长荡湖翘嘴鲌年龄结构和生长特征研究

Preliminary Study on the Age Structure and Growth Characteristics of Culter Alburnus from Changdang Lake

为了解长荡湖翘嘴鲌种群的年龄结构及生长特征,采集长荡湖翘嘴鲌样本113尾,通过鳞片鉴定其年龄,并建立体长、体质量的生长方程。结果显示,翘嘴鲌体长为18.15~74.63 cm,体质量为58.5~4524.6 g。翘嘴鲌由1~6龄个体构成,其中1~3龄个体占比为72.6%,种群组成呈现出低龄化。体长和体质量方程式为W=0.0103L^(2.9928)(n=113,R^(2)=0.9931),表明翘嘴鲌为匀速生长类型。体长生长方程为L_(t)=109.28[1-e^(-0.1232(t+0.6468))],体质量生长方程为W_(t)=12993.47[1-e—(-0.1232(t+0.6468))]^(2.9928)。生长拐点年龄t_(i)=8.25龄,对应的体长和体质量分别为72.76 cm和3656.34 g。

In this study,in order to investigate the relationship between age structure and growth characteristics,a total of 113 Culter alburnus samples from Changdang Lake were collected and analyzed for their age structure and growth characteristics.The results showed that the body length of C.alburnus ranged from 18.15 to 74.63 cm,and that body weight ranged from 58.5 to 4524.6 g.The age of C.alburnus ranged from 1 to 6 years with dominant populations with 1-3 years(72.6%),which demostrated a youth trend of C.alburnus.The relationship between body weight and body length was described by significant power function:W=0.0103 L^(2.9928)(n=113,R^(2)=0.9931),which exhibited uniform growth pattern.The growth equations of body length was L_(t)=109.28[1-e^(-0.1232(t+0.6468))],and that of body weight was W_(t)=12993.47[1-e^(-0.1232(t+0.6468))]^(2.9928).The growth inflection age was 8.25,and the body length and body weight corresponding to inflection age were 72.76 cm and 3656.34 g,respectively.