Is the Yangtze River sturgeon extinct? Expert: its normal to see you in 20 or 30 years

category:Society
 Is the Yangtze River sturgeon extinct? Expert: its normal to see you in 20 or 30 years


u25b3 screenshot of the paper one of the worlds largest freshwater fish may be extinct: urgent to save endangered fish in the Yangtze River

Is the Yangtze River sturgeon really farewell to us? Its not settled yet! The reporter of Modern Express contacted and interviewed the two authors of the paper for the first time. They all said that the living bodies of the Yangtze River white sturgeon have not been seen for more than ten years, but it is normal to see them again 20 or 30 years later.

Experts said: in 2005-2010, the Yangtze River white sturgeon may be extinct

A few days ago, the famous international academic journal Integrated Environmental Science published online research papers by Wei Qiwei, researcher of Yangtze River Fisheries Research Institute of China Academy of Fishery Sciences and Zhang Hui, Ph.D.

In the paper, one of the worlds largest freshwater fish may be extinct: it is urgent to save endangered fish in the Yangtze River, experts said that the Yangtze River sturgeon is expected to be extinct by 2005-2010.

u25b3 history of sturgeon displayed in the paper (provided by the author)

Wei Qiwei has studied the Yangtze River white sturgeon for most of his life. On November 4, 2018, at the sub forum of aquatic wildlife protection of the Yangtze River Biological Resources Protection Forum held in Wuhan, Wei Qiwei disclosed in his report that the white sturgeon may have been extinct, and experts are evaluating this situation.

In September 2019, the international organization IUCN (World Conservation Union) reported at an academic annual meeting in Qiandao Lake, Zhejiang province that, according to the assessment of the expert group, the Yangtze River white sturgeon, an endemic species of China and a key national protected animal, was extinct.

According to IUCN experts, at present, there is no evidence, including imaging, to prove that the Acipenser sturgeon still exists. If people capture or capture any individual of the Yangtze River Acipenser, IUCN will reconsider the adjustment of its species endangered level.

Wei Wei and Zhang Hui attended the meeting. People respect IUCNs evaluation model and experts, but the result is very heavy, Zhang said

Lived 150 million years, last seen in 2003

u25b3 sturgeon stamps (official website of China Post)

A thousand catties of wax, a thousand catties of elephant..

Wax refers to the Chinese sturgeon, and elephant refers to the Yangtze River white sturgeon. It is said that it can grow to tens of thousands of Jin and is very big. It is called water tiger and king of Chinese freshwater fish.

Like the Chinese sturgeon, the Yangtze River white sturgeon has lived for 150 million years. The sturgeon is a little weird, but a little cute. The long mouth (snout), like a long sword, is a bit similar to the common swordfish. The body is full and round. There is only a series of spiny scales on the upper edge of the tail fin. The whole body is in a high-level gray purple color.

In fact, the Acipenser Acipenser is very rare and mysterious. Few people have seen it. Zhang Hui, the first author of the paper and Ph.D. of the Yangtze River Fisheries Research Institute of the Chinese Academy of Fishery Sciences, told the modern express, I studied the sturgeon with Mr. Wei Wei Wei Wei Wei Wei Wei Wei Wei Wei Wei Wei Wei Wei Wei Wei Wei Wei Wei Wei Wei Wei Wei Wei Wei Wei Wei Wei Wei Wei Wei Wei Wei Wei Wei Wei Wei Wei Wei Wei Wei Wei Wei Wei Wei Wei Wei Wei Wei Wei Wei Wei Wei Wei Wei Wei Wei

The first time Wei saw the Yangtze River sturgeon was in 1984, a dead one under Gezhouba. The sturgeon is big and very difficult to feed. From 1984 to 1993, he rescued four trapped sturgeons, only one of which was successfully rescued and put back to the Yangtze River.

The final appearance of the sturgeon is the first day of the new year in 2003. On January 23 that year, experts from the Yangtze River Fisheries Research Institute of the Chinese Academy of Fisheries rescued a white sturgeon in the Nanxi River section of Yibin, Sichuan Province. After that, experts installed ultrasonic trackers for the paddlefish to release the Yangtze River, but the speed of the flow in the Yibin river section was too high, and with the beach risk, the tracking ship lost its signal after hitting the reef. After the tracking ship was repaired, the signal could not be found again.

18 years ago, a white sturgeon was rescued in Xiaguan, Nanjing

u25b3 sturgeon found in Xiaguan District, Nanjing

The Yangtze River white sturgeon can swallow six or seven Jin of grass carp in one breath in its foraging. Zhang Hui told the modern express that the number of sturgeons is so small, which is also related to its rebellious character. The stress response of Acipenser schrenckii is strong and easy to be injured.

Among the four white sturgeons rescued by weiqi, there is one in Nanjing. On December 11, 2002, Laosun, a fisherman in laoxiaguan, fished in the Jiangxinzhou area under the Nanjing Yangtze River Bridge and caught a strange fish. It has a long mouth, a sharp mouth and a flat body. Strange fish also has several rolling hooks and several old wounds. Old sun had never seen such a fish before, and he soon reported it to the Fisheries Department in Nanjing.

And after the staff of fishery administration department looked at it, another call came to Changjiang Fishery Research Institute of China Academy of Fishery Sciences. Wei Wei, who received the call, rushed from Hubei to Nanjing. Seeing the bruised sturgeon, Wei Wei and others rescued the sturgeon, sewed up the body surface trauma of the sturgeon, and injected anti-inflammatory and rehabilitation injection.

Experts speculate that the white sturgeon is 3.3 meters long and weighs about 130 kg, aged between 15 and 20. According to the age of sturgeon, it has entered middle age. In addition, judging from the appearance and morphology of the reproductive pores, the white sturgeon tends to be female, but there is no sign of reproduction. As the normal living area of the white sturgeon is about 3800km away from Nanjing, it can be inferred from the injury that it arrived at the Nanjing river section downstream after breaking away from the fishing net of the rolling hook in the upper reaches of the Yangtze River.

Later, the white sturgeon was transported to the oriental culture research base of Chinese sturgeon in Kunshan. The white sturgeon lived there for more than 20 days and died.

[questioning

Will it appear in the future? Be on the cards

On January 3, the Yangtze River sturgeon became extinct and was searched by microblog. Netizens all regretted it. Has the Yangtze River sturgeon really been removed from the biological household register? In an interview with the media, the staff of the China Representative Office of the World Conservation Union said that at present, the IUCN official has not released and updated the news about the extinction of the Yangtze River sturgeon, and there is still a need for further discussion. IUCN has its own point of view, and our paper is our point of view, Wei Wei told the modern express

So, is it possible for the Yangtze River sturgeon to see you again? It is possible, Zhang said. A similar situation has occurred abroad. There were once creatures that had been declared extinct. After decades, they were found again. In fact, the Yangtze River white sturgeon has always been very rare, and it is difficult to find it when living underwater. So its a normal phenomenon if we find it again in 20 or 30 years. We also use the data model to deduce this one.

(function() {(window. Slotbydup = window. Slotbydup| []). Push ({ID: u5811557, container: ssp_, async: true});}) ()); source of this article: responsible editor of Modern Express: Li Chao