sad!Officially announced: extinction!

According to "WWF World Nature Foundation" July 21st

PSephurus Gladius

Eventually was officially announced for extinction

This news rushed to the hot search, causing attention

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At 14:00 on July 21, European time (20:00 Beijing time), the World Nature Conservation Alliance (IUCN) released the global endangered red catalog update report, and 26 existing catfish around the world faced the threat of extinction. List display:

Yangtze -specific species white ravioli has been extinct

ACIENSER DABRYANUS

A. NUDIVIVENTRIS Aral Sea Subpopulation)

The red list also improved the protection level of 7 other catfish.

The results of IUCN global catfish re -evaluation show that about 2/3 of the catfish population is extremely endangered. River and freshwater biological diversity are essential for humans and nature, but global freshwater biological diversity is continuously lost, and the river ecology is constantly degraded.

The report also pointed out that the main threats facing catfish facing them include: illegal trade of wild caviar and fish meat brings illegal fishing, the dams block their migration routes, and unsustainable sand and stone mining destroys them. The spawning field, and the loss of habitat.

The highest level of the red list of IUCN is "extinction", and then in turn, "field extinction", "extremely dangerous", "endangered" and "easy danger". The three -year -old Asian catfish include white ravioli and the Yangtze River. Chinese 持 still maintains the "extremely dangerous" level.

The only member of the IUCN catfish expert group in China and chief scientist at the Chinese Academy of Fisheries Sciences said, "The extinction of the white sturgeon and the extinction of the Yangtze River 鲟 i i 警 警 警 警 警 警 警 警 i i i i i i i i i i i i i."

Dangerous said that the Yangtze River Zhonghua Lang has not monitored natural reproduction for 5 consecutive years, and the survival situation in the wild is worrying. He said that lucky than Bai Yan was that the Yangtze River and Chinese magpies have achieved artificial insurance, but it takes greater efforts to achieve the recovery of natural population.

The last time I discovered the Yangtze River Bai Yan was the first day of the New Year's Day 2003

In December 2019, a research paper published by Dr. Zhang Hui and his student Dr. Zhang Hui in the international academic journal "Overall Environmental Science" revealed that it is expected that the Yangtze River Baiyan will be extinct from 2005 to 2010.

The white tadpole is huge and can reach seven or eight meters long, known as "the king of freshwater fish in China". As the saying goes, "jacks, 10,000 kg." "Lake" refers to Chinese 鲟, "Elephant" refers to the Yangtze River Baiya, which is said to be tens of thousands of pounds.

Like the Yangtze River Chinese Capita, it is one of the very few ancient fish that has been survived by the Middle School of Bai Yan who has been 150 million years ago.

In the 1990s, the injured white ravioli photographed by the Yichang River

On the first day of the New Year's Eve in 2003, the scientist of the Yangtze River Aquatic Research Institute of the China Institute of Aquatic Research was the last time to rescue a Yangtze River Baiji, released and tracking. But then, the ship touched the reef, and the radio wave signal was released by Bai Yan.

No one can think that this may be the last time people discovered the Yangtze River Baiji. Lost this fish and lost the entire species.

Since 2003, scientific researchers have not discovered Baiya, nor do they have artificial breeding individuals. Earlier, people also had a front line. "Some fishermen believe that some waters in the Yangtze River still have white crickets."

The elf in the Yangtze River water was in danger. For the first time, I saw that the Yangtze River Baiji was in 1984, and it was a died white magpie under Gezhouba.

"The individual of white 非常 is very large and it is very difficult to feed." From 1984 to 1993, he rescued 4 trapped Bai Yan, who successfully rescued and returned to the Yangtze River.

Bai Yan in 1993 or has a functional extinction

How does IUCN define the extinction of a species? "In layman's terms, if a species has no natural reproduction and the time limit of the life of this species, no individual can be found during the period, and the species can be determined." In the Golden Shajiang area upstream of the Yangtze River, Bai Yan reproduced naturally after 1991. Before 1993, Bai Yan was caught by mistakes every two or two years, but it has not been discovered for a long time.

In the case of years of monitoring, in the past two years, he and the team have begun to study the current status of Baiji according to the IUCN evaluation model. For functional extinction, that is, natural population cannot be reproduced.

Artificial breeding white ravioli has only lived for 29 days

According to the "Bulletin of the Ecological and Environmental Monitoring of the Three Gorges Engineering of the Yangtze River" issued by the Ministry of Ecology and Environment, it has not been found that Bai Yan live body has been found for 16 consecutive years since 2003.

"As the flagship species of the Yangtze River, the extinction of Baiyu reflects the state of the entire Yangtze River ecosystem." Dangerous said that Bai Yan is a fish traveling fish in the upper reaches of the Yangtze River. Essence In addition, the increase in human activities such as shipping, fishing, and pollution, especially the decrease in the Yangtze River fish, can no longer support the survival of the huge body.

"There are currently no cases of long -term feeding, and there is no retention of artificial breeding." Dangerous said that the longest survival period he had supported was 29 days, which was the tail of the tail of the Nanjing River section in 2002. Why can't Bai Yan achieve artificial reproduction? Explanation of the crisis:

First, the traffic conditions were inconvenient at that time. After receiving the information of the fishermen's misunderstanding, they arrived at the scene.

The second was that the scientific research conditions were limited at that time, and the breeding white pupae needed a pool with a diameter of nearly 20 meters, and the water body was very high, and sufficient oxygen supply was required.

"When we have the ability to understand and help it, it hasn't appeared again." Dangerous said regretfully.

Yangtze River Zhonghua: Natural reproduction has not been found in 5 years

According to the monitoring of the Yangtze River Aquatic Research Institute of the Chinese Academy of Fisheries Sciences, since 2017, the only natural spawning field in China, the lower reaches of the Chinese Capital Reserve in the lower reaches of Gezhouba, has not found signs of natural reproduction of Chinese puppets for 5 consecutive years.

In 2013, the natural reproduction of Chinese crickets at this spawning site appeared for the first time. In 2015, the second interrupt appeared. From 2017 to 2021, there was no natural reproduction for five consecutive years. The ability has been completely lost. In the past 30 years, it has accumulated more than 7 million artificially, but its wild population has naturally unable to recover.

According to the "China Capricorn Rescue Action Plan (2015-2030)", by 2030, the natural population of Chinese crickets must be effectively recovered, and the China -Channel's genetic gene library will be established. The ground environment has improved significantly, the artificial group conservation system is complete, and the group is stable and healthy.

On May 21, 2022, under the initiative of experts such as Danger, the Wuhan Yangtze River Zhonghua Crimine Protection Center was unveiled. This is the speed of Wuhan, which is restored by the Yangtze River, and Hubei, which protects the Chinese magpies.

"To save the Yangtze River Zhonghua, the priority is to connect the tributaries connected to the Yangtze River in Dongting Lake to rebuild the natural life of natural Chinese magpies." Dangerous said.

The protection of Chinese 标 can be divided into three levels: low, medium, and high levels: first, manual or relocated protection and maintenance and maintenance of species continuation; second, natural population can be continued, although the number of populations and geographical distribution is far less than historical level; Third, wild species and habitats and their ecological service functions have been restored and continued.

Dangerous said that at present, Chinese 说 has broken through artificial reproduction and manual reproduction, and preservation species will not be theoretically feasible. However, the long -term sustainability of artificial groups requires the support of natural population inheritance. Therefore, the protection goal of Chinese 鲟 is to ensure the first level of goals and strive to achieve the second level goal. The ultimate purpose is to achieve the third level goal.

Netizens are very distressed

Leave a message

"Protecting the environment is important"

... ...

@茶: So far, it is too important to protect biodiversity.

@The most important thing is to eat: it is sad to see this kind of news

@Williamtung: I hope that there are no extinct animals to protect it well

@啵啵 听: It is sad to hear the word "extinction"

@鸟 咲: No, there is a beautiful species less

@咖 咖: This news is very sad, we are all on the same earth

@The most beautiful durian_COCO: protecting the environment is important

Source: Southern Metropolis Daily, WWF World Nature Foundation, Jimu News, Sina Weibo

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