应用改进的Leslie法估算东海区小黄鱼资源量

针对Lesile法未考虑自然死亡因素的不足,提出了改进形式的Lesile法,使得该方法也能适用于长渔获周期的资源群体,并结合2009～2010年全国海洋捕捞信息动态采集网络评估的渔业统计结果和东海区渔业资源监测调查资料,估算东海区小黄鱼(Lartmichtlys polyaetis)资源量。结果表明,伏季休渔开捕后可供利用的小黄鱼资源量为16.99×104t,到4月底余存4.65×104t,年平均资源量7.70×104t,最大持续产量8.93×104t,全年开发率达到0.87,处于过度开发状态。

Biomass assessment of Larimichthys polyactis in the East China Sea region by improved Leslie method

Leslie method is unusually used to estimate the fish biomass.An improved calculating method is proposed to remedy the weak point of Leslie method,which does not take into account the natural mortality.Therefore,the new method can be applied to an intense fish stock during a long period of time.Moreover,the calculating of the Larimichthys polyactis biomass in the East China Sea region is based on the statistics from the Network of dynamic data collection of national marine fishing as well as the survey of the fish stock monitoring in the East China Sea in 2009 and 2010.According to the result,the biomass availability was 16.99×104 t at the beginning of the fishing season in September,and 4.65×104 t at the end of April of the next year.The yearly average biomass and MSY were estimated at 7.70×104 t and 8.93×104 t,respectively.The exploitation rate of the L.polyactis reached 0.87,which showed that the species had been overexploited.