吉力湖鳙生长特性研究

Studies on the Growth Characteristics of Bighead Carp in Jili Lake

为探究吉力湖鳙生长规律,实行科学放养与捕捞,选择吉力湖鳙体质量、体长、年龄3个指标,分析其生长特性。结果表明,吉力湖鳙处于匀速生长状态,一方面由于近年来吉力湖水体浮游动物的生物量相对丰富,可以满足吉力湖鳙种群的摄食量和生长需求;另一方面吉力湖渔业生产部门在鳙的苗种投放与商品鱼捕捞过程中,做到科学投放与捕捞,较好地维持了吉力湖浮游动物生物量与鳙种群密度间的生态平衡。指出,保持现有吉力湖鳙的放养密度与捕捞强度是最佳选择。

The growth characteristics of bighead carp(Aristichthys nobilis)are analysed by selecting three indexes of weight,body length and age,in order to explore the growth law of bighead carp in Jili lake,and to guide the stocking and fishing of bighead carp.The results showed that:Bighead carp in Jili Lake is growing at a constant speed.The reason is on the one hand the biomass of zooplankton in Jili lake is relatively rich in recent years,which could meet the feeding and growing needs of the bighead carp’s populationin,on the other hand the fishery production department of Jili lake has achieved scientific releasing and fishing in the process of releasing seedling and fishing commercial fish of bighead carp,which has well maintained the ecological balance between the existence of animal biomass and the population density of bighead carp in Jili lake.It is pointed out that maintaining the stocking density and fishing intensity of bighead carp in Jili lake is the best choice.