Animal plant

Chinese sturgeon

Chinese sturgeon (Picture 1)

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Chinese sturgeon is an anadromous fish that spawns and reproduces in the upper reaches of the Yangtze River from October to November each year. Subsequently, the seedlings descended along the river, stopped for a while at the mouth of the Yangtze River, and then developed in the sea. After sexual maturity, the Chinese sturgeon swims back to the Yangtze River and continues to breed offspring, with a round trip path of more than 5,000 kilometers. It is precisely because of this persistent "searching for roots in a thousand miles" habit that people call it "Chinese sturgeon". The Chinese sturgeon has a long life cycle, with a longest life span of 40 years, an average body length of about 40 cm, a maximum length of 200 cm, and a maximum weight of 500 kg. It is China's first-level key protected wild animal, and it is also a living fossil, known as the "water giant panda". It has high scientific research, medicinal and ornamental value. Distributed in China, Japan, South Korea, Lao People's Democratic Republic and North Korea.

The sturgeon fish belonging to the Chinese sturgeon all appeared in the Upper Cretaceous at the end of the Mesozoic, about 140 million years ago. China was discovered in the Late Jurassic in Beipiao, Liaoning (140 million years ago). Fossils of the sturgeon, named Beipiao sturgeon. This type of sturgeon has only one line of lateral scales on both sides of the body, and the other body surface is exposed, which is different from the Chinese sturgeon with five lines of scales. As far back as the Zhou Dynasty more than 1,000 BC, the Chinese called the Chinese sturgeon the king tuna. Chinese sturgeon belongs to the sturgeon form of bony fishes. Sturgeons first appeared in the Early Triassic 230 million years ago and have continued to this day. They are really "living fossils".

In the 1970s, there were more than 10,000 breeding populations in the Yangtze River. In the 1980s, when the Gezhouba River was closed, it dropped to 2176. In 2000, there were only 363. In 2010, it was estimated that only 57 were left. On December 31, 2014, the Institute of Hydrobiology of the Chinese Academy of Sciences, the Yangtze River Fisheries Research Institute of the Chinese Academy of Fishery Sciences, and the Institute of Water Engineering and Ecology of the Chinese Academy of Sciences of the Ministry of Water Resources regrettably ended the 2014 joint monitoring activities for the natural spawning of wild Chinese sturgeons. The monitoring results showed that the natural spawning of wild Chinese sturgeon could not be found. This is also after 2013, the natural spawning of wild Chinese sturgeon has not been monitored again.

Since the closure of the Gezhouba of the Yangtze River in 1981, the Ministry of Agriculture has taken decisive measures. Strictly restrict the number of Chinese sturgeons used for artificial reproduction and scientific experiments, as well as the fishing location and time, protect juvenile Chinese sturgeons along the river and estuary areas, and expand the scale of artificial reproduction and release of Chinese sturgeons. In Yibin City, the upper reaches of the Yangtze River, every year it will go to the Yangtze River. Putting and cultivating Chinese sturgeon fry so that the rare species of Chinese sturgeon can survive and multiply for a long time. China has established three Chinese sturgeon reserves, namely, the Shanghai Yangtze River Estuary Chinese Sturgeon Nature Reserve, the Yichang Chinese Sturgeon Nature Reserve in Hubei Province, and the Chinese Sturgeon Nature Reserve in Dongtai City, Jiangsu Province. Studies have shown that the comprehensive protection of Chinese sturgeon has delayed the decline of Chinese sturgeon resources, basically preserved the anadromous spawning broodstock, and laid the foundation for the natural reproduction, research and proliferation of Chinese sturgeon. Chinese sturgeon species The number has begun to pick up.