论文部分内容阅读
利用2012年3月—2013年2月在鄱阳湖通长江水道进行的定置网渔获物调查的数据,运用软件Fi SATⅡ对鲢的生长参数以及种群补充模式进行了估算。结果表明:鄱阳湖通长江水道鲢体长范围为81~835 mm;体长(L/mm)和体质量(W/g)的关系式为W=3.987×10-5L2.850(R2=0.964,n=893),von Bertalanffy生长方程的各参数为:渐近体长L∞=879.38 mm,生长系数K=0.100,理论生长起点年龄t0=-1.141。总死亡系数Z=0.520a-1,自然死亡系数M=0.245a-1,捕捞死亡系数F=0.275a-1。鄱阳湖通长江水道鲢开发率E=0.529,存在资源过度利用的趋势。种群补充模式表明,鄱阳湖通长江水道鲢种群补充期出现在6—10月份,因此,建议适当调整禁渔期,以利于其资源的恢复与保护。
Based on the data from the survey conducted at the Poyang Lake Yangtze River waterway from March 2012 to February 2013, the growth parameters of silver carp and the pattern of population supplementation were estimated using Fiat II software. The results showed that the range of the body length of silver carp in Poyang Lake was 81 ~ 835 mm; the relation between body length (L / mm) and body weight (W / g) was W = 3.987 × 10-5L2.850 (R2 = 0.964 , n = 893). The parameters of the von Bertalanffy growth equation are: asymptotic body length L∞ = 879.38 mm, growth coefficient K = 0.100, and the theoretical growth starting point age t0 = -1.141. Total mortality Z = 0.520a-1, natural mortality M = 0.245a-1, fishing mortality F = 0.275a-1. The Poyang Lake-Yangtze River waterway silver carp development rate E = 0.529, there is the tendency of over-utilization of resources. The population supplementation model shows that the supplement period of the carp and silver carp populations in the Poyang Lake through the Yangtze River is occurring from June to October. Therefore, it is suggested that the period of closed fishing should be properly adjusted so as to facilitate the recovery and protection of its resources.