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Biological manipulation of eutrophication in West Yangchen Lake

Aquaculture and Fisheries 2019年第5期4卷 190-197页

作者： Chunfang Cai Jie He Wen Chen Junbiao Zhang Qianqian Wang Xuehong Song Yuantu Ye Yongling Wang Ping Wu Xiamin Cao School of Biology and Basic Medical Sciences Soochow UniversitySuzhou215123China

This paper aims to share findings on nonclassical biomanipulation from a field study on eutrophic West Yangcheng(WY)*** the forty years before 2009,cyanobacteria frequently bloomed in WY Lake,an event which has not occurred since *** stocking density of filter-feeding carp was estimated to be more than 50 g/m^(3) in July after 2009,approximately double the amount observed before 2009,and the ratio of silver carp to bighead carp(SBR)increased from 0.8 to more than *** with the water quality between 2004 and 2007,the total nitrogen(TN)and the chlorophyll-a(Chl-a)concentration decreased while total phosphorus(TP)and transparency(SD)increased significantly after 2009(Pration was observed in Jul,Jun,May,Jul,and Mar in 2009,2010,2011,2016,and 2017,*** Chl-a concentration was significantly negatively correlated with TP(P0.05).A significant negative correlation was observed between fish yield and SD(Pcarp more effectively restrained algae growth when SD was *** results indicated that a high density of filter-feeding fish with increased SBR interfered with the driving effects of nutrients and temperature on the growth of algal biomass and then restrained bloom of *** may be necessary to take SD into consideration for determining the appropriate fish stocking density for the biomanipulation of algae.

关键词： Biomanipulation West yangchen Lake Algal bloom Filter-feeding fish Stocking density ratio of silver carp to bighead carp

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