The loss of water pollution in China is much higher than that of fish farming

Introduction: Liu Jiashou, Institute of reservoir fisheries, Chinese Academy of Sciences, Ministry of water resources, recently told reporters in an exclusive interview that at present, the income of freshwater fishery in China is only over 8 billion yuan per year, while the loss caused by water pollution of lakes and reservoirs is far higher than that He stressed that these polluted water bodies, in addition to urban industrial wastewater and domestic sewage pollution, fishery's excessive use of water surface is also one of the important pollution sources Taking Wuhan East Lake as an example, the development of Fisheries was once advocated, and a large number of herbivorous fish were released, which led to the imbalance of the whole water ecosystem The fishery output value is only about 10 million per year, but now the water pollution control costs more than 2 billion yuan According to the latest national fresh water resources quality assessment of the Ministry of water resources, 67 of 131 large lakes in China are eutrophic The eutrophication degree of water bodies in the suburbs of cities is generally on the high side, such as Hangzhou West Lake, Nanjing Xuanwu Lake, Yunnan Dianchi Lake, Hefei Chaohu Lake and Wuhan East Lake In recent years, the water quality evaluation of more than 100 reservoirs by relevant departments shows that 13 reservoirs are eutrophic and 22 reservoirs are polluted to varying degrees These polluted reservoirs are often important water sources for urban water supply Liu Jiashou said that the "cost" of harnessing these lakes and reservoirs is obviously much greater than their fishery output value He also pointed out that at present, most lakes and reservoirs in developed countries do not need to be used for commercial fish farming More and more people realize that compared with the ecological environment value, tourism landscape value and water supply function provided by water, the value of fish only accounts for a small part.