"Green fish" could return to the Xuanwu Lake

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10 during the operation, Xuanwu Lake rippling blue waves, the past seems to renewed vitality, but quoted experts in the Yangtze River water erosion in the eyes of Xuanwu Lake is still a temporary solution. People worry in this occasion, a once in Xuanwu Lake, "living" off microlepis fish jumped into the expert's view. Because the fish can reduce the eutrophication status of Xuanwu Lake, it was suggested that it should "go home" the.


    


    Water pollution led to extinction
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    Chen Chu-sing is a researcher at the Nanjing Institute of Fisheries Sciences, had what he had to be painstakingly drew microlepis fish from the field. He told reporters that the early 80s of last century, when the fish do not present such a rich country in the promotion of three fish, respectively Wuchang fish, Hybrid fish carp and microlepis. Xuanwu Lake's water quality was very good, very suitable for fish raising a microlepis. Microlepis fish moved into the Xuanwu Lake, after what they want, very harmonious.
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    "In 1988, due to a sudden deterioration of water quality of Xuanwu Lake, microlepis fish die off and eventually disappeared," Chen said researchers here and sigh, "As the fish market has been saturated, can not continue to engage in the Xuanwu Lake in artificial breeding, so microlepis fish have no chance in the Xuanwu Lake emerged. "


The so microlepis fish "home" of the


    Microlepis fish, also known as sweetlips oblique jaw microlepis, also called sand Guzi, pornographic films, Huang Mei Diao child, is carp, the Yangtze River region common fish. Meat tasty, the fish mainly debris, mud and rot with algae for food, the culture water has a positive effect of water quality improvement. Chen Chu-sing said that now revisit microlepis fish because the fish are in the middle and lower classes of fish, usually more acute in the water habitat, the scraping algae lake water, which water purification has a positive effect, often called "green fish" .


    Currently, the Nanjing Research Institute of Fisheries Sciences has a project to promote microlepis fish reported to the relevant part of Jiangsu Province, hoping to re-make microlepis fish in some lakes, such as the Nanjing Xuanwu Lake and so on. Chen Chu-sing said, this time to promote the fish, increasing fish production, increase the economic benefits have been retired as a secondary address eutrophication is microlepis heavy fish.


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    Lake fish are now being the chief culprit for the pollution of many lakes, lakes in the end can not fish? Chen Chu-sing said that in fact this argument has been misunderstood, and fish the lake ecosystem is an important part of its feeding to alleviate pollution an important role, is not no fish, but to breed fish, the number of fish raised the issue, This requires scientific design. Grass carp can not be raised as the Xuanwu Lake, because the surrounding Xuanwu Lake is a small wetland, planted with lotus and other aquatic plants, once the support of the grass carp, they may bite the roots of water plants, destroy the environment. Can not support more fish, the water is only so much oxygen, raise more fish, destruction of ecological balance, but also must not. To test microlepis fish in the end how much effect on the water, Chen Chu-sing at the Presidential Palace Hee Park, the water inside the interview to support the fish, the current initial success.


    


    


Now the introduction of possible ecological damage


    


    Not all experts are optimistic about this practice, Chinese Academy of Sciences Institute of Geography lakes researcher Xiao-Hong Gu told reporters in a lake in the introduction of a new species, research and the difficulties faced by very much. In layman's terms, so much water, ecosystems and food chains are complex, you have to find a suitable fish for the microlepis accurate ecological position, it is more difficult. Nongbu Hao, to destroy the entire ecosystem, affecting even the original species and other organisms. Currently, many regions of the lead fish, expressed caution, such as Taihu Lake had legislation against foreign species enter.


    


It alone can not solve all the problems


    


    Xiao-Hong Gu said, Xuanwu Lake's eutrophication problem is rather complicated, even if the introduction of successful fish microlepis alone can not solve all the problems far. Moreover, everything has pros and cons of both, microlepis fish is no exception. Microlepis rather special form of fish, it is often "blow up" lake biology, which of course can solve some of eutrophication in Lake, but also leave a "hangover", that is the fish itself stirred the water that acts to speed up the bottom of recycling nutrients, and also part of the fish waste out of their own, which also will accelerate the cycle of the entire ecosystem. So, objectively, microlepis fish is really a means to solve the Xuanwu Lake, but there it is not enough.


    


Governance must be multi-pronged Xuanwu Lake


    


Governance for the Xuanwu Lake, Xiao-Hong Gu and Chen Chu-sing Fellow researchers are of the view that a fundamental control Xuanwu Lake, must not proceed from the control of pollutants, is not an overnight success can be immediate. Interview some other pollution control experts in Nanjing, they have made some suggestions, such as construction of wetlands, with yellow clay treatment, etc., but they think that we must first cut off the sources of pollution Xuanwu Lake, it is most important.