【摘要】 研究长脂拟鲿的年龄和生长特征,为开展其人工养殖、种质鉴定以及资源的利用与保护提供基础资料。样品鱼于2013年2-10月采自贵州境内沅江水系氵舞阳河,共193尾,体长94²09 mm、体重9.7⁵9.2 g。以脊椎骨、匙骨、鳃盖骨、胸鳍棘等为年龄鉴定材料,研究了长脂拟鲿的年龄和生长特性,阐述年轮特征,计算了相对生长率、瞬时生长率、生长常数、生长指标等生长参数。脊椎骨椎体的年轮标志最清晰,其各个生长年带的径向宽度近似相等,为长脂拟鲿年龄鉴定的理想材料;脊椎骨椎体年轮为疏密型年轮,年轮形成的时间为3-7月。氵舞阳河长脂拟鲿渔获物年龄组成为1⁸龄,2⁴龄为优势年龄组,占总样本量的84.97%。长脂拟鲿体长与脊椎骨轮径关系的拟合方程为L=60.91R+65.709,体长与体重关系的拟合方程为W=0.00074 L2.0935。von Bertalanfy、Gompertz和Logistic生长方程对长脂拟鲿体长、体重生长的拟合度均较高（r²>0.98）,以von Bertalanfy生长方程拟合度最高。长脂拟鲿von Bertalanfy生长方程为:L_t=364.32[1-e^{-0.058（t+4.001）}],W_t=170.49[1-e^{-0.058（t+3.994）}]2.0935。生长拐点年龄为8.73龄,拐点年龄时体长、体重分别为190.22 mm、43.74 g。长脂拟鲿生长可以划分为1⁵龄、6⁷龄两个不同的生长阶段。长脂拟鲿属生长缓慢鱼类,其生长为异速生长。更多还原

【Abstract】 Pseudobagrus adiposalis（Pseudobagrus,Bagridae,Siluriformes） is an economic fish of small size and high nutritional value,inhabiting the Yuanjiang River in the Yangtze River basin,the Xijiang River in the Pearl River basin and the Danshui River in Taiwan.In this research,the age structure and growth characteristics of P.adiposalis were studied for the first time to provide basic data to support the artificial culture,germplasm identification,resource utilization and conservation of the species.A total of 193 P.adiposalis specimens,standard length 94-209 mm and body weight 9.7-59.2 g,were collected from the Wuyang River（a tributary of the Yuanjiang River） in Guizhou from February to October,2013.The annuli characteristics of vertebra,cleithrum,opercular and pectoral spine in P.adiposalis were observed under a microscope,and the age of each specimen was determined based on each of the four age validation materials.Growth parameters,including relative growth rate,instantaneous growth rate,growth constant,growth index were calculated.Of the four age validation materials,the vertebra,with the most distinct annuli and consistent annual growth,was the best age identification material for P.adiposalis.The sparse-dense type of vertebra annuli typically form from March to July.The P.adiposalis population in the Wuyang River ranged in age from 1 year to 8 years,dominated by individuals of 2-4 years（84.97%）.The relationship between the standard length（L） and vertebra annuli radius（R） was described as:L=60.91 R+65.709,and relationship between the body weight（W） and standard length（L） was described as:W=0.00074L2.0935.The von Bertalanffy,Gompertz and Logistic growth functions all describe P.adiposalis growth very well（r²>0.98） and the von Bertalanffy equation was,L_t=364.32 [1-e^{-0.058（t +4.001）}],Wt=170.49[1-e^{-0.058（t+3.994）}]2.0935.The growth inflexion point occurred at 8.73 years,with a standard length of 190.22 mm and body weight of 43.74 g.The growth of P.adiposalis is slow and allometric and naturally divides into two phases,1-5 years and 6-7 years.更多还原