摘要
黄鳍金枪鱼(Thunnus albacares)是全球经济和生态价值最重要的鱼类之一,其资源养护和管理受到各方的高度关注。本文依据年龄结构产量模型研究了印度洋黄鳍金枪鱼的资源状态,着重探讨了其生活史特征的不确定性对资源评估结果的影响。研究结果显示,1960-1985年间印度洋黄鳍金枪鱼资源量保持相对稳定,之后开始逐渐下降,相应的捕捞死亡系数也在2010年之后迅速增加,目前其种群可能存在过度捕捞(F2020/FMSY>1,SSB2020/SSBMSY<1)。印度洋黄鳍金枪鱼的资源评估结果对自然死亡系数(M)和亲体-补充量关系陡度参数(h)的改变较为敏感。当h增大时,SSBMSY和初始SSB(即SSB0)的变化较大,分别减少了约25.53万t和34.04万t;F2020/FMSY减小了1.15。当M增大时,F2020/FMSY、SSBMSY、SSB0均减小。综上所述,今后应重视印度洋黄鳍金枪鱼资源的开发程度,重视其资源养护管理,同时充分了解黄鳍金枪鱼的生活史特征,提高自然死亡系数和陡度参数估算的准确性,以期为印度洋黄鳍金枪鱼的资源评估和渔业管理提供更准确的信息,实现该渔业的长期可持续发展。
Yellowfin tuna(Thunnus albacares) is one of the most important fishes with great global economic and ecological value,and its conservation and management have received much concerns.The stock status of yellowfin tuna in the Indian Ocean based on the age-structured assessment program model is evaluated in this study,focusing on the uncertainties of its life history characteristics on the stock assessment results.The results show that the resources of yellowfin tuna in the Indian Ocean remained relatively stable from 1960 to 1985 and then declined gradually,while the fishing mortality coefficient F increased rapidly after 2010.This stock in 2020 may be overfished,since the estimated F_(2020) was greater than F_(MSY)(F that could attain maximum sustainable yield MSY),while spawning stock biomass,SSB_(2020) was less than SSB_(MSY).Sensitivity analysis was also conducted to evaluate the uncertainties of stock assessment.Two important life history characteristics,natural mortality M and steepness of spawningstock relationship h,were analyzed for their influence on the estimates of F,SSB and biological reference points.When h was set to 0.7,0.8,and 0.9,SSB_(MSY) and SSB_(0)(the unfished SSB) reduced by about 255 300 t and 340 400 t;and F_(2020)/F_(MSY) gradually decreased(from 2.88 to 2.21 and 1.73).When the M was set to M_(1)(0.963,0.663,0.548,0.493,0.463,0.446) and M_(2)(1.068,0.735,0.608,0.547,0.514,0.495) respectively,the larger M_(2) leads to lower SSB and F_(2020)/F_(MSY).In summary,the conservation and management of Indian Ocean yellowfin tuna should be tightened in the future to achieve long-term sustainable development of this fishery.The life history characteristics of yellowfin tuna should be fully understood,especially M and h estimation should be improved,to provide more accurate information for stock assessment and fisheries management for Indian Ocean yellowfin tuna.
作者
崔明远
麻秋云
田思泉
林龙山
李渊
Cui Mingyuan;Ma Qiuyun;Tian Siquan;Lin Longshan;Li Yuan(College of Marine Sciences,Shanghai Ocean University,Shanghai 201306,China;National Engineering Research Center for Ocean-ic Fisheries,Shanghai 201306,China;Key Laboratory of Sustainable Exploitation of Oceanic Fisheries Resources,Ministry of Educa-tion,Shanghai 201306,China;Key Laboratory of Sustainable Use of Oceanic Fisheries Resources,Ministry of Agriculture and Rural Af-fairs,Shanghai 201306,China;Third Institute of Oceanography,Ministry of Natural Resources,Xiamen 361005,China)
出处
《海洋学报》
CAS
CSCD
北大核心
2023年第3期40-51,共12页
基金
国家自然科学基金(32202934)
全球变化与海气相互作用(二期)专项(GASI-01-EIND-YD01/02spr/aut)
国家重点研发计划(2019YFD0901404)。
关键词
远洋渔业
种群动力学
敏感性分析
自然死亡
陡度
pelagic fishery
fish population dynamics
sensitivity analysis
natural mortality
steepness
作者简介
崔明远(1994-),男,山东省潍坊市人,博士研究生,主要从事渔业资源评估研究。E-mail:470235020@qq.com*通信作者:麻秋云(1987-),女,讲师,主要从事种群动力学和渔业资源评估研究。E-mail:qyma@shou.edu.cn。
