Early life history affects fish size mainly by indirectly regulating the growth during each stage:a case study in a demersal fish  

作　　者：Rui Wu Qinghuan Zhu Satoshi Katayama Yongjun Tian Jianchao Li Kunihiro Fujiwara Yoji Narimatsu 

机构地区：[1]Frontiers Science Center for Deep Ocean Multispheres and Earth System(FDOMES)and Key Laboratory of Mariculture,Ministry of Education,Ocean University of China,5 Yushan Road,Qingdao,266003,China [2]Graduate School of Agricultural Science,Tohoku University,1-1 Tsutsumidori Amamiyamachi,Aoba,Sendai,981-8555,Japan [3]Laboratory for Marine Fisheries Science and Food Production Processes,Pilot National Laboratory for Marine Science and Technology,Qingdao,266237,China [4]Niigata Field Station,Fisheries Resources Institute,Japan Fisheries Research and Education Agency,Yokohama,220-6115,Japan [5]Hachinohe Field Station,Fisheries Resources Institute,Japan Fisheries Research and Education Agency,Yokohama,220-6115,Japan

出　　处：《Marine Life Science & Technology》2023年第1期75-84,共10页海洋生命科学与技术（英文）

基　　金：This work was financially supported by China Scholarship Council(202006330094).

摘　　要：The complex life histories of demersal fishes are artificially separated into multiple stages along with changes in morphology and habitat.It is worth exploring whether the phenotypes expressed earlier and later during the life cycle are related or decoupled.The life stages of first year Pacific cod(Gadus macrocephalus)were tracked over different hatch years and regions to test whether the early life history had a long-lasting effect on subsequent growth.We further explored the contribution of growth in the early and subsequent life history stages to body size at the end of each stage.In addition to the accessory growth centre and the first annual ring,the other two checks on the otolith possibly related to settlement and entering deeper waters were identified in 75 Pacific cod individuals.The direct and indirect relationships among the life history stages was interpreted based on path analysis.The results showed that growth prior to the formation of the accessory growth centre had a significant effect on the absolute growth of the fish before and after settlement and migration to deep water.However,there was no or moderate evidence that early growth affected the body size at each stage,which was mainly regulated by growth during the stage.This study supports the lasting effect of early growth and clarifies that it affects size mainly by indirectly regulating staged growth.Quantifying the phenotype relationships and identifying the internal mechanisms form the basis for assessing population dynamics and understanding the processes behind the changes.

关 键 词：Early life history Gadus macrocephalus OTOLITH Path analysis Staged growth Body size 

分 类 号：Q178[生物学—水生生物学]