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为了分析五大连池鳙(Aristichthys nobilis)的生长情况,于2013和2014年在五大连池三池及二池随机采集223尾鳙样本,采用鳞片鉴定其年龄,退算体长、体重。同时采用von Bertalanffy生长方程分析了五大连池鳙体长、体重的生长规律。结果显示,鳙渔获物的平均体长、体重分别为54.61 cm和3 280.53 g,由3+~8+共6个年龄组组成,以5+龄个体为主,占总数的50.67%。五大连池鳙体长(L,cm)、体重(W,g)之间关系式为W=0.0289 L2.901(n=223,R=0.974)。体长、体重von Bertalanffy生长方程分别为:Lt=97.619[1﹣e﹣0.140(ti﹣0.004)]和Wt=17113.260[1﹣e~(﹣0.140(ti﹣0.004))]2.901。鳙体长生长速度曲线无拐点,随着年龄的增加生长速度逐渐降低。体重的生长速度曲线具有拐点,拐点年龄为7.61龄,所对应的体长和体重分别为63.94 cm和5 012.82 g。采用生长特征指数?对比分析五大连池与其他水域鳙的生长,结果显示五大连池鳙的生长较为缓慢,栖息环境的水温、饵料生物密度是影响五大连池鳙生长的重要因素。有效提高鳙生长速度的关键措施在于降低放养密度。
In order to analyze the growth of Aristichthys nobilis, 223 samples of Ephemera were collected at random in 2013 and 2014 in the three pools and two pools of Wudalianchi, and the scales were used to identify their age, body length and body weight. At the same time, using von Bertalanffy growth equation to analyze the growth and body weight of Wudalianchi. The results showed that the average body length and body weight of the catfish were 54.61 cm and 3 280.53 g, respectively, which were composed of 6 age groups from 3 + to 8 +, with individuals aged 5+, accounting for 50.67% of the total. The relationship between the body length (L, cm) and body weight (W, g) of Wudallazondai was W = 0.0289 L2.901 (n = 223, R = 0.974). Body length and body weight von Bertalanffy growth equation were: Lt = 97.619 [1-e-0.140 (ti-0.004)] and Wt = 17113.260 [1-e ~ (-0.140 (ti-0.004))] 2.901.鳙 body growth curve without inflection point, with increasing age, the growth rate gradually decreased. Body weight growth curve with inflection point, inflection point age of 7.61 years, corresponding body length and weight were 63.94 cm and 5 012.82 g. The growth characteristic index was used to compare the growth of the Wudalianchi and other waters. The results showed that the growth of the Wudalianchi was slow. The water temperature of the habitat and the biological density of the food were the important factors affecting the growth of the Wudalianchi. The key measure to effectively increase the growth rate is to reduce the stocking density.