230,000 Chinese sturgeons were released into the Yangtze River. What is the positive impact on the environment?

230,000 Chinese sturgeons were released into the Yangtze River. What is the positive impact on the environment? Although the Yangtze River is also cut off, Gezhouba has no reservoir with a storage capacity of nearly 40 billion and the resulting changes in water temperature and runoff, and there is no gas saturation problem caused by the dam with a height of 1 13 meters and flood discharge. So Gezhouba just blocked the migration route, so the Chinese sturgeon set up another spawning ground under Gezhouba, although there was only one, and the Jinsha River basin had 16. After the completion of the Three Gorges Project, the daily water temperature in spring and autumn is smaller than the natural change and lags behind the natural change (stagnant temperature and cold). The natural flood process disappears in spring, and the high water temperature in autumn affects the spawning and hatching of Chinese sturgeon. During the impoundment of cofferdam, the spawning period of Chinese sturgeon was delayed by one month. In recent years, after normal water storage, the spawning ground under Gezhouba dam disappeared. The weakening of the natural flood process in spring also affected the spawning of the four big fish, and then ecological regulation was carried out in spring to simulate the flood process. The number of Chinese sturgeon has decreased significantly, and there are also factors such as water pollution and destruction of offshore fishery resources, but they are not the main reasons.

The survival crisis of Chinese sturgeon really began in Gezhouba. Gezhouba 198 1 disconnected. Our generation may not have been born at that time. In addition, the spread of public opinion at that time mainly relied on radio, television and newspapers. When you grow up, it is almost impossible to know the degree of controversy at that time unless you inquire about the discussion records of the media or academic circles at that time. Admittedly, the controversy over the Gezhouba project is certainly not as good as that of the Three Gorges Project in the 1990s. First, the scale of the Three Gorges Project is many times larger than that of Gezhouba, and the difficulty of the project, the number of immigrants and the impact on the environment in the reservoir area are unprecedented; Second, influenced by the liberal trend of thought in the 1980s, people are keen to discuss large-scale events, which is unmatched by the political atmosphere in the late 1970s. Thirdly, the wildlife protection law was promulgated in 1988, so the discussion on the ecological impact of the Three Gorges Project also has laws as weapons. Perhaps now, the Chinese sturgeon, like the giant panda, has become a precious pet that depends on human feeding.