| 长江天鹅洲故道银鮈年龄、生长和死亡率的研究 |
| Age, growth and mortality of silver gudgeon, Squalidus argentatus (Sauvage and Dabry de Thiersant, 1874) in Tian-e-zhou Oxbow of the Yangtze River |
| 投稿时间：2013-03-12 修订日期：2013-04-14 |
| DOI： |
| 中文关键词:银鮈 鳞片 年龄 生长 死亡率 长江天鹅洲故道 |
| 英文关键词:Squalidus argentatus Scale Age Growth Mortality Tian-e-zhou Oxbow of the Yangtze River |
| 基金项目:世界自然基金会项目“长江天鹅洲故道小型鱼类资源评估”(2985)；湖北长江天鹅洲白鱀豚国家级自然保护区管理处委托项目“天鹅洲故道水生生物资源调查”。 |
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| 中文摘要: |
| 根据2011年3月至2012年1月在长江天鹅洲故道采集的银鮈(Squalidus argentatus)样本873尾,用鳞片为年龄鉴定和生长退算材料,研究银鮈的年龄、生长特性及死亡率。结果表明,雌雄群体均由1～6龄组成,雌鱼87.35%为1～3龄,雄鱼87.01%为1～3龄。雌雄鱼体长(L)和体重(W)关系表现为异速生长,雌鱼W=0.009L3.2285,雄鱼W=0.009L3.2254。以退算体长拟合vonBertalanffy方程,得到生长参数为:雌鱼L∞=17.1797cm,k=0.1820,t0=-1.2673和雄鱼L∞=11.5069cm,k=0.4074,t0=-0.5764。雌雄鱼的自然死亡率分别为M=0.6048/a和M=1.1459/a,远高于一般鱼群自然死亡率(M=0.2～0.3/a);开发率分别为E=0.5711和E=0.4183。长江天鹅洲故道银鮈雌鱼处于过度开发的状态,应加强管理。 |
| 英文摘要: |
| According to those 873 specimens of Squalidus argentatus collected from Tian-e-zhou oxbow of YangtzeRiver from March 2011 to January 2012，using their scales as the material of age identification and back一calculation of growth，this paper researches the age，growth characteristics and mortality of S. argentatus. The results shows that the ages for both sexes range from 1 to 6 years old，and most individuals are 1 to 3 years old for males and females accounting for 87. 01% and 87. 35 % of total，respectively. The length-weight relationship between males and females shows an allometric growth. And it can be expressed respectively as W=0. 009L3.2254andW=0.009L3.2285. The von Bertalanffy growth equation is fitted on the back-calculation body length data，resulting in parameter values of L∞=11 .5069 cm , k=0. 4074 , t0= －0. 5764 for male and L∞=17 . 1797 cm , k=0. 1820 ,t0= －1 .2673 for female. For males and females，the natural mortality is M=1 .1459 per year and M=0. 6048 per year. It indicates that the mortality of S. argentatus is much higher than the ordinary ones (M=0. 2一0. 3 per year);and the exploitation rate is E=0.4183 and E=0.5711.In conclusion，the female of S. argentatus in Tian-e-zhou Oxbow of Yangtze River is over exploited，so we should strengthen management on them to protect them better in the future. |
| 王海生,沈建忠,李 霄,胡少迪,龚 成,孙广文,黄 丹.2013.长江天鹅洲故道银鮈年龄、生长和死亡率的研究[J].水生态学杂志,34(2):7-13. |
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