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Spatial variation in bigeye tuna Thunnus obesus size at sexual maturity in the eastern pacific ocean

Aquaculture and Fisheries 2023年第5期8卷 572-578页

作者： Hongji Huang Cheng Zhou Liuxiong Xu Jiangfeng Zhu Xuefang Wang Jie Cao College of Marine Sciences Shanghai Ocean University999 Huchenghuan RoadLingang New DistrictShanghai201306PR China National Engineering Research Center for oceanic Fisheries Shanghai201306China Department of Applied Ecology Center for Marine Sciences and TechnologyNorth Carolina State UniversityMorehead CityNC28557USA

Understanding the reproductive characteristics of a species is of crucial for accurate stock assessment and management plans to ensure sustainable *** this study,the size at 50%sexual maturity(L50)parameters in different bio-ecological provinces were estimated for bigeye tuna,Thunnus obesus,sampled from the eastern pacific ocean tuna fisheries-dependent survey from 2013 to *** overall sex ratio of the catch during the sampling differed significantly from 1:*** tuna exhibit sexual dimorphism in the growth of males and females,with a clear shift in predominance from female to male with increasing *** the North pacific Sub-tropical Gyre(east)(NPST-east),North pacific Tropical Gyre(NPTG),pacific North Equatorial Countercurrent(PNEC),and pacific Equatorial Divergence(PEQD),females(meals)reached sexual maturity round 102 cm(106 cm),106 cm(100 cm),125 cm(110 cm),and 113 cm(110 cm),respectively,the estimated L50 of bigeye tuna was 124.08 cm,121.97 cm,139.92 cm and 132.45 cm,*** degree of populations mixing between equatorial(PNEC and PEQD)and high-latitude regions(NPST-east and NPTG)is extremely small,but it is reasonably high between the NPST-east and NPTG or PNEC and *** parameters were significantly different,suggesting the occurrence of a spatial difference in the size-at-maturity of bigeye tuna between these bio-ecological *** findings of this study provide the key information for understanding the life history of bigeye tuna in the eastern pacific ocean and will contribute to the conservation and sustainable yield of this species.

关键词： eastern pacific ocean Bigeye tuna Sexual maturity Mixed-effects model

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Examination of seasonal variation of the equatorial undercurrent termination in the eastern Pacifi c diagnosed by ECCO2

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Journal of oceanology and Limnology 2022年第3期40卷 870-890页

作者： Jie WANG Xuezhi BAI Hengling LENG College of oceanography Hohai UniversityNanjing 210098China Key Laboratory of Marine Hazards Forecasting Ministry of Natural ResourcesHohai UniversityNanjing 210098China

Seasonal variations of the equatorial undercurrent(EUC) termination in the eastern pacific,and their mechanism were examined using the Estimating the Circulation and Climate of the ocean,PhaseⅡ(ECCO2).The ECCO2 reproduced a weak and shallow eastward EUC east of the Galapagos Islands,with annual mean transport of half of EUC to the west of the *** diagnosis of zonal momentum equation suggests that the zonal advection(nonlinear terms) drives the EUC beyond the Islands rather than the pressure gradient *** EUC in the Far eastern pacific has the large st core velocity in boreal spring and the smallest one in boreal summer,and its volume transport exhibits two maxima in boreal spring and *** seasonal variability of the EUC in the eastern pacific is dominated by the Kelvin and Rossby waves excited by the zonal winds anomalies in the central and eastern pacific that are associated with the seasonal relaxation or intensification of the trade *** the Far eastern pacific to the east of 120°W,the eastward propagation Kelvin waves play a dominate role in the seasonal cycle of the EUC,results in a semiannual fluctuation with double peaks in boreal spring and autumn.A construction of water mass budget suggests that approximately 24.1% of the EUC water east of 100°W has upwelled to the mixed layer by0.35 m/*** estimated upwelling is stronge st during boreal autumn and weake st during boreal *** is also found that approximately 42.6% of the EUC turns westward to feed the south equatorial current(SEC),13.2% flows north of the equator,and 20.1% flows south of the equator,mainly contributing to Peru-Chile undercurrent.

关键词： equatorial undercurrent termination eastern pacific ocean Estimating the Circulation and Climate of the ocean,Phase II(ECCO2) Peru-Chile undercurrent Galapagos Islands

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