Skip to main page content
U.S. flag

An official website of the United States government

Dot gov

The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you’re on a federal government site.

Https

The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

Access keys NCBI Homepage MyNCBI Homepage Main Content Main Navigation
. 2021 Oct;99(4):1280-1291.
doi: 10.1111/jfb.14832. Epub 2021 Jul 14.

Sea trout Salmo trutta in the subarctic: home-bound but large variation in migratory behaviour between and within populations

John Fredrik Strøm  1 , Jenny L A Jensen  2 , Anna Nikolopoulos  1 , Eivind Nordli  3 , Pål Arne Bjørn  1 , Thomas Bøhn  1
Affiliations

Sea trout Salmo trutta in the subarctic: home-bound but large variation in migratory behaviour between and within populations

John Fredrik Strøm et al. J Fish Biol. 2021 Oct.

Abstract

Anadromous brown trout (sea trout), Salmo trutta, is currently in decline throughout its range, largely due to anthropogenic stressors in freshwater and marine habitats. Acoustic telmetry was utilized to study the marine migration of sea trout post-smolts from three populations in a relatively pristine subarctic fjord system. While at sea, the sea trout spent a substantial part of their time close to their natal river, preferred near shore over pelagic habitats and were strongly surface oriented. Despite a fidelity towards local areas, the sea trout utilized various parts of the fjord system, with maximum dispersion >30 km and total migration distance >300 km. Almost half of the sea trout (44%) migrated between river outlets, indicating that a metapopulation approach may be appropriate when managing neighbouring sea trout populations at high latitudes. Furthermore, the different populations displayed different migratory behaviours in terms of distance migrated, dispersion from origin and the likelihood of leaving their home area. This variation in migratory behaviour is likely influenced by spatiotemporal differences in habitat quality between sites, indicating that local habitat variations may promote population-specific behavioural responses even in relatively confined fjord systems.

Keywords: anadromous salmonids; behavioural variability; depth use; habitat use; high-latitude; migration.

PubMed Disclaimer

References

REFERENCES

    1. Anon. (2019). Classification of the state of 430 Norwegian sea trout populations. Report from the Norwegian Scientific Advisory Committee for Atlantic Salmon, p. 150.
    1. Aspillaga, E., Bartumeus, F., Linares, C., Starr, R. M., López-Sanz, À., Díaz, D., … Hereu, B. (2016). Ordinary and extraordinary movement behaviour of small resident fish within a mediterranean marine protected area. PLoS One, 11, e0159813.
    1. Atencio, B. J., Thorstad, E. B., Rikardsen, A. H., & Jensen, J. L. A. (2021). Keeping close to the river, shore, and surface: the first marine migration of brown trout (Salmo trutta) and Arctic charr (Salvelinus alpinus) post-smolts. Journal of Fish Biology, 1-10.
    1. Barton, K. (2020). MuMIn: multi-model inference. R package version 1.43.17.
    1. Berg, O. K., & Jonsson, B. (1990). Growth rate and mortality of anadromous brown trout, Salmo trutta, from the Vardnes River, northern Norway. Environmental Biology of Fishes, 29, 145-154.

LinkOut - more resources