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为了解长江下游沿岸似鳊(Pseudobrama simoni)的种群变动及生长状况,研究了2002-2009年间在靖江沿岸用定置张网采集的每月2次或3次共237份渔获物样本。结果表明:237份样本共有鱼类73 960尾、409 256.23 g。其中似鳊4 253尾、39 618.05 g,分别占总渔获量的5.75%和9.68%。平均每样本19尾、180.08 g,最高达145尾、1714.6 g。时间格局分析表明,似鳊月渔获重量呈非平稳的随机过程,对2002-2009年的月渔获重量进行ARIMA建模拟合,建立了方程为(1-0.387B)(1-B12)lnyt=(1-0.555B12)et的ARIMA(1,0,0)(0,1,1)12的预测模型,该模型对2003-2009年的预测精度达83.21%～93.90%。对2005年采集的全部个体作性别、年龄和生长特征分析,显示似鳊的雌雄性比为1∶2.3。雄性有1～3龄3个年龄组,雌性只有1～2龄2个年龄组,年龄结构明显低于姚江和钱塘江种群。雄性的Von bertalanffy生长方程为:体长Lt=147.17×[1-e-0.1648×(t+3.2036)],体重Wt=44.36×[1-e-0.1648×(t+3.2036)]2.785;推算的渐近体长L∞为147.17 mm,渐近体重W∞为44.36 g。研究亮点:似鳊是长江中下游最常见的经济鱼类之一,但目前生物学资料还很少。本文分析了2002-2009年间采自长江靖江段沿岸的237份似鳊渔获物样本,弄清了年、季和月分布规律,建立了ARIMA预测模型。揭示了种群的性比和年龄结构,获得了主要的生长参数。
In order to understand the population dynamics and growth of Pseudobrama simoni along the lower reaches of the Yangtze River, a total of 237 fish samples collected twice or three times a month on the Jingjiang River from 2002 to 2009 were collected. The results showed that there were 73 960 fish and 409 256.23 g fish in 237 samples. Among them, 4 253 were found, 39 618.05 g, accounting for 5.75% and 9.68% of the total catch, respectively. The average sample of 19, 180.08 g, up to 145, 1714.6 g. The temporal pattern analysis showed that the monthly catch weight was similar to the non-stationary random process, and the monthly catch weight of 2002-2009 was simulated by ARIMA. The equation (1-0.387B) (1-B12) lnyt = (1-0.555B12) et ARIMA (1,0,0) (0,1,1) 12 prediction model, the prediction accuracy of the model from 2003 to 2009 was 83.21% ~ 93.90%. An analysis of the sex, age and growth characteristics of all individuals collected in 2005 showed that the ratio of male to female was 1: 2.3. There are 3 age groups of 1 to 3 age in males and 2 age groups of 1 to 2 age in females. The age structure is obviously lower than that of Yaojiang and Qiantang River. The male Von bertalanffy growth equation was: body length Lt = 147.17 × [1-e-0.1648 × (t + 3.2036)], body weight Wt = 44.36 × [1-e-0.1648 × (t + 3.2036)] 2.785; Asymptotic body length L∞ is 147.17 mm, asymptotic body weight W∞ is 44.36 g. Highlights of research: Scape is one of the most common economic fish in the middle and lower reaches of the Yangtze River, but biological data are still scarce at present. In this paper, 237 samples of Catchfish catfish collected from 2002 to 2009 along the Jingjiang section of the Yangtze River were analyzed. The annual, seasonal and monthly distribution patterns were analyzed and the ARIMA prediction model was established. Revealed the sex ratio and age structure of the population, access to the main growth parameters.