Effects of nitrogen and phosphorus from fish cage-culture on the communities of a shallow lake in middle Yangtze River basin of China

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	Effects of nitrogen and phosphorus from fish cage-culture on the communities of a shallow lake in middle Yangtze River basin of China
	Guo, LG ; Li, ZJ
	2003
会议名称	Workshop on Management of Aquaculture Effluents
会议日期	MAY 06-09, 2002
会议地点	HONOLULU, HAWAII
关键词	fish-cage culture nitrogen phosphorus shallow lake communities
页码	201-212
通讯作者	Li, ZJ, Chinese Acad Sci, Inst Hydrobiol, Dept Freshwater Ecol, Wuhan 430072, Peoples R China
中文摘要	In recent decades, net-cage aquaculture has become one of the main patterns of the intensive fish-culture in the lakes, reservoirs and even rivers in China. This aquaculture pattern results in enriching exogenous nutrients in water and, consequently, accelerates the process of lake eutrophication. To ensure that normal environmental conditions and fisheries in a lake remain sustainable, qualitative estimations of nutrients in relation to ecosystem changes are essential. A study, mainly on nitrogen (N) and phosphorus (P) influences due to cage fish-culture was carried out in a shallow 35.5 ha bay in Niushanhu Lake, a shallow lake located in middle Yangtze Basin, during the period from March to December 2000. Net-cages in total covered an area of 1000 m(2) and the annual fish yield was 16.0 metric tons (MT). Fish feeding residue entering the water during the period was equivalent to 1532.9 kg of total N and 339.2 kg of total P. Sampling and analyses of the total N and total P concentrations, diversity and biomass of plankton and Chi a were made monthly, while data on zoobenthos were collected twice, respectively, at the beginning and the end of the study. Results showed that the Chi a content in water was correlated negatively to distance from the cage. The Chi a content that is converted into wet biomass of phytoplankton may be expressed by the regression: B = 2.673 - 0.0016D (B, biomass in mg/l; D, distance in km, r=0.9362; n=7). The biomass of rotifers inside or near the cages was higher than that in areas more distant, while that of the cladocerans was the opposite. No significant difference of copepod density or biomass was detected between cages and open water. Changes of zoobenthic community were remarkable. At the beginning of fish farming, there were nine zoobenthic taxa inside and 13 outside the cages. Only two saprophilous taxa, chiefly oligochaetes, were present in the cages at the end of the culture. Density and biomass of benthic animals decreased as well. Several bioindices, such as Shannon-Wiener index, Simpson index, and Margelef index, also exhibited a declining tendency. Through this study, the authors are of the opinion that mass-input of exogenous nutrients may cause negative effects on water quality in areas from the cage to a distance of 50 m outwards. (C) 2003 Elsevier B.V. All rights reserved.
收录类别	SCI
会议录	AQUACULTURE
语种	英语
WOS记录号	WOS:000185998700016
内容类型	会议论文
源URL	[http://ir.ihb.ac.cn/handle/342005/11813]
专题	水生生物研究所_中科院水生所知识产出（2009年前）_会议论文
推荐引用方式 GB/T 7714	Guo, LG,Li, ZJ. Effects of nitrogen and phosphorus from fish cage-culture on the communities of a shallow lake in middle Yangtze River basin of China[C]. 见:Workshop on Management of Aquaculture Effluents. HONOLULU, HAWAII. MAY 06-09, 2002.