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当前位置: 首页 > 文章 > 厚颌鲂的年龄结构及生长特性 中国水产科学 2007,14 (2) 215-222
Position: Home > Articles > Age structure and growth characteristics of Megalobrama pellegrini-an endemic fish living only in upper reaches of Yangtze River Journal of Fishery Sciences of China 2007,14 (2) 215-222

厚颌鲂的年龄结构及生长特性

作  者：
李文静;王剑伟;谢从新;谭德清
单  位：
华中农业大学水产学院;中国科学院水生生物研究所
关键词：
厚颌鲂;特有鱼类;年龄;生长
摘  要：
以鳞片作为鉴定年龄的材料,对龙溪河厚颌鲂(Megalobrama pellegrini)种群开展年龄结构与生长特性的研究。结果表明,厚颌鲂鳞片年轮结构呈疏密切割型,年轮特征显著,可用于年龄鉴定,3~4月是年轮形成高峰时间。种群由0~7龄共8个龄组组成,以低龄个体为主,1~3龄个体占83.14%,体长分布主要集中在130~250 mm间(77.71%)。体质量分布主要集中在50~250 g(64.33%)。群体总性比为♀∶♂=1∶1.03,符合1∶1理论比值。体长和鳞径呈直线关系,体长和体质量呈幂函数关系且幂指数接近3,属于匀速生长类型,因此用Von Bertalanffy方程描述其生长特性,相关生长参数分别为:渐近体长L∞=488.89 mm,渐近体质量W∞=2486.96 g,k=0.1648,t0=-0.5453龄。体质量生长拐点Ti=6.40龄,对应体长、体质量分别为Lt=333.14 mm,Wt=746.06 g。厚颌鲂的总体生长性能逊于同属其他鱼类。
译  名：
Age structure and growth characteristics of Megalobrama pellegrini-an endemic fish living only in upper reaches of Yangtze River
作  者：
LI Wen-jing1,2,WANG Jan-wei2,XIE Cong-xin1,TAN Deqing2(1.Fishery College,Huazhong Agricultural University,Wuhan 430070,China;2.Institute of Hydrobiology,the Chinese Academy of Sciences,Wuhan 430072,China)
关键词：
Megalobrama pellegrini;endemic fish;age;growth
摘  要：
Megalobrama pellegrini,a cyprinid fish belonging to Cltrinae,lives only in upper reaches of Yangtze River,mainly in Sichuan Province.Due to the loss of its natural habitat after the completion of the Three Gorges Project and overfishing,it was forecasted that the population sizes of M.pellegrini might decrease sharply in the future.In this study,all specimens were collected from Longxi River,a first step branch of Yangtze River.The results show that the fish scale is a kind of appropriate material for age determination;new annual rings on scales form mainly in March and April;all new annual rings are formed before June.The radii of scale(from focus to the flank) takes on linear relationship with body length,which can be used for body length back calculation.The population of M.pellegrini has a relatively complex age structure which contains 8 age classes ranging from 0 to 7.The preponderant age classes are 1-3 years old,making up 83.14% of the total.Body-length range of the population is 70.0-365.0 mm,mainly between 130.0 mm and 250.0 mm(77.71%).There are three peaks in the body length distribution,which correspond to the average body length of 0,1 and 2-3 age groups.The body weight ranges from 5.3 g to 1 106.2 g,mainly between 50 g and 250 g(64.33%).The total sex ratio(♀∶ ♂) of population is 1∶1.03.Males are more than females in the 1-3 age groups in number,while females are more than males in above 4 age class,and almost all the individuals in 5 and upper age classes are females.Growth of M.pellegrini takes on a constant speed style,which can be described with Von Bertalanffy equation.The growth parameters of L∞,W∞,k and t0 have been estimated to be 488.89 mm,2 486.96 g,0.164 8 and-0.545 3.The body weight growth inflexion point is 6.40,with the corresponding body length of 333.14 mm and body weight of 746.06 g.

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