"Fish for water" ecological fishery experiment is successful

Introduction: "fish farming with water" is a well-known principle, but the one-year experiment of "fish farming with water" operated by the reservoir fishery research institute of the Ministry of water resources has been successful recently, which means that the breeding mode of conventional freshwater fishery in China will undergo a fundamental change Liu Jiashou, the researcher who presided over the experiment, said that for many years, the cultivation mode of freshwater fishery in China has generally focused on the pursuit of economic benefits, resulting in the over utilization of rivers, lakes and reservoirs, which is very easy to lead to the eutrophication of water bodies and the decline of water environment For example, the application of chemical fertilizer to fish culture in pursuit of high yield directly increases the nitrogen and phosphorus content of water bodies, which is passed in order to improve the survival rate of "domestic fish" The quantity of fish eating fish leads to the imbalance of ecosystem The experiment was started a year ago in the Xikeng reservoir of Shenzhen with an area of 1700 mu This reservoir mainly provides domestic water for some nearby residents In recent years, with the increase of industrial wastewater and domestic sewage and the over cultivation of economic fish, the water quality of the reservoir has become worse Researcher Liu Jiashou has been devoted to the research of controlling eutrophication of water body for a long time He got inspiration from the fact that silver carp, which grasps phytoplankton, can directly control the "bloom" of cyanobacteria Finally, he put forward a new model of "fish for water" of ecological fishery, which is dominated by biological manipulation The first mock exam is to feed a certain number of fish eating fish such as mandarin fish, let them eat wild fish in the reservoir, reduce the number of wild fish, increase animal zooplankton, and eat more phytoplankton in water As a result, the transparency of water will be better, and the nitrogen and phosphorus in the main pollution components will also be reduced At the same time, researchers will also plant floating plants such as "water hyacinth" and water filtering animal mussel, take comprehensive biological means to "care" the water quality, and finally achieve the ecological balance of the water body and purify the water quality In short, the process of "raising water by fish" is: raising mandarin fish, restraining wild fish, increasing zooplankton, reducing phytoplankton, improving water transparency, increasing self purification capacity of reservoir It can be seen from the just concluded test monitoring report that in one year, the nitrogen content of Xikeng reservoir decreased by 20%, the phosphorus content decreased by 15%, the oxygen increased obviously, and the transparency increased in varying degrees, which shows that the water quality has been improved It is understood that after the success of the experiment conducted in Xikeng reservoir, the Ministry of water resources and water bureaus in various parts of China will gradually promote the new mode of ecological fishery of "fish for water" and restrict the cancellation of the conventional fishery mode aimed at increasing production.