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Atlantic bluefin tuna

Dietary Composition of Atlantic Bluefin Tuna in Skagerrak-Kattegat-Sound Area Discussed

Strategic Insights

— 1 min read

Research findings on the dietary composition of Atlantic bluefin tuna in the Skagerrak-Kattegat-Sound area of the North-East Atlantic have been published. The study analyzed the stomach contents of 44 Atlantic bluefin tuna, captured between 2020 and 2022, and found that the diet was dominated by pelagic schooling fish. The research highlighted the importance of maintaining healthy stocks of garfish, which are not commercially targeted or regulated, to support the continuous return of Atlantic bluefin tuna to the area.

Key Takeaways:

  • The study analyzed the stomach contents of 44 Atlantic bluefin tuna, with lengths between 232 and 295 cm, captured in the Skagerrak-Kattegat-Sound area between 2020 and 2022.
  • The diet of Atlantic bluefin tuna was dominated by pelagic schooling fish, including garfish (22.5% IRI), herring (6.8% IRI), mackerel (6.8% IRI), and various demersal gadoid species (combined 42% IRI).
  • The research found regional variation in dietary composition between Skagerrak and the Sound, indicating that Atlantic bluefin tuna exhibit foraging flexibility.
  • The prevalence of garfish in the diet highlights the importance of maintaining healthy stocks of this species to support the continuous return of Atlantic bluefin tuna to the area.
  • The study was conducted by researchers from the Swedish University of Agricultural Sciences, with funding from citizens in Northern Jutland and western Sweden.
  • The research has been peer-reviewed and published in the journal Fisheries Research.

Statistics:

  • 44 Atlantic bluefin tuna were analyzed in the study, with lengths between 232 and 295 cm.
  • 19 species of teleost fish, 4 species of squid, and 1 species of crab were identified in the diet of Atlantic bluefin tuna.
  • The diet was dominated by pelagic schooling fish, with a combined percentage of index of relative abundance (IRI) of 81.3%.
  • Garfish were found to be the most abundant species in the diet, with an IRI of 22.5%.
  • The study found regional variation in dietary composition between Skagerrak and the Sound, with a difference in the percentage of IRI between the two areas.

Sources:

  • NewsRx. Studies from Swedish University of Agricultural Sciences Describe New Findings in Fisheries Research (New Trophic Insights Associated With the Return of a Top Predator, Bluefin Tuna, To Skagerrak and the Sound). Life Science Weekly. November 4, 2025; p 7092.
  • New Trophic Insights Associated With the Return of a Top Predator, Bluefin Tuna, To Skagerrak and the Sound. Fisheries Research, 2025;291.

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