In response, at noon today (January 3), the World Conservation Union (IUCN) said on its official microblog that it would update the red list of threatened species in June 2020. According to the current preliminary results, the situation of sturgeon is not very optimistic. IUCN is the worlds largest and oldest global non-profit environmental protection organization.
Research papers on sturgeon. Overall environmental science
The paper called the functional extinction of Acipenser sturgeon
In late December 2019, the international academic journal science of the total environment published a paper from the Yangtze River Fisheries Research Institute of the Chinese Academy of Fishery Sciences, which believed that the unique Chinese species, the white sturgeon, had been functionally extinct in 2005-2010.
The corresponding author of this paper is Wei Wei Wei, chief scientist of China Academy of Fishery Sciences, and the first author is Zhang Hui, researcher of Yangtze River Fishery Research Institute of China Academy of Fishery Sciences. On January 3, reporters of the Beijing News contacted two authors respectively, but no response was received.
According to the paper, no live sturgeon was found in the 2017-2018 Basin wide survey. According to the number of sturgeons found between 1981 and 2003, the researchers estimated that the extinction time was 2005, no later than 2010.
The official microblog of IUCN announced at 12:00 on January 3 that the final results of the ongoing comprehensive assessment of sturgeons in Asia and Europe have not yet been released. It is expected that the red list of threatened species (iucnredlist) will be updated and the assessment results and corresponding level adjustments will be officially released during the World Conservation conference in June 2020. According to the current preliminary results, the situation of sturgeon is not very optimistic.
According to the public information, the white sturgeon is one of the largest freshwater fish in the world, and it is a unique fish in the Yangtze River system and Chinas coastal waters. Previous studies have shown that no trace of the species has been found since 2003.
Not found after 2003
According to the public information, the white sturgeon is one of the largest freshwater fish in the world, and it is a unique fish in the Yangtze River system and Chinas coastal waters. The total length of the largest specimen recorded exceeds 7 meters. It is a kind of predatory fish, which is usually considered as anadromous fish.
Since the middle of the 20th century, due to overfishing and habitat degradation, its number has declined dramatically.
Zhang Minghao, chairman of the Yangtze River Dolphin Conservation Association, mayor of Tongling, Anhui Province, introduced that the white sturgeon is a migratory fish that grows up in the sea and migrates to spawn in fresh water. Human activities, including shipping, illegal fishing and so on, will have an impact on its reproduction and life, and artificial buildings will also hinder its reproduction.
In 1988, the white sturgeon was listed as a national first-class protected animal, and in 2006, it was listed as a seriously endangered species by IUCN, but the decline in its number did not reverse. Zhang explained that at that time, there was not enough attention paid to the protection of the sturgeon, and the funds, equipment and scientific researchers were not up to the current level.
In 2016, Wei Wei and Zhang Hui jointly published a paper on the search for the Yangtze River white sturgeon. This paper shows that there was no observation report for a long time before two white sturgeons were accidentally found near Nanjing and Nanxi in December 2002 and January 2003, respectively.
At an academic conference in 2018, Wei Wei said that since 2003, researchers have not found any more white sturgeons, nor have they survived in artificial breeding.
The Yangtze River white sturgeon, the king of freshwater fish in China, is declared extinct before 2020
According to the international academic journal integrated environmental science, the Yangtze River sturgeon, the king of freshwater fish in China, failed to enter 2020. It is predicted that the Acipenser sinensis will be extinct in 2005-2010.