水产学报2024，Vol.48Issue(1)：68-81,14.DOI:10.11964/jfc.20211113155
浙江南部海域银姑鱼的生活史参数估算及资源评价
Estimations of life history parameters and stock assessment for silver croaker(Pennahia argentata)in offshore waters of southern Zhejiang
摘要
Abstract
While silver croaker(Pennahia argentata)is an economically and ecologically important species in the East China Sea,researches on its life history traits,stock assessment and fishery management are limited in recent years.Given the increasing fishing intensity and great changes of ecosystem,limited studies of P.argentata would lead to misunderstanding of its stock status and difficulties in its conservation and management.Based on samples from the scientific survey in the offshore waters of southern Zhejiang in 2016,this study intends to understand the life history of P.argentata(growth,maturity,and mortality),to evaluate the stock status and to provide manage-ment advice.This study analyzed the life history traits based on the widely used and empirical methods,i.e.von Bertalanffy growth function for growth parameters,logistic maturity curve,and Pauly empirical formula for mor-tality coefficients.The yield per recruitment(YPR)and spawning stock biomass per recruitment(SSBR)models were constructed,considering the influence of natural mortality and selectivity.The asymptotic length of P.argentata was estimated to be 25.36 cm,and the exponential rate was 0.32 in the growth function.The current length of 50%selectivity(13.52 cm)was much smaller than the length of first sexual maturity(17.79 cm).Based on the length-converted catch curve,the total mortality of P.argentata was estimated to be 2.62.The Pauly empir-ical formula estimated the natural mortality M to be 0.74,while the fishing mortality estimate was 1.88.Results of YPR and SSBR models revealed that the biological reference points Fmax and F0.1 were 3.43 and 0.78,while F20%and F40%were estimated to be 0.66 and 0.33,respectively.The current fishing intensity was much higher than F20%,indicating recruitment overfishing for this stock.Scenarios considering different natural mortality(M=0.54,0.64,0.74,0.84 and 0.94)and different selectivity(age of 50%selectivity:t50=1.47,1.77,2.07,2.37 and 2.67),were evaluated in the sensitivity analysis for YPR and SSBR models.When M increased from 0.54 to 0.94,the estimates for the current YPR would decrease from 17.69 to 10.48,and the current SSBR would slightly decrease from 0.82 to 0.57.When the t50 increased,both YPR and SSBR declined in different degrees.Both YPR and SSBR,including the biological reference points,were sensitive to M and selectivity.The stock of P.argentata.in offshore waters of southern Zhejiang has been recruitment overfished in 2016,and both natural mortality and selectivity have substantial influence on the stock assessment and management advices for this fishery.Therefore,it is recommended to reduce the fishing intensity and increase the first capture length in order to improve the con-servation and management of P.argentata.关键词
银姑鱼/生长死亡/单位补充量模型/渔业管理/浙江南部Key words
Pennahia argentata/growth and mortality/per recruitment model/fishery management/southern Zhejiang分类
农业科技引用本文复制引用
任采妮,麻秋云,戴小杰,叶深..浙江南部海域银姑鱼的生活史参数估算及资源评价[J].水产学报,2024,48(1):68-81,14.基金项目
国家自然科学基金(41906074,31902372) （41906074,31902372）
浙江省渔业资源专项调查(158053) National Natural Science Foundation of China(41906074,31902372) （158053）
Fisheries Resource Sur-vey of Zhejiang Province,China(158053) （158053）
