Species extinct in the Yangtze River Species extinct in the Yangtze River, the Yangtze River is a very important ecological environment, which is rich in ecological resources. As human fishing equipment becomes more and more advanced and environmental problems lead to the extinction of species in the Yangtze River, let's take a look at the extinct species in the Yangtze River. 1 extinct species in the Yangtze river 1. Are there any paddlefish in the Yangtze River? The paddlefish is the "king of freshwater fish", but now it is out of sight. Recently, researchers from the Yangtze River Fisheries Research Institute of the Chinese Academy of Fisheries said in a research paper that it is expected that the paddlefish will be extinct in 2005-20 10. As soon as the news came out yesterday, such a large fish species became extinct when it was said to be extinct? At present, there is no evidence, including imaging, that the paddlefish still exists. The Yangtze River paddlefish, a species endemic to China and a national first-class protected animal, was declared extinct. Since then, there has been no paddlefish in the Yangtze River! 2. What are the extinct species in the Yangtze River? Paddlefish is one of the two existing species of Polypodiaceae. Because its kissing length is like trunk (1/3 of its body length), it is also called elephant trunk fish and Chinese swordfish. It is also one of the largest freshwater fish in the world, and the largest individual is 7 meters long. It was nicknamed "ten thousand catties elephant" by fishermen in the Yangtze River. The paddlefish is the top predator in the aquatic ecosystem of the Yangtze River. Recently, researchers from the Yangtze River Fisheries Research Institute of the Chinese Academy of Fisheries said in their research papers that it is estimated that the paddlefish will be extinct in 2005-20 10. In addition, the baiji (critically endangered, CR, possibly extinct) and the Yangtze River mud carp have been declared extinct, and their extinction time is earlier than that of the paddlefish. 3. Warning from the extinction of the Yangtze River paddlefish: Dr. Wei Qiwei, chief scientist of the Yangtze River Fisheries Research Institute of the Chinese Academy of Fishery Sciences, said: "The Yangtze River paddlefish is the top species in the ecosystem, and its extinction represents that the ecosystem has reached a certain degree of crisis, which has sounded the alarm for us. If we don't protect it, there may be more problems in the Yangtze River ecosystem. " The so-called link is linked by link, so is the ecological chain. The extinction of this species will be implicated in other links and there will be great unknown risks. 4. What other endangered species are there in the Yangtze River? The Yangtze River is a rich resource pool, which has bred countless species, including very old species, whose survival history is many years earlier than that of human beings. However, with the change of natural environment, the number of some species has been very small, while others have become extinct. In the 1988 list of national key protected wild animals approved by the State Council, there are 16 species of rare protected wild fish * *, including the first-class protected animals distributed in the Yangtze River system-ACIPENSER sinensis, ACIPENSER sinensis and ACIPENSER Changjiang, and the second-class protected animals-Myxocyprinus asiaticus, Anguilla japonica and Nibea albiflora. Among these species, the paddlefish has recently been declared extinct, and other species are endangered to varying degrees. Sturgeon all over the world are threatened to varying degrees, and Chinese sturgeon is no exception. The loss of their habitat is the main reason for the sharp decline of population. The wild resources in the Yangtze River are decreasing. What we can do now is to protect the Yangtze River water system, protect ecological resources and provide these species with time to recuperate. On June 5438+1 October1this year, the state implemented a ten-year fishing ban on the Yangtze River, which will help the reproduction and survival of these endangered species.

As one of the mother rivers of China, the Yangtze River is home to more than 4,300 species of aquatic life, including more than 400 species of light fish, which is why it is also called the gene bank of aquatic life in China! But with the rapid development of industry in China, in order to meet the needs of society. Building economical green hydropower station has become the first choice of power generation mode in China. Although human life has indeed become faster, many migratory fish living in the Yangtze River have become extinct! Saury is a typical example. According to the data of Freshwater Research Institute of China Academy of Sciences, the Yangtze River saury resources are very rich in history. 1973, the output of swordfish in the Yangtze river basin alone was as high as 3,750 tons, but in a short period of 10, this value suddenly dropped to 370 tons, while in the 20th century, its output was only about 12 tons, and swordfish production reduction was already very serious. If it is not protected, it will. As a migratory fish, saury enters rivers and their tributaries in groups from February to March every spring. It is precisely because of this feature that many hydropower stations built by blocking rivers have blocked the return route of saury to spawn, which has greatly affected its reproduction. But the main reason is serious water pollution. Due to the random discharge of industrial sewage produced by many small factories along the Yangtze River, the water quality of the Yangtze River has been seriously polluted. The huge environmental pollution not only reduces the ovulation area of saury, but also affects the reproductive system of saury with various heavy metal chemicals, reducing the overall reproductive rate of saury. These subtle influences become more and more obvious with the passage of time! Since ancient times, people in China have studied this matter deeply. As long as any species is served on our table, its situation will become quite dangerous! For example, the popular crayfish is an alien invasive species. When other countries are worried about it, after our chef's cooking, crayfish even appears in short supply! With this contrast, the situation of saury is not difficult to understand. Saury is delicious and deeply loved by Chinese people. As the saying goes, there is no killing without buying and selling. In the huge market, more and more people have joined the ranks of swordfish fishing. With the decreasing number of nets, many young fish are in born to die. Under such a large-scale fishing, even if the number of swordfish doubles, it is doomed to extinction! According to statistics, there are about 50,000 professional fishermen in the Yangtze River Basin, and there are countless part-time fishermen! The way of fishing has also changed from casting nets to using electric hemp. Under such a crushing degree, the fishery resources of the Yangtze River are not only swordfish, but also the scale of other fish species is greatly reduced! The Yangtze fingerling is already very dangerous! The functional extinction of baiji is still vivid, and this kind of event must not be staged again in the Yangtze River basin! Fortunately, our country attaches great importance to the protection of saury. Whether it is the ten-year fishing ban plan or the clean-up of unqualified factories, it will play a certain role in the protection of saury. Grasping this lifeline, saury may be able to show its vitality again in the Yangtze River basin.

Species extinct in the Yangtze River 3 There are 350 species of fish in the whole Yangtze River system, including affiliated lakes, including 324 species of pure freshwater fish, which greatly exceeds the number of freshwater fish in other rivers in China. Some people say that the Yangtze River is an important gene bank of freshwater aquatic organisms in China. Among the fishes in the Yangtze River, CYPRINIDAE is the largest family, accounting for 5 1.7% of the total. The main economic fishes in the Yangtze River include carp, crucian carp, herring, grass carp, silver carp, bighead carp, bream bream and bream bream. In fact, although the Yangtze River is affected by many factors, the hydrological environment has changed greatly. Species extinction is not as easy as we thought, but most of them are species at the top of the food chain. They are highly dependent on the environment, huge and consume a lot of energy. When the natural environment changes, they are the first to become extinct. For example, the Yangtze River paddlefish, with an adult weight of 500 kilograms and a body length of 7 meters, is known as the "10,000-kilogram elephant" in the Yangtze River fishing proverb, which is the highest record of freshwater fish body length in the world. Such a big man is easy to become extinct when the water level of the Yangtze River becomes shallow, the water quality deteriorates and the food source decreases. On the contrary, the extinction of economic fish such as carp, crucian carp, herring, grass carp, silver carp and bighead carp is not so easy. At present, there are six rare and endangered aquatic organisms in the Yangtze River, including baiji, paddlefish, Chinese sturgeon, sturgeon, finless porpoise and mullet. On August 8, 2007, a report was published in the journal Biological Letterhead of the Royal Society, claiming that the baiji, known as the "giant panda in the water", had lived on the earth for more than 20 million years and declared it extinct. However, 1 1 year later, in April of 20 18, an environmental protection team member accidentally photographed the activities of the baiji, indicating that it is not extinct and belongs to an endangered species. From this point of view, the extinct species are still a few, and it is time to ban fishing in the Yangtze River and protect endangered species. What caused the extinction of species? Mainly due to the influence of human activities, the recent decline of aquatic organisms in the Yangtze River is related to the rapid economic development in China and the influence of human production activities. Humans absorb too much material and energy from nature, and more and more wastes are discharged into nature, which not only destroys the ecological balance, but also leads to the deterioration of the ecological environment of fish. In addition, we have not formulated river protection measures suitable for the development of productive forces, and some policies and regulations are lagging behind or not in place. In addition, overfishing, diversification of tools and lack of good fishing season are the main factors leading to species extinction. Whether there is a causal relationship between the Three Gorges of the Yangtze River and Gezhouba Reservoir and the extinction of aquatic organisms is still inconclusive. It does have a great impact on the migration of fish. Among the fish in the Yangtze River, 65,438+00 species are migratory fish crossing the estuary, such as eels and Songjiang perch, Chinese sturgeon and shad. It has a great influence on the upstream migration of Chinese sturgeon and catfish, which is recognized by everyone and reported by many media. We have established a reserve for Chinese sturgeon and white sturgeon juveniles under Gezhouba, and implemented artificial breeding and juvenile release of Chinese sturgeon to supplement the rapid decline of species caused by poor migration, which has played a great role. In the Qing Dynasty, geological disasters such as cliff collapse and landslides occurred in the Three Gorges, which blocked the river course and made it impossible for sturgeon to migrate upstream for more than ten years, but sturgeon did not become extinct. For the extinction of the Yangtze River white sturgeon, most of the reservoirs downstream or on these main tributaries store water to generate electricity, which leads to the decrease of water in the downstream in winter. Sturgeon likes deep water and large aquatic environment, but it can't provide so much water or depth in winter, and its survival is greatly threatened. For surface fish, although the reservoir has caused the "separation of the two places", they are small and have strong adaptability, and will gradually adapt to the upstream migration, and will also find a suitable place to lay eggs in the downstream, which will not have a great impact on them. Objectively speaking, human beings are the biggest natural enemies of fish, and the ten-year fishing ban will make the Yangtze River fish rise! I dare not say that the Yangtze River paddlefish will reappear, but these rare and endangered aquatic creatures will definitely "make a comeback". The recent reappearance of "earth leopard" in North China Plain and "red fox" in Northeast Forest is a good example.