应用体长股分析法估算东海海鳗资源量

Biomass Estimates of Muraenesox cinereus are Calculated by LCA in the East China Sea

海鳗是一种重要的渔业资源,中国海鳗的最高渔获量达到了31.96×104t(2004年),东海区海鳗渔获量最高达到17.67×104t以上(2004年),其中浙江省海鳗最高渔获量为9.02×104t。根据体长股分析法对海鳗资源量进行初步评估,为渔业管理提供参考,研究样品1394尾来自2002～2005年浙江近海拖虾、单拖、帆张网、流刺网等作业的渔获。估算的结果:海鳗自然死亡系数为M=0.15,捕捞死亡系数为F=1.3;东海区海鳗的平均资源量为12.36×104t,平均资源尾数为308.28×106尾,初始资源量为23.41×104t,最大资源尾数为583.99×106尾。

Muraenesox cinereus is key fish species of fishery resources and its catch amounted to historical record 319 600 mt in China in 2004. Especially, catch from East China sea reached at 176, 700 mt and catch from Zhejiang Province was 90, 200 mt, respectively. Stock biomass estimates are calculated by LCA （Length based Cohort Analysis）, Results can provide some reference for fishery management. 1 394 pike eel fish samples were collected from fishing gear of trawl shrimp, beam trawl, stow set net, drift net etc. during 2002-2005. The results showed that natural mortality is M=0.15 ,fishing mortality is F=l.3, the average stock biomass of the fish are 123, 600 mt in 2002-2003, with the number of 308.28×10^6 ind and initial stock biomass are 23,4100 mt, with the number of 583.99×10^6 ind.