Spatial Distribution and Growth Variability of Juveniles of Two Myctophid Species (Myctophum asperum and Symbolophorus evermanni) in Relation to Environmental Factors in the Kuroshio Current System in Winter

IF 1.9 2区农林科学 Q2 FISHERIES

Fisheries Oceanography Pub Date : 2024-10-29 DOI:10.1111/fog.12706

Kazunari Higashiguchi, Mikio Watai, Junji Kinoshita, Chiyuki Sassa, Hiroshi Kuroda, Takeshi Okunishi, Tohya Yasuda, Akinori Takasuka

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Abstract

The distribution and growth rate of juveniles of two myctophid species (Myctophum asperum and Symbolophorus evermanni) were examined in relation to environmental factors, based on samples collected in the Kuroshio Current system during winter from 2020 to 2022. The growth rate of juveniles was compared among three oceanic regions: the inshore side of the Kuroshio axis, the Kuroshio axis, and the offshore side of the Kuroshio axis in relation to sea surface temperature (SST), sea surface salinity (SSS), chlorophyll-a concentration (CHL), and biomass of zooplankton (ZPB). M. asperum juveniles were distributed mainly in the inshore region and the Kuroshio axis of higher CHL and ZPB, whereas S. evermanni juveniles were distributed mainly in the Kuroshio axis and in the offshore regions of higher SST and SSS. No significant difference in growth rate was found among the three regions for M. asperum juveniles, whereas the growth rate of S. evermanni juveniles in the Kuroshio axis was higher than in the offshore regions. No environmental factors were selected for growth rate of M. asperum in the GLMM, whereas SST was selected for S. evermanni. M. asperum juveniles can be considered to have a higher tolerance for variability in environmental factors, whereas water temperature could be the driver for the distribution and growth rate of S. evermanni. Lastly, we discuss possible interspecific interactions among noncommercial fish (myctophids) and commercial fish (Pacific saury Cololabis saira).

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冬季黑潮系统中两种真菌幼虫的空间分布和生长变异与环境因子的关系

以2020 - 2022年冬季黑潮系统为研究对象，研究了两种真菌（Myctophum asperum和Symbolophorus evermanni）幼虫的分布和生长速率与环境因子的关系。比较了黑潮轴近岸侧、黑潮轴近岸侧和黑潮轴近岸侧3个海洋区域幼鱼生长速率与海表温度（SST）、海表盐度（SSS）、叶绿素-a浓度（CHL）和浮游动物生物量（ZPB）的关系。黑穗草幼鱼主要分布在CHL和ZPB较高的近岸地区和黑潮轴，而长尾草幼鱼主要分布在海温和SSS较高的近岸地区和黑潮轴。黑潮中轴的长势明显高于近海，而黑潮中轴的长势明显高于近海。在GLMM中，没有选择影响粗粒霉生长速率的环境因子，而选择影响evermanni生长速率的环境因子。粗粒棘球蚴幼体对环境因子的变化具有较高的耐受性，而水温可能是其分布和生长速度的驱动因素。最后，我们讨论了非商业鱼类（嗜菌鱼）和商业鱼类（太平洋刀鱼）之间可能的种间相互作用。

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来源期刊

Fisheries Oceanography 农林科学-海洋学

CiteScore

5.00

自引率

7.70%

发文量

审稿时长

>18 weeks

期刊介绍： The international journal of the Japanese Society for Fisheries Oceanography, Fisheries Oceanography is designed to present a forum for the exchange of information amongst fisheries scientists worldwide. Fisheries Oceanography: presents original research articles relating the production and dynamics of fish populations to the marine environment examines entire food chains - not just single species identifies mechanisms controlling abundance explores factors affecting the recruitment and abundance of fish species and all higher marine tropic levels