基于体长的北部湾带鱼单位补充量亲体量研究

Research on Length-based Yield Per Recruit and Spawning-biomass Per Rrecruit of Trichiurus lepturus in Beibu Gulf

根据当前捕捞死亡系数,运用2种基于体长的B-H式单位补充量亲体量模型(Spawning biomass per recruit,SBR),评估了北部湾的带鱼资源状况。当前北部湾带鱼的SBR为42.07g,相当于初始亲体量的4.82%,表明现阶段北部湾的带鱼资源处于过度利用状态,以捕捞低龄鱼为主。放大开捕体长和降低捕捞强度是恢复亲体资源量的有效手段。

Two kinds of length based Beverton and Holt spawning biomass per recruit（SBR） models were used to evaluate the Trichiurus lepturus stock in Beibu Gulf according to current fishing mortality. The data indicated that the absolute value of SBR was 42.07 g,which was about 4.82% of that of the initial stock under the equilibrium condition,and this level suggested that it was recruitment overfishing and the majority of catch was young fish. Enlarging length at first capture and decreasing fishing mortality were effective means to rebuild the spawner biomass.