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中文摘要：
刀鲚（Coilia nasus）是长江中下游最重要的经济鱼类之一。根据2003年1月—2004年12月、2008年1月—2009年12月、2012年1月—2013年12月3个调查期长江靖江段沿岸定置张网捕捞数据,运用Fi SAT II软件对刀鲚种群参数进行估算。结果表明：3个研究期靖江沿岸带刀鲚体长（L,mm）与体质量（W,g）幂函数关系分别为：W（2003-2004）=2.72×10^-6L^3.030（r=0.974,n=218）,W（2008-2009）=3.75×10^-6）L^2.961（r=0.925,n=823）,W（2012-2013）=2.27×10^-6L^3.061W（2012-2013）=2.27×10^-6L^3.061（r=0.936,n=837）。本研究3个研究期中von Bertalanffy生长方程描述的刀鲚群体的生长参数K、t0和ti均较为接近,沿岸带刀鲚群体以当年孵化的幼体为主要组成成分,表现为生长速度较快（K=0.54-0.56 a^-1）、拐点年龄较小（ti=1.49-1.54 a）的生长特征。年际比较显示,近年来靖江沿岸带刀鲚的捕捞死亡系数和开发率较早年均有所下降。但根据Beverton-Holt动态综合模型显示,靖江段沿岸刀鲚仍处于过度开发状态。种群补充模式表明,每年4—9月为沿岸带刀鲚的主要补充期。为了有效保护珍贵的刀鲚幼鱼资源,建议将沿岸水域禁渔期延长至9月（即4—9月）,以实现刀鲚资源的恢复和可持续发展。
英文摘要：
Coilia nasus（Japanese grenadier anchovy） is a commercially important fishery resource in the middle and lower reaches of the Yangtze River.A total of 1878 C.nasus were caught by a stow net from coastal waters at Jingjiang section of the Yangtze River during three periods of January 2003 to December 2004,January 2008 to December 2009,and January 2012 to December 2013.The present study aimed to determine the growth and population parameters of C.nasus at Jingjiang section of the Yangtze River.Based on length frequency data collected from the surveys,growth,mortality and recruitment pattern of C.nasus were estimated by utilizing Fi SAT II software developed by the Food and Agriculture Organization of the United Nations（FAO）.The body length（L） distribution of C.nasus ranged from 34.7-258.0 mm,and the weight（W）distribution from 0.11-71.50 g.Growth equations were calculated as W=2.72×10^-6L^3.030（r=0.974,n=218） for 2003-2004,W=3.75×10^-6L^2.961（r=0.925,n=823） for 2008-2009 and W=2.27×10^-6L^3.061（r=0.936,n=837） for 2012-2013.The von Bertalanffy growth parameters were L∞=282.5 mm,K=0.56 year-1,t0=-0.49 years,ti=1.49 years for 2003-2004,L∞=295.0 mm,K=0.54 year-1,t0=-0.50 years,ti=1.51 years for 2008-2009,and L∞=296.0mm,K=0.55 year-1,t0=-0.49 years,ti=1.54 years for 2012-2013.These results indicated that growth parameters were quite close among three survey periods,and C.nasus population along the coast water collected at the Jingjiang section of the Yangtze River was mainly comprised of larvae and juveniles with rapid growth rate and young inflection point age.Our results also showed that the estimated fishing mortality（F） and exploitation rate（E） were lower in 2012-2013 than in 2003-2004.However,the analysis of the Beverton-Holt dynamic model suggested that C.nasus at the Jingjiang section of the Yangtze River was still over-exploited.The recruitment pattern was continuous,displaying a major recruitment period from April to September annually.In order to effectively protect C
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