西北太平洋柔鱼是我国远洋渔业重要的捕捞对象,综合考虑生物、经济和社会效益来科学制定渔业管理目标是确保柔鱼资源可持续利用的重要研究内容。本文根据1996—2011年我国鱿钓船在西北太平洋海域捕捞的柔鱼渔获量和作业成本,结合贴现率和渔获物价格等经济数据,构建基于贴现率的西北太平洋柔鱼生物经济模型。结果表明,西北太平洋柔鱼资源状况处于良好状态,并未遭受过度捕捞;当贴现率α在0.3⁰.5之间,当前利益占长远利益的20%~30%(D=0.2⁰.3),且渔获物价格在9 195~12 500元/t之间时,该海域的柔鱼资源种群资源量相对稳定,能达到最优种群数量水平,可保证柔鱼渔获量始终处在MSY之下,确保柔鱼资源的可持续利用。

Neon flying squid(Ommastrephes bartramii)in the Northwestern Pacific Ocean is an important commercial fishing target in the distant waters of our country.How to determine the goal of fisheries management by considering the biology,economic and society is one of the important contents in the sustainable utilization of fishery.In this paper,a dynamic bio-economical model was established using fishery catch data and fishing economic data from the squid fishery in China mainland during the period 1996to 2011,and considering the effect of the discount rate on resources exploitation of O.bartramii in the Northwest Pacific Ocean.The dynamic bio-economical model was designed to estimate the stock and yield under different management goals.An appropriate discount rate is used to determinate the number of Daccepted by current society,which is the proportion of immediate interests.The discounted supply curve was plotted for investigation into the development and management of fishery resources carried out in the catch prices.Results show that the fishery resources in the Northwest Pacific Ocean were in good condition,and not overfishing.The discount rate ranged between 0.3and 0.5,and the short-term interests accounted for 20%~30%(D=0.2⁰.3)of the long-term interests.When the catch prices are about 9 195~12 500Yuan per ton,the stock resources were relatively stable and could achieve the optimal stocks level,it can ensure that the catch of Neon flying squid is less than the maximum sustainable yield(MSY),and the fishing effort can be effectively controlled for the resources of neon flying squid. This study provides some guidance for scientific management of fishery resources.