Analysis Of Fish Habitat Environment Impact In Nujiang River Upstream Hydroelectric Power Development And Protection

Hydroelectric power as an environmentally clean, friendly, renewable energy sources, has a very important role on China’s economic development, the development of hydropower make our abundant hydropower resources have been fully utilized. The hydropower cascade development is the most important development mode in our country currently. he hydropower cascade development will undermine the continuity and connectivity of the river, will hinder the exchange of fish and other aquatic organisms. Nu River hydropower cascade development in planning, while promoting social development, will have a negative impact on fish resources and fish habitat of Nujiang River Basin.According to the aquatic ecological status quo investigation of hydropower development, aquatic ecology, fish and other aquatic organisms species composition, population size and structure, ecological habit, species diversity of Nujiang River upstream basin in July 2014 to August. And a preliminary understanding of the fishery resources, aquatic habitats and hydropower development status of the Nujiang River basin upstream. The survey found that Naqu River has been built three hydropower stations of Biru, Chalong and Jiqian in Nujiang River upstream. There are twelve kinds of fish in Nujiang River upstream, which belong to two orders, three families. They can adapt to cold weather, and they are all cold water fish. Where Schizothrax nuhiangensis and Parenchiloglanis gongshanensis are endemic species in Nujiang River, Ptychobarbus kaznakovi is a “vulnerable” species in Redbook.Fish of Nujiang River upstream are made up of Central Mountains composite body and South Mountain area composite body, including four ecological groups. Diets are widely, including phytoplankton, zooplankton, benthic invertebrates so on; breeding time from melting ice until October every year. By the survey analysis of catches, Schizothrax nuhiangensis have the largest mass ratio, and Schzopygopsis thermalis have the maximum number. Schizothrax nuhiangensis are mainly distributed in Nujiang River and other large tributaries such as Yuqu River. Schzopygopsis thermalis, Ptychobarbus kaznakovi and Triplophysa are widely in Nujiang River Basin. Parenchiloglanis gongshanensis distributed in Zuogong of Nujiang River Basin, and Glyptotharax zamaensis istributed in Zana of Nujiang River Basin. Fish of Nujiang River upstream are not strict with spawning ground environment, widespread and scattered in an eligible river. Feeding sites mainly in shallow waters near the shore. Wintering grounds are mainly distributed in the deep water area, in Nujiang River and larger tributaries.Hydropower development will have some impact on fish habitat connectivity, hydrologic regime, water temperature, water quality, sediment, topography and landforms in Nujiang River upstream. Through the analysis of the impact of hydropower project on fish habitat, initially put forward the protection area of fish habitat in Nujiang River upstream. Firstly, analyzes the river function of fish habitat protection, determine Schizothrax nuhiangensis, Ptychobarbus kaznakovi, Parenchiloglanis gongshanensis and Glyptotharax zamaensis for the protection objects. And to assess and plan the planning slective fish habitat. Ultimately determine the Cuona Lake, one hundred and eight km natural river between Reyu and Tongka, thirty-one km natural river between Yeba and Lalong in Nujiang River; and Yuqu River, Suoqu River, Jiequ River, Zhuo MLC River and Lengqu River(between Bokeyu and Erao) as fish habitat protection. Finally, put forward the measures and countermeasures about fish habitat protection in Nujiang River upstream.