The population structure of Protosalanx chinensis is affected by a variety of factors, including water environment, intraspecific differentiation, interspecific competition and commercial fishing. To investigate the growth performance and the current status of resource utilization of P. chinensis in two important fish farming grounds (Dalong Lake and Amuta Lake) in Daqing, Northeast China, we collected 1513 P. chinensis samples from April to December 2018 for measurement and recording the basic biological characteristics. We estimated the parameters including population growth, mortality and exploitation using Von Bertalanffy growth formula, Beverton-Holt model, Pauly's empirical formula and length-based Bayesian biomass estimation method. The results showed that the asymptotic body lengths of Dalong Lake (n=660) and Amuta Lake (n=853) populations were 183.75 and 169.10 mm, respectively. The growth performance indices were both 4.85, and the body mass growth equations were Wt=29.29×(1-e-2.1(t+0.07))3.2977 and Wt=28.72×(1-e-2.5(t+0.07))3.4168, respectively. The ages at inflection were 0.49 a and 0.43 a, and the condition factors were 5.30×10-4±1.38×10-4 and 4.00×10-4±1.61×10-4. The exploitation rates were 0.60 and 0.61, and the relative catch per unit of supplementation were 0.069 and 0.075, respectively. The current differences in population resources between Dalong Lake and Amuta Lake in Daqing were mainly manifested in the parameters related to growth characteristics. The main reason for such differences was changes in the survival conditions of P. chinensis populations after the period of dietary transition induced by the density differences.
受到水环境、种内分化、种间竞争及商业捕捞等多种因素干扰,大银鱼种群资源发生变动。为了解大庆市2个重要的大银鱼生产基地(大龙湖与阿木塔湖)大银鱼种群生长性能及资源利用现状,于2018年4—12月采集大银鱼样本1513尾,进行基础生物学特征测量与记录,利用Von Bertalanffy生长方程、Beverton-Holt模型、Pauly经验公式及基于体长的贝叶斯生物量估算法等估算了种群生长、死亡及开发利用等参数指标。结果表明:大龙湖(n=660)与阿木塔湖(n=853)大银鱼种群渐进体长分别为183.75与169.10 mm;生长性能指数均为4.85;体重生长方程分别为Wt=29.29×(1-e-2.1(t+0.07))3.2977与Wt=28.72×(1-e-2.5(t+0.07))3.4168;拐点年龄分别为0.49与0.43年;肥满度分别为5.30×10-4±1.38×10-4与4.00×10-4±1.61×10-4;开发率分别为0.60与0.61;相对单位补充量渔获量分别为0.069与0.075。现阶段大庆市大龙湖与阿木塔湖大银鱼种群资源差异主要表现在生长特征相关参数,造成差异的主要原因是大龙湖与阿木塔湖大银鱼密度差异导致了食性转变期过后二者生存条件差异明显。.
Keywords:
Amuta Lake; Dalong Lake;