摘要
秋刀鱼(Cololabis saira)分布于西北太平洋亚热带到温带海域,是中国远洋渔业主要的捕捞对象之一。为探究其资源状况,根据2014—2018年西北太平洋秋刀鱼的渔获体长组成和生物学数据,对体长世代分析(Length-based cohort analysis,LCA)模型和基于生物量的体长世代分析(Biomass-based length-cohort analysis,B-LCA)模型进行性能检验和敏感性分析,并利用蒙特卡洛(Monte Carlo)方法估算模型参数、秋刀鱼资源量、捕捞死亡系数以及最大持续产量。结果表明:1)在5、10和15 mm体长间隔下,LCA和B-LCA模型均表现出优秀的拟合能力,且在5 mm体长间隔下,2种模型的拟合能力均更强;2)LCA模型对于以尾数为单位的渔业数据表现更佳,B-LCA模型对于以质量为单位的渔业数据表现更佳;3)LCA和B-LCA模型对生长因子(b)、渐近体长(L∞)的变化均较敏感,且对b的敏感程度更高;4)LCA模型估算的2014—2018年秋刀鱼平均资源质量约为65.93×10^(4)~171.51×10^(4) t,捕捞死亡系数为0.5292,最大持续产量为37.73×10^(4) t,而B-LCA模型估算的平均资源质量约为47.88×10^(4)~126.25×10^(4) t,捕捞死亡系数为0.5405,最大持续产量为33.02×10^(4) t。2种模型估算的最大持续产量均低于北太平洋渔业委员会(North Pacific Ocean Commission,NPFC)各成员国年均产量(40.98×10^(4) t),表明2014—2018年秋刀鱼资源处于过度捕捞状态。
Being one of the primary fishing targets in Chinese pelagic fishing,Pacific saury(Cololabis saira)is distributed in the subtropical to temperate waters of the northwest Pacific Ocean.In order to explore its resource status,according to the catch at size and biological data of Northwest Pacific saury from 2014 to 2018,we conducted a performance test and a sensitivity analysis on length-based cohort analysis(LCA)model and biomass-based length-cohort analysis(B-LCA)model.Besides,we applied Monte Carlo method to estimate the model parameters,resource quantity,fishing mortality coefficients and maximum sustain-able yield of Pacific saury.The results show that:1)The LCA model and B-LCA model exhibited excellent fitting abilities at 5,10 and 15 mm length intervals,with stronger fitting abilities at 5 mm interval.2)LCA model performed better for fishery data in units of number,while B-LCA model performed better for fishery data in units of mass.3)Both LCA and B-LCA models were b L∞sensitive to changes in growth factor(b)and asymptote length(L∞),with higher sensitivity to b.4)The average resource mass of Pacific saury from 2014 to 2018 estimated by LCA model was about 65.93×10^(4)-171.51×10^(4) t;the fishing mortality coefficient was 0.5292;the maximum sustainable yield was 37.73×10^(4) t.The average resource mass estimated by B-LCA model was about 33.02×10^(4)47.88×10^(4)-126.25×10^(4) t;the fishing mortality coefficient was 0.5405;the maximum sustainable yield was t.The maxi-mum sustained production estimated by both models was lower than the average annual production of NPFC(North Pacific 40.98×10^(4)Ocean Commission)member countries(t),indicating that the Pacific saury resources had been overfished from 2014 to 2018.
作者
方磊
花传祥
朱清澄
FANG Lei;HUA Chuanxiang;ZHU Qingcheng(College of Marine Living Resource Sciences and Management,Shanghai Ocean University,Shanghai 201306,China;National Engineering Research Centre for Oceanic Fisheries,Shanghai 201306,China)
出处
《南方水产科学》
CAS
CSCD
北大核心
2024年第3期8-17,共10页
South China Fisheries Science
基金
国家重点研发计划(2023YFD2401302)。