摘要
长春南湖原有鱼类20种。随着富营养化程度的加重,鱼类种类数减少,一些种类绝迹。1992年实施生态工程治理后,鱼类组成以人工放养种类为主。鱼产量波动幅度较大,自20世纪60年代以来呈下降趋势,80年代末达到最低点,90年代有所回升。目前以养殖鱼类为主体,产量较为稳定。鱼类以II龄和III龄个体所占比例最大,I龄和高龄个体较少。
There were 20 fish species in the Nanhu Lake,Changchun previously.With the increase of eutrophication level,fish species number reduced,some species became extinct.After the ecological engineering in 1992,the fish community was mainly composed of artificially cultured species.There was a big fluctuation in fishery yield.The fishery yield kept decreasing since 1960's,attained the minimum by the end of 1980's,and began to go up from 1990's.At present cultured fish dominates the fish community,the fishery yield keeps relatively stable.In the fish community,the individuals at Ⅱ and Ⅲage classes had the largest percentage,there were less individuals at Iage class and higher age classes.
出处
《中国环境监测》
CAS
CSCD
北大核心
2003年第2期9-12,共4页
Environmental Monitoring in China
基金
国家"973"重点基础研究发展规划项目(G20000018606)
国家"八五"科技攻关项目(85-21-03-04)
关键词
富营养化
鱼类群落
组成
产量
年龄结构
eutrophication
fish community
composition
yield
age class
