Examining fish movement in terms of advection or diffusion: a case study of northeastern Atlantic cod

Regitze B. C. Lundgreen*, Anders Nielsen, Marie Krüger-Johnsen, David Righton, Monica Mion, Krzysztof Radtke, Maris Plikshs, Ari J. Leskelä, Jari Raitaniemi, Christopher A. Griffiths, Michele Casini, Uwe Krumme, Karin Hüssy

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review


Advection (directional movement) and diffusion (dispersed movement) were applied for the first time to describe movement patterns in Atlantic cod in the North Sea and Baltic Sea between 1955 and 2020. The advection-diffusion approach provided more detailed estimates of movement that corresponded to previously observed patterns using different analytical techniques. Spatial patterns were evident with greater movement distances in cod from the North Sea and eastern Baltic Sea compared to the western Baltic and Kattegat-Skagerrak. Furthermore, comparative case studies on different ecotypes in the western and eastern Baltic suggested that inshore cod were more resident compared to offshore cod. This preliminary study highlights the usefulness of the advection-diffusion method to describe movements in fish populations, and can be further expanded by incorporating information on environment and mortality and providing information to spatially explicit population models.
Original languageEnglish
JournalMarine Ecology Progress Series
Pages (from-to)115-129
Number of pages15
Publication statusPublished - 2022


  • Atlantic cod
  • Movement
  • Advection-diffusion
  • Mark-recapture
  • Baltic sea
  • North sea


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