Why does it take ten years to ban fishing at once? Because of long-term overfishing, there are basically no fish to catch in the Yangtze River. Today's Yangtze River? Four big fish? The resources (black carp, grass carp, silver carp and bighead carp) have shrunk sharply, the catch has dropped by more than 90% compared with the 1950s, and the spawning has dropped from the highest of 654.38+02 billion to the lowest of less than 654.38+00 billion. The reproduction and growth of these four kinds of big fish generally take four years, and the fishing ban period is set at ten years, so that they can reproduce for two or three generations and restore their numbers. Moreover, the recovery of aquatic organisms is relatively slow, especially some algae plants, which cannot be recovered overnight. Therefore, in order to solve this problem once and for all, the 10 year fishing ban was directly set.
There are more than 400 species of fish in the Yangtze River, and there are more than 80 species of endemic fish/kloc-0. Is the Yangtze River green, silver carp and bighead carp? Four big fish? Natural germplasm resource bank of important economic fish, etc. It is a refuge for many rare aquatic creatures. There are 16 species of rare and protected wild fish in the list of national key protected wild animals approved by 1988 in the State Council, including the first-class protected animals distributed in the Yangtze River system. Chinese sturgeon, white sturgeon and Yangtze sturgeon, second-class protected animals? Myxocyprinus asiaticus, Japanese eel, Huangshan fish and Songjiang perch, etc. The Yangtze sturgeon, a species endemic to China and a national first-class protected animal, is extinct, and the breeding population of Chinese sturgeon is less than 20. These fish are suffering from habitat destruction caused by human activities, and the population is scarce, which seriously threatens their survival.
Due to the backward fishing methods and small catch in the past, human beings will not have a great impact on nature. However, with the industrialization and mechanization of fishing, the demand for resources has exceeded the growth rate of resources, and now there are basically no fish in the Yangtze River. In this increasingly severe form, more and more people have dried up and started fishing. Electric poisoning? Homeless network? And so on, finally formed? The less resources are fished, the worse the ecology is and the poorer the fishermen are? A vicious circle. Therefore, the main stream and important tributaries of the Yangtze River are temporarily closed to fishing for 10 years, that is, all productive fishing is prohibited.