【摘要】 研究子二代大鲵年龄和全长、体重关系,为大规模开展大鲵人工养殖和亲本的筛选提供依据。测量了Ⅰ～Ⅺ龄11个年龄组、122尾子二代大鲵的全长、体重,利用matlab分析软件,采用Gompertz、Logistic、Von Bertalanffy、指数函数和幂函数对数据进行回归建模分析。Ⅺ龄子二代大鲵可达到11 kg,Ⅳ～Ⅸ龄的体重增长绝对值较大,Ⅰ～Ⅳ龄体重年增长倍数较大,其中Ⅰ～Ⅲ龄养殖大鲵体重年增长倍数达到170%以上;Ⅺ龄子二代大鲵全长可达到111 cm,Ⅰ～Ⅳ龄全长增长绝对值和全长年增长倍数都较大,其中Ⅰ～Ⅱ龄全长年增长倍数达到60%以上,Ⅰ～Ⅲ龄全长年增长绝对值超过16 cm;全长与体重之间具有极强的正相关性。5种生长方程对子二代大鲵的年龄和体重、全长关系拟合度均较高(R~2>0.97);年龄和体重关系以Logistic函数生长曲线拟合度最好;年龄和全长关系以Von Bertalanffy函数生长曲线和指数方程拟合最好。大鲵的体重和全长关系符合幂函数曲线;体重和全长生长方程研究结果均表明子二代大鲵在Ⅺ龄接近其生长极限。本文建立的生长模型更能反映子二代大鲵固有的生长特性,而幂函数等揭示的是某一年龄段内的生长特性。更多还原

【Abstract】 In the previous studies, giant salamanders at the age of Ⅶ-Ⅷ were the primary research subjects, and the constructed growth model was just suitable for giant salamanders in a short age range. To describe the growth characteristics of the giant salamanders more accurately and provide basic data to support the selection of parents for large scale artificial breeding, in this research, we analyzed the relationship between age and total length, body weight of the giant salamanders in a large age scale（Ⅰ-Ⅺ）. This study was based on the investigation data of 122 second filial giant salamander individuals during 2012-2016, including age, total length and body weight. Von Bertalanffy, Logistic, Gompertz, exponentials and power functions were adopted to simulate the relationship between age and total length, body weight. Results show that F2 giant salamanders reached 11 kg and 111 cm at the age of Ⅺ, and the absolute weigh gain of Ⅳ-Ⅸ giant salamanders was the largest, while increase percentage of Ⅰ-Ⅳ giant salamanders was the highest, especially for Ⅰ-Ⅲ giant salamanders, with the increase percentage of 170%. The largest absolute length growth and increase percentage occurred in group of Ⅰ-Ⅳ giant salamanders, and the total length of Ⅰ-Ⅲ giant salamanders increased 16 cm yearly. The Von Bertalanffy,Gompertz, Logistic, exponentials and power functions all described the growth of F2 giant salamanders very well（R²>0.97）. The relationship between age and body weight of artificial breeding F2 giant salamanders was explained as ■ by Logistic function, and the relationship of age and total length was described as y=1396.2×(1-e^{-0.142x-0.083}) by the Von Bertalanffy function and y=-1285.32 e^-0.14x+1396.2 by exponentials function. The relationship of body weight and total length fitted the power function curve and the equation was y=0.00003x^2.809, and the total length presented significantly positive correlation with the body weight. The growth equations of body weight and total length both show that the growth inflexion point of the F2 giant salamanders occurred at the age of Ⅺ. The relationship between age and total length, body weight of F2 giant salamanders illustrated in this paper was superior to previous results and was more consistent with the biological growth rules of the giant salamanders. The results will provide reference for large-scale aquaculture of Chinese giant salamanders.更多还原