基于Pella-Tomlinson生物经济模型的东、黄海鲐资源开发策略

Development strategy of Scomber japonicus based on Pella-Tomlinson bio-economic model in East China Sea and Yellow Sea

根据1998-2015年中国鲐灯光围网生产的统计数据、日本西海区水产研究所的评估结果和相关经济数据,基于Pella-Tomlinson模型推算东、黄海鲐的最大可持续产量(maximum sustainable yield,MSY)、生物经济平衡点(bioeconomic equilibrium,BE)和最大经济产量(maximum economic yield,MEY)以及相应的捕捞努力量。考虑不同的管理目标,对fMSY、fBE和fMEY取不同权重,设计出10种不同的捕捞计划,比较在不同捕捞方式下鲐5年、10年和20年的生物效益、经济效益和社会效益。研究发现:东、黄海鲐的资源丰度逐年下降;加强捕捞努力量的投入会对经济效益、产量和资源量造成严重的影响;权衡生物、经济和社会目标,确定策略10为最适捕捞策略,即fMSY、fBE和fMEY的权重取值分别为0.25、0.25和0.50,此策略下5年内累计的利润和产量分别为30.19亿元和132.02万t,5年后的资源量为86.73万t。

Based on the catch data of purse seine fishery of China from 1998 to 2015 and Japanese Resource Assessment of Chub mackerel and economic data, the Pella-Tomlinson model was used to calculate the Maximum Sustainable Yield(MSY), Bio-economic Equilibrium(BE),Maximum Economic Yield(MEY) and their corresponding fishing efforts. Taking into account different factors of biology, economy and society, 10 different fishing schemes was designed to compare the biological, economic and social benefits for 5 years,10 years and 20 years. The results show that the resource abundance of the Chub mackerel in East China Sea and the Yellow Sea decreased year by year;Increaseing investment in fishing effort will have a serious impact on economic,output and resources. The study determined that considering the biological, economic and social factors, Option 10 is the optimal fishing strategy, i.e. the weights of fMSY,fBE and fMEY are 0.25, 0.25 and 0.50. The accumulated profit and output of 5 years under this strategy will be 3.019 billion yuan and 1 320 200 tons, and the resources will be 867 300 tons 5 years later.