The Yangtze paddlefish is a species that has only recently become extinct in China. It is a unique species in China, as rare as the giant panda. The difference is that the Yangtze River paddlefish can grow up to 8 meters in length. Among freshwater fish, no one can match, so it is also called "the king of freshwater fish in China".
Although the news of the extinction of the Yangtze River Amur sturgeon was published in the international academic journal "Overall Environmental Science" from June 5438 to October 2020, in fact, researchers have never found the wild Yangtze River Amur sturgeon since 2003.
According to scientific research, the Yangtze sturgeon has lived on the earth for more than 654.38+0.5 billion years. In terms of time, it appeared on the earth earlier than most dinosaurs, and successfully survived the extinction event at the end of Cretaceous and experienced the Great Ice Age. Thus, the viability of the Yangtze sturgeon is beyond doubt.
So why are species that have lived on the earth for more than 100 million years extinct in modern times? Of course, this is inseparable from the "credit" of human beings. Due to the huge size of the Yangtze sturgeon in adulthood, coupled with the rise of the fishing industry in the 20th century, it officially sounded the "death knell" of the Yangtze sturgeon.
In 1980s, due to overfishing, the Yangtze River paddlefish has been listed as a national protected animal, but the commercial fishing in the Yangtze River basin has not stopped. Therefore, it is inevitable that someone will accidentally injure the Yangtze River paddlefish. Overfishing has drastically reduced the number of Yangtze sturgeon, and the construction of a large number of dams has made the rare Yangtze sturgeon more fragmented. Finally, at the beginning of 2 1 century, people never found them again.
The second kind: South China Tiger
Like the Yangtze River paddlefish, the South China Tiger is a unique animal in China. As one of the six subspecies of tigers, the existence of South China Tiger is not only irreplaceable, but also the closest species to its ancestors among all existing tigers.
Although the South China Tiger is supposed to be a "specialty" in the south of China by name, as early as the 20th century, it was once spread all over most provinces in China. However, China has been eyeing tigers since ancient times, not only because tigers are full of treasures, but also because the increasing population has compressed their habitats, resulting in increasingly tense relations between people and tigers.
In this way, since the Qing Dynasty, people at that time have started hunting South China tigers, and all kinds of "tiger-fighting teams" and "tiger-fighting heroes" have emerged constantly. In the 1940s, under several times of encirclement and suppression, according to the data, the South China tigers were compressed from all parts of the country to parts of the south, and the number increased from tens of thousands to about 4,000.
Although the number of tigers in South China had plummeted at that time, their food was gradually not guaranteed as their habitats became smaller and smaller. Thus, in 1957, the "Hundred Tiger Surrounding Villages" broke out in Hunan, which caused a sensation throughout the country. This move has undoubtedly become the fuse for people to kill tigers on a large scale before the ban.
Under the fierce tiger hunting, by 1980s, the number of wild South China tigers in China was only 100. Although in 1977, China has legislated to protect South China tigers, and they all hid in the deep mountains and forests, but driven by interests, poaching activities have not stopped. Finally, in 1994, the last wild South China tiger died under a shotgun, and the South China tiger was officially extinct in the wild.
Compared with the Yangtze River white sturgeon, the South China tiger is better, because in the middle of the 20th century, some wild South China tigers were put into zoos for people to watch. It is this move that has preserved the last blood for the South China Tiger (there are more than 0/00 South China Tigers/KLOC-,all of which are artificially raised and all are descendants of the original 6 South China Tigers).
The third kind: Dianchi salamander
The salamander in Dianchi Lake, as its name implies, is the salamander living in Dianchi Lake, which refers to Kunming Lake in Yunnan. Like the above two species, the salamander in Dianchi Lake is endemic to China. The salamander in Dianchi Lake is only distributed in Dianchi Lake, and its rarity is self-evident.
The salamander in Dianchi Lake is an ancient amphibian. Their body length is usually around 15 cm, and their skin surfaces are moist and smooth. They like to live in the shallow lake area of Dianchi Lake. As early as 1950s, the salamander in Dianchi Lake was a very common amphibian in Dianchi Lake. However, in less than 30 years, the salamanders in Dianchi Lake quickly disappeared.
So, what makes Dianchi salamander disappear quickly? There are three reasons: First, Dianchi Lake experienced a "land reclamation" in the 1970s, which made salamanders who like to live in shallow waters lose most of their habitats; Secondly, since 1950s, more and more factories near Dianchi Lake have polluted its habitat. The third is the development of waterfowl industry near Dianchi Lake (domestic ducks will take the initiative to prey on salamanders), so that the salamanders in Dianchi Lake, which once suffered greatly, were finally completely eliminated.