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西藏雅鲁藏布江双须叶须鱼的年龄结构与生长特征
引用本文:杨鑫,霍斌,段友健,马宝珊,谢从新.西藏雅鲁藏布江双须叶须鱼的年龄结构与生长特征[J].中国水产科学,2015,22(6):1085-1094.
作者姓名:杨鑫  霍斌  段友健  马宝珊  谢从新
作者单位:1. 华中农业大学 水产学院, 湖北 武汉 430070;2. 中国水产科学研究院 长江水产研究所, 湖北 武汉 430223
基金项目:农业部行业专项(201203086).
摘    要:根据2008–2009年、2012年以及2013年采自雅鲁藏布江水系的956尾样本对双须叶须鱼(Ptychobarbus dipogon)的年龄结构和生长特征进行研究。雌性渔获物体长范围为146~569 mm,雄性渔获物体长范围为167~506 mm,性别未辨渔获物体长范围为78~297 mm;耳石上的年轮形成于每年的3–6月份;估算的雌性群体年龄范围为3~24龄,雄性群体年龄范围为3~13龄,性别未辨群体年龄范围为2~6龄。体长(Ls)–体重(W)方程分别为:W=2.494×10–5Ls2.877(雌性),W=2.790×10–5Ls2.856(雄性);拟合出来的von Bertalanffy生长方程为:Lt=606.91–e–0.114(t+0.163)],Wt=2538.41–e–0.114(t+0.163)]2.88(雌鱼);Lt=496.31–e–0.162(t–0.018)],Wt=1391.11–e–0.162(t–0.018)]2.86(雄鱼)。估算的雌鱼和雄鱼的拐点年龄分别为9.1龄和6.5龄,对应的体长和体重分别为396.0 mm、743.6 g和322.5 mm、406.3 g。研究表明,双须叶须鱼种群结构趋向低龄化,可能受全球气候变化、生物入侵和过度捕捞等因素的影响。针对这些影响因素,本研究提出了相应的渔业管理措施。

关 键 词:雅鲁藏布江  双须叶须鱼  年龄结构  生长
修稿时间:2015/11/20 0:00:00

Age structure and growth characteristics of Ptychobarbus dipogon in the Yarlung Tsangpo River, Tibet
YANG Xin,HUO Bin,DUAN Youjian,MA Baoshan,XIE Congxin.Age structure and growth characteristics of Ptychobarbus dipogon in the Yarlung Tsangpo River, Tibet[J].Journal of Fishery Sciences of China,2015,22(6):1085-1094.
Authors:YANG Xin  HUO Bin  DUAN Youjian  MA Baoshan  XIE Congxin
Institution:1. College of Fisheries, Huazhong Agricultural University, Wuhan 430070, China;2. Yangtze River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Wuhan 430223, China
Abstract:

<i>P</i><i>tychobarbus dipogon </i>is one of the most important endemic fish species in the upper and middle reaches of the Yarlung Tsangpo River. However, <i>P. dipogon </i>populations have declined sharply in recent years and their biology is poorly understood. To better understand the biology of <i>P. dipogon </i>and their relationship with management, we describe the relationships between standard length and body weight and age, verify annual growth of lapilli otolith annuli, and estimate <i>P. dipogon</i> growth. The age structure and growth characteristics of <i>P. dipogon</i> were investigated by examining 956 specimens collected in the Yarlung Tsangpo River during 2008-2009 and 2012-2013. Standard lengths were 146-569 mm in females, 167-506 mm in males, and 78-297 mm in some undetermined specimens. Otolith annuli formed from March-June each year. Estimated ages were 3-24 years in females, 3-13 years in males, and 2-6 years in undetermined specimens, respectively. The standard length-body weight relationships were described by <i>W</i>= 2.494 &#215; 10<sup>-5</sup><i>L</i><sub>s</sub><sup>2.877 </sup>for females and <i>W</i>= 2.790&#215;10<sup>-5</sup><i>L</i><sub>s</sub><sup>2.856</sup> for males. The von Bertalanffy growth equations were: <i>L<sub>t</sub></i>= 606.91-e<sup>-</sup><sup>0.114(<i>t</i>+0.163)</sup>] and <i>W<sub>t</sub></i>=2538.41-e<sup>-</sup><sup>0.114(<i>t</i>+0.163)</sup>]<sup>2.88</sup> for females and <i>L<sub>t</sub></i>=496.31-e<sup>-</sup><sup>0.162(<i>t</i></sup><sup>-</sup><sup>0.018)</sup>] and <i>W<sub>t</sub></i>=1391.11-e<sup>-</sup><sup>0.162(<i>t</i></sup><sup>-</sup><sup>0.018)</sup>]<sup>2</sup><sup>.86</sup> for males. The growth inflexion points were 9.1 years for females and 6.5 years for males, and the corresponding standard lengths and body weights were 396.0 mm and 743.6 g for females and 322.5 mm and 406.3 g for males, respectively. Our results show that the <i>P. dipogon</i> population tended to be younger. Climate changes, biological invasion, and over-exploitation could be the main factors threatening <i>P. dipogon</i> stocks. The sound management policies proposed in this study should be implemented to conserve <i>P. dipogon</i> populations.

Keywords:Yarlung Tsangpo River  Ptychobarbus dipogon  age structure  growth
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