基于单位补充量模型的浙江南部海域蓝圆鲹资源评价  

Assessment for Japanese Scad Decapterus maruadsi Fishery in Offshore Waters of Southern Zhejiang Based on Per Recruitment Model

作　　者：崔明远 田思泉[1,2,3,4] 麻秋云 范青松 CUI Mingyuan;TIAN Siquan;MA Qiuyun;FAN Qingsong(College of Marine Sciences,Shanghai Ocean University,Shanghai 201306,China;National Engineering Research Center for Oceanic Fisheries,Shanghai 201306,China;The Key Laboratory of Sustainable Exploitation of Oceanic Fisheries Resources,Ministry of Education,Shanghai 201306,China;Key Laboratory of Oceanic Fisheries Exploitation,Ministry of Agriculture and Rural Affairs,Shanghai 201306,China;Zhejiang Mariculture Research Institute,Wenzhou 325000,China)

机构地区：[1]上海海洋大学海洋科学学院,上海201306 [2]国家远洋渔业工程技术研究中心,上海201306 [3]大洋渔业资源可持续开发教育部重点实验室,上海201306 [4]农业农村部大洋渔业开发重点实验室,上海201306 [5]浙江省海洋水产养殖研究所,浙江温州325000

出　　处：《水产科学》2022年第5期727-737,共11页Fisheries Science

基　　金：国家自然科学基金资助项目(41906074,31902372);浙江省渔业资源专项调查项目(158053)。

摘　　要：依据2015—2018年在浙江南部海域底拖网调查数据,研究蓝圆鲹的生活史参数,采用单位补充量模型分析其渔业开发状态,并探讨死亡系数、捕捞选择性对资源评估的影响。蓝圆鲹渐近叉长的估计值为26.00 cm,生长速率为0.19/a,自然死亡系数(M)为0.55,总死亡系数(Z)为1.41,当前捕捞死亡系数(F)为0.86。根据单位补充量渔获量模型和单位补充量亲体生物量模型,估计在不同自然死亡系数和捕捞选择性下单位补充量渔获量和单位补充量亲体生物量随捕捞死亡系数的变化曲线。当前蓝圆鲹的F_(0.1)为0.596,F_(max)估计值为3.602,F_(20%)为0.421,F_(40%)为0.220,当前捕捞强度远大于防止补充型过度捕捞警戒线F_(20%)。当自然死亡系数由0.35增至0.85时,当前单位补充量渔获量和单位补充量亲体生物量变化幅度较大,分别为10.29和0.79。蓝圆鲹拐点叉长为17.79 cm,临界叉长为13.58 cm,当前开捕叉长(12.76 cm)远小于其初次性成熟叉长,表明当前捕捞压力过大。浙江南部海域蓝圆鲹虽尚未处于生长型过度捕捞状态(F_(0.1)<F<F_(max)),但已处于补充型过度捕捞状态。为维持蓝圆鲹渔业资源的可持续发展,建议合理降低捕捞强度,提高开捕叉长,加强资源养护和管理。单位补充量模型结果对参数敏感,提高相关参数的精确性对模型准确估计至关重要。The objective of this study was to assess the fishery and to provide biological reference points for the fisheries management of Japanese scad Decapterus maruadsi in the East China Sea.Specifically,we analyzed the life history traits and conducted the yield per recruitment(YPR)model and spawning stock biomass per recruitment(SSBR)model for Japanese scad.Through the scientific survey in offshore waters of Southern Zhejiang from 2015 to 2018,Japanese scad were collected and measured for the body length(cm)and body weight(g).The asymptotic length L∞ was estimated to be 26.00 cm by ELEFANⅠmethod,with the exponential rate of 0.19/a.Based on the length-converted catch curve,total mortality Z was estimated to be 1.41.The natural mortality M was found to be 0.55 estimated by Pauly empirical formula,according to the above growth parameters and the water temperature.Therefore,the fishing mortality F was 0.86.Based on all above estimates for life history parameters,the yield per recruitment and spawning stock biomass per recruitment models were projected for Japanese scad.The biological reference points F_(max) and F_(0.1) were 3.602 and 0.596,respectively.The values of F_(20%) and F_(40%) were 0.421 and 0.220,respectively estimated from spawning stock biomass per recruitment model.The current fishing intensity is far greater than the warning line to prevent supplementary overfishing(F_(20%)).Different M(0.35,0.45,0.55,0.65,0.75,and 0.85)and different fork length of first capture(11.21 cm,11.87 cm,12.76 cm,14.00 cm,and 15.83 cm)were considered in the sensitivity analysis of yield per recruitment and spawning stock biomass per recruitment models.When M was increased from 0.35 to 0.85,the estimates for the current yield per recruitment and the current spawning stock biomass per recruitment were reduced by 10.29 and 0.79,respectively.Fork length of inflecting point was 17.79 cm,critical fork length was 13.58 cm,and the current catchable size(12.76 cm)was much smaller than the fork length of first sexual maturity,which indi

关 键 词：东海 蓝圆鲹 生活史特征 种群动力学 渔业管理 

分 类 号：S931[农业科学—渔业资源]