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<p>The marine biological carbon pump is a key process in the global carbon cycle, with mesopelagic fish playing a crucial role by facilitating the transport of organic carbon from surface waters to the deep ocean through diel vertical migration (DVM). This process enhances carbon sequestration in mid-depth waters and influences carbon flux at the air-sea interface. Despite their significant biomass, the contribution of mesopelagic fish to carbon export fluxes remains poorly quantified at both global and regional scales. This review synthesizes current research on carbon export mediated by mesopelagic fish DVM, focusing on relevant carbon fluxes in the open ocean and deep regions of marginal seas (e.g., basins, continental slopes, and canyon systems) where mesopelagic fish are known to occur. The review discusses the methods used to quantify these fluxes, the associated challenges, and the implications for global carbon cycling. Finally, the review proposes future research directions to improve our understanding of the role of mesopelagic fish in marine ecosystems and their impact on ocean carbon dynamics in the context of climate change.</p>

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Advances in understanding mesopelagic fish contributions to ocean carbon export

  • 期刊论文

  • 发表日期：

    2026年4月29日

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  • Yuanjie Li,
  • Wupeng Xiao,
  • Zengchao Xu,
  • Min Bao,
  • Jun Zhang,
  • Yane Jiang,
  • Zuozhi Chen,
  • Bangqin Huang

摘要

The marine biological carbon pump is a key process in the global carbon cycle, with mesopelagic fish playing a crucial role by facilitating the transport of organic carbon from surface waters to the deep ocean through diel vertical migration (DVM). This process enhances carbon sequestration in mid-depth waters and influences carbon flux at the air-sea interface. Despite their significant biomass, the contribution of mesopelagic fish to carbon export fluxes remains poorly quantified at both global and regional scales. This review synthesizes current research on carbon export mediated by mesopelagic fish DVM, focusing on relevant carbon fluxes in the open ocean and deep regions of marginal seas (e.g., basins, continental slopes, and canyon systems) where mesopelagic fish are known to occur. The review discusses the methods used to quantify these fluxes, the associated challenges, and the implications for global carbon cycling. Finally, the review proposes future research directions to improve our understanding of the role of mesopelagic fish in marine ecosystems and their impact on ocean carbon dynamics in the context of climate change.