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A sturgeon floating in the waters of Chongming, Shanghai, confirmed to be a wild Chinese sturgeon, the cause of death is unknown

Time:2023-02-03 10:14:57 source:ucutxmastrees.com author:Birds Read:368次
A sturgeon floating in the waters of Chongming, Shanghai, confirmed to be a wild Chinese sturgeon, the cause of death is unknown

#HeaderCreationChallenge# In July 2022, in the sturgeon report published by the International Union for Conservation of Nature, the survival status of 26 species of sturgeon species in the world, about two-thirds of which are critically endangered, The three species of sturgeon living in the Yangtze River cannot escape the threat of survival. The Yangtze River white sturgeon has been officially declared extinct, the Yangtze River sturgeon is extinct in the wild, and the Chinese sturgeon is critically endangered. 1. A wild Chinese sturgeon appeared in the waters of Chongming, Shanghai. Recently, in the waters near Chongming, Shanghai, some citizens found a strange fish floating on the water. It was suspected to be a sturgeon. Citizens quickly called the police, and the police also quickly contacted the Fisheries Administration and the Aquatic Wildlife Conservation Research Center to arrive at the scene. After confirmation by the staff: this strange fish belongs to the Chinese sturgeon, with a total length of 94 cm, a weight of about 3 kg, and a fish age of about 2-3 years. When it was salvaged, the sturgeon had a rotten and stinky smell. After another machine test, this wild Chinese sturgeon has been dead for a long time. As for the cause of death, it is temporarily unknown, and more research is needed. The wild Chinese sturgeon is a national first-class protected animal and a key protected wild animal. Although this sturgeon has died, it still has a lot of research significance. Therefore, first of all, according to the regulations, the alarm person who reflects the situation will be rewarded. At the same time, the staff Bring it back to the laboratory for scientific research, in order to obtain more information and data on this Chinese sturgeon, whether it belongs to the artificially farmed "wild" Chinese sturgeon, or is originally a wild population, which is very important for the protection of the Chinese sturgeon population. White sturgeon, Yangtze sturgeon, and Chinese sturgeon are all native species in the Yangtze River basin, but the white sturgeon has been officially declared extinct, the Yangtze River sturgeon has been officially declared extinct in the wild, and the Chinese sturgeon is a critically endangered species, which is a serious blow to the endemic sturgeon. It is easy to think that the Yangtze sturgeon is the next white sturgeon, but on September 6, a rare sturgeon was found in Hubei-the Yangtze River sturgeon, which is 96 cm long and weighs about 4 kg. The age of the fish is about 5-6 years old. It is a sub-adult of the Yangtze sturgeon, and it can reproduce in 2-3 years. The wild Yangtze sturgeon reappeared. This is because the extinction in the wild does not mean that the species has disappeared, but that these species have not been found in the wild. They have stopped natural reproduction, and there is no data to record their traces. In a place, and the cultivated Yangtze sturgeon is relatively mature, these Yangtze sturgeon will be released back to the Yangtze River in the wild. Although the survival rate is relatively low, there is always a chance to re-adapt and slowly establish its population. 2. The re-establishment of wild populations of Chinese sturgeon The Chinese sturgeon and the Yangtze River sturgeon are becoming less and less, because they are a kind of upstream fish. The biggest difficulty encountered by upstream fish is that humans built dams and changed the direction of the river. , human factors such as hydropower engineering, shipping, fishing, pollution, etc., make the survival of these sturgeons encounter great challenges. According to statistics, in the 1970s, the breeding population of wild Chinese sturgeon in the Yangtze River could reach more than 10,000, but in the 1980s when the Gezhouba was closed, it dropped sharply to 2,176, and in 2000, there were only 363, and it was estimated in 2010. There are only 57 animals left. In 2013, the wild Chinese sturgeon stopped spawning naturally. This is a danger signal for the Chinese sturgeon. No natural breeding activities have occurred, which may mean that the wild Chinese sturgeon population is in danger of extinction. In order to save the Chinese sturgeon and compensate for the adverse impact of the dam project on the Chinese sturgeon, more than 5 million Chinese sturgeon have been released in the past few decades, but it is still difficult to cultivate the Chinese sturgeon into the wild Chinese sturgeon. Ecological joint renovation is also being carried out to open up more habitats for Chinese sturgeon! In particular, in order to protect the natural waters of the main stream of the Yangtze River and important tributaries, except for the aquatic nature reserves and aquatic germplasm resource reserves, the Yangtze River waters will be banned for ten years on January 1, 2020, during which productive fishing of natural fishery resources will be prohibited. There are more and more fish of all kinds. It is believed that endemic species such as Chinese sturgeon and Yangtze River sturgeon will also re-establish their wild populations, and even some rarer species will return. Pay attention to the six-dimensional nature and let the flow know nature!

(责任编辑:Bird)

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