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中文摘要：
2012年1月~2013年12月连续24个月在长江靖江段沿岸收集似鳊标本2 334尾,采用基于体长频率数据的ELEFAN I技术估算长江近口段沿岸似鳊的生长参数与种群参数。结果表明：似鳊体长（L,cm）与体质量（W,g）幂函数关系为：W=0.0182×L^2.948（r=0.9823,n=2334）。Von Bertalanffy生长方程描述的似鳊生长参数为：极限体长（L∞）=19.25 cm,生长系数（K）=0.2/a,理论生长起点年龄（t0）为-1.59 a,体质量的生长拐点年龄为3.55 a。采用Pauly的经验公式估算似鳊自然死亡系数（M）为0.556/a。由长度变换渔获曲线法估算出的似鳊总死亡系数（Z）为1.638/a,捕捞死亡系数（F）和开发率（E）分别为1.082/a和0.66/a。2012~2013年长江靖江段沿岸似鳊年均资源重量和资源数量分别为120.59 t和947.4万尾。经相关估算参数和相对单位补充渔获量分析得出,当前长江靖江段沿岸似鳊已处于过度捕捞状态。建议将沿岸水域禁渔期延长至9月（即4~9月）,以实现似鳊资源的恢复和可持续发展。
英文摘要：
A total of 2 334 samples of Pseudobrama simoni（ Bleeker） were collected at the Jingjiang section of the Yangtze River between January 2012 and December 2013. Those fish samples length data were measured,and the ELEFAN I technique was used to estimate growth and population dynamics parameters. The relationship between the fish body length（ cm） and body weight（ g） can well fit by the power function,W = 0. 0182 ×L^2. 984.Growth of this species could be described through a von Bertalanffy mode,and the estimated parameters were：asymptotic length（ L∞= 19. 25cm）,growth constant（ K = 0. 2 year） and age at length 0（ t0=-1. 59 year）.Fish growth turning point for body mass growth curve of the stock was calculated as ti= 3. 55 year^-1. Natural mortality coefficient（ M） was estimated by Pauly ＇s empirical equation and could account for 0. 556 year^-1.Length-converted catch curves were applied to estimate the total mortality coefficient（ Z）,which was found as1. 638 year^-1. Consequently,the fishing mortality coefficient（ F） was calculated as 1. 082 year^-1,and the current exploitation rate（ E） was 0. 66 year^-1. Between 2012 and 2013,the average stock of Pseudobrama simoni at the Jingjiang section of the Yangtze River was estimated 120. 59 tons,with a number of 9 474 000 individuals. The results in this study showed that Pseudobrama simoni in the Jingjiang section has been overexploited. In order to effectively protect P. simoni population along the coastal water,properly longer fishing ban period（ from April to September） might be required in those coastal sections.
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