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<p>Large sharks are among the only known predators of marine mammals, but few direct observations of sharks preying on marine mammals have been recorded. Here, we present novel aerial observations of a dusky shark (<i>Carcharhinus obscurus</i>) killing and consuming a gray seal (<i>Halichoerus grypus</i>) in the waters off Nantucket, MA, USA. Based on additional footage obtained by beachgoers and boaters, at least three other gray seals were consumed by dusky sharks in the area during the summer of 2023. Though the observations we present are preliminary, they have changed our understanding of the trophic ecology of the species, which is considered endangered on a global scale, as well as predatory interactions between sharks and seals in the waters off Massachusetts.</p>

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Dusky sharks actively prey on gray seals

  • 期刊论文

  • 发表日期：

    2025年8月27日

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  • Megan V. Winton,
  • Ashleigh J. Novak,
  • Victoria L. Migneco,
  • John Chisholm,
  • Gregory B. Skomal

摘要

Large sharks are among the only known predators of marine mammals, but few direct observations of sharks preying on marine mammals have been recorded. Here, we present novel aerial observations of a dusky shark (Carcharhinus obscurus) killing and consuming a gray seal (Halichoerus grypus) in the waters off Nantucket, MA, USA. Based on additional footage obtained by beachgoers and boaters, at least three other gray seals were consumed by dusky sharks in the area during the summer of 2023. Though the observations we present are preliminary, they have changed our understanding of the trophic ecology of the species, which is considered endangered on a global scale, as well as predatory interactions between sharks and seals in the waters off Massachusetts.