dam, and adult Chinese sturgeon must pass through Gezhouba before reaching the Three Gorges Reservoir. In fact, since the completion of Gezhouba, the spawning ground of ACIPENSER sinensis is only 1, which is located in the lower reaches of Gezhouba, and the spawning ground is less than the original 1%. During the breeding period of 20 13, no breeding signs were detected in the lower spawning ground of Gezhouba, and the breeding was interrupted for four consecutive years from 2017 to 2020. Undeniably, the "Yangtze River Fish King" has fallen into a huge crisis, and some experts even assert that the wild Chinese sturgeon will be extinct in the next 10~20 years. Are there adult Chinese sturgeons in the Three Gorges Reservoir? At present, the probability is low. In recent years, a large number of juvenile Chinese sturgeon have been released in China. For example, in April of 20021year, Yichang River released the second generation of Chinese sturgeon 10000, which was the 64th release of Three Gorges Group. According to statistics, the Three Gorges Group has released more than 5 million seedlings, but few of them can really grow into adults. In addition to the Chinese sturgeon, there may be other large fish in the Three Gorges Reservoir. For example, in the Yangtze River tributary of Longgang Scenic Area in Yunyang, many tourists photographed a giant bighead carp that was 3 meters long and estimated to weigh more than 150 kg. The related news report is "Water Monster patrolling the river", but it is not a real hammer at present, because it has not been salvaged. The giant bighead carp weighing 300 kg sounds really incredible, but there are still cases where the real hammer 100 kg or more. In August, 20021,an American man caught a bighead carp weighing 1 14 Jin, breaking the previous record. In China, a bighead carp weighing more than 100 kg was caught when a reservoir in Hunan province was opened, and its age was estimated to be over 30 years old. In the Three Gorges Reservoir, there may be giant bighead carp weighing 100 kilograms. After all, the water surface is wide and the bait is sufficient. With the help of a ten-year fishing ban, the age of bighead carp is expected to reach 20 to 30 years or even higher. Except bighead carp, silver carp, herring and grass carp among the four major fishes are all in good strength. Both herring and grass carp can grow to 1~2m and weigh more than 100kg. In 20 15, a giant herring with a body length of 175cm and a body weight of 180 kg emerged in Qiandao Lake reservoir area. Known by the media as "the king of herring in Qiandao Lake", it is also known as "adult men can be shocked by wagging their tails"! According to Wikipedia, the typical length of silver carp is 60~ 100cm, the maximum length is 140cm, and the weight can reach 100 kg. It can be seen that the four major fish have the strength to impact the rice class and 100 kg! Known as the "tiger in the water", mandarin fish is also a proper giant. 202 1,1/At the beginning of the year, a fisherman caught a giant salamander weighing nearly 100 kilograms in Huangpu River, a tributary of the Yangtze River. Some netizens commented that it was "the failure of Du Jie". Previously, in Danjiangkou, hundreds of pounds of giant salamanders were captured many times, and one of them was made into a specimen. It is concluded that there is no shortage of big fish in the Three Gorges Reservoir. After ten years of fishing ban, there will definitely be more big fish in the reservoir area, and the fishery resources of the Yangtze River are expected to be restored. We will wait and see!