中文摘要：

2010年9月～2012年8月在长江上游攀枝花等9个采样点收集到长薄鳅（LeptobotiaelongataBleeker）样本1528尾，基于体长频率数据采用世界粮农组织（FAO）开发的FiSATII软件研究了长江上游长薄鳅的生长与种群参数。估算结果显示长薄鳅的极限体长（L∞）为656．1mm，生长系数（k）为0．15／a，理论生长起点年龄（t。）为-0．0483。采用Pauly的经验公式估算长薄鳅的自然死亡系数（M）为0．33（其中长江上游年平均水温为18．4℃），总死亡系数（z）、捕捞死亡系数（F）和开发率（E）分别为0．85、0．53和0．62。2010~2011年长江上游长薄鳅年均资源重量和资源数量分别为13．21t和162862尾，最大可持续产量（MSD为5．17t。经相关估算参数和相对单位补充渔获量分析得出，当前长江上游长薄鳅已处于过度捕捞状态，有必要采取有效保护措施。

英文摘要：

Growth and population dynamics of elongate loach （Leptobotia elongata Bleeker） were investigated by using FiSAT II software of FAO on length based data, 1528 specimens of elongate loach were collected from Panzhihua, Yongshan, Shuifu, Juexi, Nanxi, Neijiang, Chishui, Jiangjin, Chengjiang and Wanzhou in the upper reaches of the Yangtze River between September 2010 and August 2012. The relationship between the body length（mm） and body weight（g） was expressed as W= 1 X 10-~ L3 024. The growth parameters estimated by length frequency analysis were： asymptotic length （L = 656.10 mm）, growth constant （k = 0.15 year-1） and age at length 0 （to =--0. 048 year-l）. The natural mortality （M） of elongate loach was 0.33 year 1 by using Pauly＇s M empirical equation, where the mean habitat temperature was 18.4 ~C. The total mortality （Z） was 0.85 year 1 and the fishing mortality （F） was 0.53 year-1. The exploitation rate （E） was found to be 0.62. During 2010--2011, the average stock of elongate loach from the upper reaches of the Yangtze River was 13.21 tonnes, with a number of 162 862 individuals. The MSY was estimated to be 5.17 t for elongate loach. The analysis of related parameters and relative yield-per-recruit suggest that elongate loach in the upper reaches of the Yangtze River is over-exploited. Corresponding conservative fishery strategies should be carried out to protect the elongate loach in the upper reaches of the Yangtze River.