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A large fish "extinct in the wild" was found in Huanggang, Hubei Province. It is nearly 1 meter long and has lived for 5 or 6 years.

Time:2022-11-29 16:05:23 source:ucutxmastrees.com author:Small size Read:579次
A large fish "extinct in the wild" was found in Huanggang, Hubei Province. It is nearly 1 meter long and has lived for 5 or 6 years.

The Yangtze River originates from the southwest side of the Geladandong Peak in the Tanggula Mountains on the Qinghai-Tibet Plateau, which is known as the "roof of the world", and finally flows into the East China Sea east of Chongming Island. It is the third longest river in the world. The Yangtze River is also one of the rivers with the richest fish resources in my country. According to incomplete statistics, there are as many as 424 species of freshwater fish in the Yangtze River, including 2 species of cetaceans. Many rare freshwater fish live here. There are three species of sturgeon living in the Yangtze River, namely: Yangtze sturgeon, Chinese sturgeon, and white sturgeon. The previous news that "white sturgeon is extinct" has touched the hearts of countless Chinese people. The "World Conservation Union" updated the Red List of Threatened Species on July 21, 2022, and changed the status of the white sturgeon to "extinct". . In the updated report, the Yangtze sturgeon also appeared, and its status is "extinct in the wild". Extinction and extinction in the wild are two concepts. We often say endangered, critically endangered, and vulnerable, etc., all refer to the endangered level of a species. In 1966, the International Union for Conservation of Nature took the lead in formulating a set of simple and easy-to-accept grading standards, which were widely recognized internationally. It is divided into 9 grades: Not assessed, data deficient, Least Threatened, Near Threatened, Vulnerable, Endangered, Critically Endangered, Extinct in the Wild, Extinct. The further back, the less optimistic the living state is, and when the last level is "extinct", it means that the species has disappeared. "Extinction in the wild" means that there are no wild individuals, but they still exist in the artificial breeding environment, or they must be released into the wild before returning to the wild environment, which is only one step away from extinction.

The Yangtze sturgeon was discovered in Huanggang, and it has lived for 5 or 6 years

Although the reputation of the Yangtze sturgeon is not as good as that of the Chinese sturgeon and the white sturgeon, the It is also a very ancient and rare species, and also has the title of "Water Giant Panda". Although the Yangtze sturgeon was declared extinct in the wild in July 2022, as early as 2000, experts inferred from the monitoring results that the natural reproduction of the Yangtze sturgeon in the wild had stopped, which is really regrettable. Fortunately, a citizen from Tuanfeng County, Huanggang City, Hubei Province was playing on the beach by the Yangtze River recently when he suddenly noticed a big fish on the shoal not far away. The appearance of this big fish is different from that of ordinary fish, and it is not an ordinary fish at first glance. Citizen Mr. Wang usually likes to watch TV. It seems that he has seen this kind of fish on TV. It is a rare animal. When he sensed this signal, Mr. Wang decisively contacted the local fishery administration. After the staff arrived, after preliminary observation, it looked like a kind of sturgeon. You must know that the three species of sturgeon in the Yangtze River are very precious animals, so they rescued them and brought them back to the unit in the water tank. Later, after careful identification by experts, it was confirmed that the fish was the Yangtze River sturgeon, which belongs to the national first-class protected animal. It is somewhat similar to the Chinese sturgeon, and ordinary people may confuse the two. There is a small red dot on the back and tail of this Yangtze sturgeon, which is in good condition and relatively energetic. After measurement, the Yangtze River sturgeon was 96 centimeters long and weighed 4 kilograms. The wild Yangtze sturgeon has a lifespan of about 20 to 30 years. This fish is 5-6 years old and belongs to sub-adults. Judging from the video, it is impossible to tell whether this Yangtze sturgeon was released into the Yangtze River, but it can be concluded that it has lived in the wild for a long time and is in good health. After sampling, the Yangtze sturgeon was reintroduced into the Yangtze River, expecting it to grow and mature, and then reproduce offspring to form a new breeding ground in the middle reaches of the Yangtze River, and finally save the entire species from the brink of extinction in the wild.

340,000 sturgeons have been released, but a stable population in the wild has not yet been established

The Yangtze sturgeon, also known as Dart's sturgeon, is a pure freshwater resident fish with a spindle-shaped body. The pectoral fins are flat at the front, flat at the back, with a tapered snout, small eyes, and large gill slits. The back of the body is gray-brown or gray-black, and the abdomen is yellow-white or milky white. The Yangtze sturgeon is an omnivorous fish, mainly feeding on insect larvae such as Odonata, Mayfly, Chironomidae, and benthic invertebrates in water. The distribution in my country is mainly in the main and tributaries of the Yangtze River, such as the Jialing River, the Tuojiang River, and the Minjiang River. The Yangtze River sturgeon likes to live in the dark bottom slow-flowing water body, and has high requirements on the environment. It adapts to the water temperature of 1-32 degrees Celsius. Although wild Yangtze sturgeon is hard to find, it is fortunate that this species has already been cultivated artificially, and the technology is quite mature. For example, the two bases of the Fisheries Research Institute of the Sichuan Academy of Agricultural Sciences have artificially bred populations of more than 1,000 Yangtze sturgeons. In one of the ponds, there are 3,000 larvae born this year. Some of the fast-growing individuals are physically It is nearly 30 cm long. All of this stems from 20 original species caught from the Yangtze River, of which 18 are in Sichuan. The Yangtze River sturgeon in the base are all descendants of these original species. Many people worry about whether the Yangtze sturgeon will follow the path of the white sturgeon. Facts have proved that the Yangtze sturgeon has been artificially bred, and basically it will not be the next white sturgeon. Since the Yangtze River sturgeon can be bred artificially, people release a large number of Yangtze River sturgeon into the Yangtze River every year, the purpose is to hope that they can establish a stable population in the wild. For example, in 2020, more than 1,400 Yangtze River sturgeons were released in Luzhou; in 2021, 50,000 Yangtze River sturgeons with a body length of more than 30 cm were released in Yibin; in 2022, a release activity on Guangyang Island in Chongqing also released 5,000 fish including the Yangtze River sturgeon were collected. Over the years, people have selected some strong, wild-footed individuals from the breeding environment and released them into the Yangtze River, with a total of 340,000 animals released. But unfortunately, the spawning phenomenon of Yangtze sturgeon has still not been detected in the wild, which means that they still have not been able to establish a stable wild population.

The Yangtze River has been banned from fishing for ten years, and we have hope

It is not an easy task for the Yangtze River sturgeon to establish a stable wild population. The release of the Yangtze River sturgeon The plan will last until 2035. This is a species with high requirements for the environment. In addition to being released into the wild, environmental protection is also a top priority, and the "10-year Yangtze River fishing ban" plan is an opportunity. In order to let the Yangtze River recuperate and prevent the Yangtze River from running out of fish in the end, in January 2020, the Ministry of Agriculture and Rural Affairs of my country issued an announcement on the "Yangtze River Ten-Year Ban on Fishing". Now more than two years have passed, and the results have begun to show gradually. For example, in March and April this year, with the arrival of the peach blossom season, many places in the Yangtze River had piles of fish, so many that they even "dyed" the river water. The increase in the number of fish is not the purpose of the fishing ban. Moreover, the fish that are currently rising rapidly are basically herbivorous fish such as crucian carp and carp that reproduce rapidly. A typical feature of these fish is that they are highly adaptable and reproductive. As long as they rest for a year and a half, their numbers will double. But this is far from enough, because the number of carnivorous animals such as finless porpoise and Chinese sturgeon is far from enough, and the fish in the upper and middle of the food chain are difficult to recover in a short period of time, which is why fishing is banned for ten years. However, we hold out hope that with the passage of time, after the ecology of the Yangtze River is truly restored, the Yangtze River sturgeon is bound to establish a stable wild population. Follow me and make a friend who understands animals.

(责任编辑:Mammal)

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