Ningbo fishermen accidentally caught wild Chinese sturgeon weighing more than 50 kilograms! How is the living condition of Chinese sturgeon?
Release time：2023-02-07 00:35:32 source：korpimaankyynel.com author：Mountains and rivers
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Ningbo fishermen accidentally caught wild Chinese sturgeon weighing more than 50 kilograms! How is the living condition of Chinese sturgeon?
Recently, Shen Wenhuan, a fisherman from Wansheng Village, Simen Town, Yuyao, Ningbo, Zhejiang found that the fishing net was unusually heavy when he went out to sea at night. What was caught was a huge Chinese sturgeon, which was more than 2 meters long and weighed at least 50 kilograms. After confirming that the Chinese sturgeon was not injured, Shen Wenhuan took a video and a photo and reported it to the fishery administrator, and then immediately released the Chinese sturgeon. According to the fisherman, this is the first time he has seen such a large Chinese sturgeon in the more than 30 years he has been in the fishing industry. Since Chinese sturgeon is a national first-class protected animal, he has attached great importance to the protection of rare animals in the country during his decades of fishing career. Whenever a Chinese sturgeon is caught, he will report to the competent department as soon as possible. He will send the fish to a special rescue station for rescue. If the fish is not injured, he will release the fish as soon as possible. Many netizens praised the positive energy displayed by the fisherman. Chinese sturgeon is a large-scale migratory fish. It is a rare and ancient fish species unique to my country. It has a history of 230 million years and lived in the same period as the dinosaur family. Therefore, it is known as the "living fossil of aquatic life". ". With the change of the natural environment, especially the influence of human activities, the population of Chinese sturgeon in my country has shown a "cliff-like" decline. According to relevant data, in the 1970s, the individual weight of Chinese sturgeon in the Yangtze River Basin was about 50 kg. The number can reach more than 400, and the number of spawning and migratory individuals is about 2,100. By 2000, the number of migratory groups had dropped to about 340. Since 2014, the Gezhouba Dam has not been monitored for the first time in the 32 years since the closure of the river. Sturgeon spawns naturally; as of 2017, no natural spawning has been found in the Yangtze River Basin. This is enough to see how endangered the number of wild Chinese sturgeon individuals in my country has shrunk. Judging from the life rules of Chinese sturgeon, it mainly lives in the coastal continental shelf areas of the East China Sea and the South China Sea, and is a fish that grows and develops in the ocean. When the male fish grows to 9-18 years old and the female fish grows to 14-26 years old, they basically reach the first sexual maturity stage. By this time, the mature individuals will travel from the ocean along the Yangtze River in July and August every year. Upward migration, and in the process, with the change of temperature and the impact of water flow, the gonads are further developed and matured. On this basis, Chinese sturgeon will find suitable places in the Yangtze River to mate and lay eggs. Whether the fertilized eggs can hatch successfully in the waters of the Yangtze River has high requirements on factors such as water temperature, water flow, water quality, and oxygen content in the water. However, under the influence of human activities in recent decades, the above factors in the Yangtze River Basin have undergone great changes, which can be summed up in three aspects: one is water pollution, the other is the construction of water conservancy projects, and the third is overfishing. These unfavorable factors will have fatal effects on the gonad development, migration length, hatching of fertilized eggs, and growth and development of juvenile sturgeon. For example, looking at the sperm motility of male Chinese sturgeon, in the last century, the sperm of male Chinese sturgeon survived in water for about 2,600 seconds, but in 2006, it dropped sharply to about 160 seconds. From the perspective of migration space, the furthest migration of Chinese sturgeon in the 1970s was able to reach the area near the upper reaches of the Yangtze River. With the construction of many large water conservancy facilities, the migration space dropped sharply to about 6.5% of the original. In addition, due to changes in the external environment mainly caused by human disturbance, the number of biological populations in the Yangtze River Basin has basically declined significantly, which has also led to the adult Chinese sturgeon migrating and the juvenile Chinese sturgeon in fresh water. During the growth and development of waters, the amount of food becomes less and less, and this problem also affects the sustainable development of the Chinese sturgeon population. In order to protect the Chinese sturgeon, my country has listed the Chinese sturgeon as a national first-class protected animal since 1988, and adopted strict measures to protect it. At the same time, the Chinese Sturgeon Research Institute affiliated to the Three Gorges Group has been committed to the artificial breeding, proliferation and release of Chinese sturgeon for more than 30 years after its establishment to help the Chinese sturgeon in nature to continue the population. Preliminary statistics show that since 1984, The total number of released Chinese sturgeon has reached more than 5 million. Although these measures have delayed the extinction of Chinese sturgeon to a certain extent and promoted the continuation of its population, there is still a long way to go to restore the wild viability of Chinese sturgeon. One of the most important points is that their natural reproductive problems. Under normal circumstances, the number of female Chinese sturgeon eggs is as high as 640,000 per time. However, after the end of the migration period, there are only about 7 individuals that can return to the ocean for smooth growth and development, and only about 7 individuals can return to the Yangtze River to migrate again. Without fundamentally solving the problem of natural reproduction of Chinese sturgeon, relying solely on proliferation and release cannot alleviate its endangered situation. #Fishermen caught a wild Chinese sturgeon of more than 50 kilograms# #中国鲲#
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