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<p>Advances in life-history research on Atlantic bluefin tuna (ABT; <i>Thunnus thynnus</i>) have informed management measures that supported population recovery amid intensifying human pressures. However, movement data from the eastern Mediterranean (EMED) remain scarce, limiting understanding of basin-scale connectivity. Here, we deployed pop-up satellite archival tags on six ABT off Israel and incorporated two additional individuals tagged in Canada and Norway that subsequently entered the EMED to examine movements in relation to oceanographic conditions. Across 1563 daily positions and 995 archival days, ABT occupied the Levantine and Aegean Seas during summer under warm, stratified conditions consistent with surface-oriented reproductive behaviour. In one individual, high-resolution archival data provided the first behavioural indication of putative spawning in this region. Late-summer dispersal revealed two patterns: EMED residency and westward migration to overwintering grounds in the western Mediterranean, with some individuals continuing into the North Atlantic Ocean. The northern Balearic–Ligurian region emerged as the primary foraging ground for contingents across the Mediterranean, highlighting the need for management that accounts for sub-basin structure and seasonal mixing.</p>

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Seasonal migration patterns of Atlantic bluefin tuna (Thunnus thynnus) occupying the eastern Mediterranean Sea

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年8月1日

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  • Eyal Bigal,
  • Camille M. L. S. Pagniello,
  • Keno Ferter,
  • Michael R. Castleton,
  • Robert J. Schallert,
  • Barbara A. Block

摘要

Advances in life-history research on Atlantic bluefin tuna (ABT; Thunnus thynnus) have informed management measures that supported population recovery amid intensifying human pressures. However, movement data from the eastern Mediterranean (EMED) remain scarce, limiting understanding of basin-scale connectivity. Here, we deployed pop-up satellite archival tags on six ABT off Israel and incorporated two additional individuals tagged in Canada and Norway that subsequently entered the EMED to examine movements in relation to oceanographic conditions. Across 1563 daily positions and 995 archival days, ABT occupied the Levantine and Aegean Seas during summer under warm, stratified conditions consistent with surface-oriented reproductive behaviour. In one individual, high-resolution archival data provided the first behavioural indication of putative spawning in this region. Late-summer dispersal revealed two patterns: EMED residency and westward migration to overwintering grounds in the western Mediterranean, with some individuals continuing into the North Atlantic Ocean. The northern Balearic–Ligurian region emerged as the primary foraging ground for contingents across the Mediterranean, highlighting the need for management that accounts for sub-basin structure and seasonal mixing.