There are huge fish in the Yangtze River, the largest and longest of which is the Yangtze River paddlefish, which was officially declared extinct two years ago. At present, the largest freshwater fish is ACIPENSER sinensis, which can reach 500 Jin at its heaviest. There is also a kind of fish with a particularly strange shape in the Yangtze River, called sticky carp, which has a nice name. These are extinct or endangered animals in the Yangtze River basin.
The Three Gorges Dam, located in the Three Gorges Dam Tourist Area of Sandouping Town, Yiling District, Yichang City, Hubei Province, is located in the Xilingxia reach of the main stream of the Yangtze River, at the eastern end of the Three Gorges Reservoir, with a control basin area of about 6,543,800 square kilometers. Built in 1994, it integrates flood control, power generation, shipping and water resources utilization. It is the main project of the Three Gorges Hydropower Station and the core landscape of the Three Gorges Dam tourist area.
Value meaning
The environmental impact after the completion of the Three Gorges Dam is unpredictable, mainly in the following three aspects: first, geological risks, which lead to erosive geological changes due to the violent fluctuation of the water level in the Three Gorges.
Second, the ecosystem on both sides of the reservoir area has been destroyed. Due to the destruction of animal habitats and the relocation of immigrants, a large number of different fish and freshwater cetaceans have dropped sharply. Third, the Three Gorges Reservoir is cut off and the water flow is reduced, which leads to sediment deposition, drought and salt water erosion in the lower reaches of the Yangtze River.
Since 2003, the three-month fishing ban every spring has ensured the restoration of endangered species and ecosystems, but the biodiversity protection in the whole Yangtze River basin is still very limited, because it mainly focuses on the restoration of commercial species; Although nature reserves have been established, most species are larvae, which makes it difficult to ensure the survival of species and the maintenance of ecosystems.
Baidu Encyclopedia-Three Gorges Dam