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<p>In recent years, the northern Bering Sea (NBS) fish assemblage has changed, where rising water temperatures have correlated with increases in abundance of sub-arctic fish species. One such species is the Pacific halibut (<i>Hippoglossus stenolepis</i>), a commercially important flatfish that has largely been unstudied within the NBS. To assess Pacific halibut within the region, we attached pop-up satellite telemetry tags on large individuals in the NBS during the summer months. Our objectives were to characterize depths and temperatures occupied by Pacific halibut, identify the timing, magnitude, and destination of Pacific halibut migratory movements, and assess the scale of those movements&#xa0;compared to current management practice. Tagged Pacific halibut remained within the Bering Sea but made relatively large-scale seasonal movements within the basin. During autumn, all Pacific halibut made offshore migrations to the continental shelf edge, reaching as far south as the Pribilof Islands and as far north as Russian waters along the Kamchatka Peninsula. Individuals remained in offshore waters throughout the winter, likely for spawning purposes, where they occupied conditions as cold as − 1.9 °C and as deep as 696&#xa0;m. Fish returned to relatively warm, shallow waters near their initial tagging locations in early summer, an indication of inter-annual site fidelity and homing to NBS foraging areas. This study provides the first evaluation of Pacific halibut at their northernmost extent, with findings indicating that individuals in the NBS display fine-scale spatial dynamics representative of migratory foraging contingent behavior.</p>

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Characterizing seasonal movements and environmental conditions of Pacific halibut in the northern Bering Sea

  • 期刊论文

  • 发表日期：

    2025年8月20日

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  • Austin J. Flanigan,
  • Julie K. Nielsen,
  • Tim Loher,
  • Andrew C. Seitz

摘要

In recent years, the northern Bering Sea (NBS) fish assemblage has changed, where rising water temperatures have correlated with increases in abundance of sub-arctic fish species. One such species is the Pacific halibut (Hippoglossus stenolepis), a commercially important flatfish that has largely been unstudied within the NBS. To assess Pacific halibut within the region, we attached pop-up satellite telemetry tags on large individuals in the NBS during the summer months. Our objectives were to characterize depths and temperatures occupied by Pacific halibut, identify the timing, magnitude, and destination of Pacific halibut migratory movements, and assess the scale of those movements compared to current management practice. Tagged Pacific halibut remained within the Bering Sea but made relatively large-scale seasonal movements within the basin. During autumn, all Pacific halibut made offshore migrations to the continental shelf edge, reaching as far south as the Pribilof Islands and as far north as Russian waters along the Kamchatka Peninsula. Individuals remained in offshore waters throughout the winter, likely for spawning purposes, where they occupied conditions as cold as − 1.9 °C and as deep as 696 m. Fish returned to relatively warm, shallow waters near their initial tagging locations in early summer, an indication of inter-annual site fidelity and homing to NBS foraging areas. This study provides the first evaluation of Pacific halibut at their northernmost extent, with findings indicating that individuals in the NBS display fine-scale spatial dynamics representative of migratory foraging contingent behavior.