Cod. Illustration: Elisabeth Karlsson

PhD defence about the movement behavior of Atlantic cod

Tuesday 22 Nov 22



Karin Hüssy
Senior Researcher
DTU Aqua
+45 35 88 34 58


This PhD was funded by the European Maritime and Fisheries Fund (EMFF) and the Danish Fisheries Agency through the project ‘Management of mixed cod stocks in the transition zone between the North Sea and the Baltic Sea: How can this be achieved most efficiently?’ (FABBIO). Funding was also provided by BalticSea2020 through the project ‘Tagging Baltic Cod’ (TABACOD).

On 6 December, Regitze Benedicte Carlstedt Lundgreen will defend her PhD thesis. It is possible to attend the defence at DTU in Lyngby or online.

Movement behaviour in fish species can be complex, and the Atlantic cod (Gadus morhua) is no exception. While some individuals rarely move far from their home range, others can swim hundreds of kilometers to spawn, feed, or overwinter. If the movement behaviour is not considered, it can be difficult to properly assess the state of the cod stocks.

During her PhD study at DTU Aqua, Regitze Benedicte Carlstedt Lundgreen has examined historical movement patterns of cod in the Baltic Sea and the North Sea to improve our understanding of its complex movement behaviour. She has also analyzed the effect of the environment on movement.

This was done by digitalizing and analyzing about 70 years of mark-recapture tagging data from approximately 17,000 fish and using these data in simulations to see if cod may adjust their movement to find the best habitats.

The results of Regitze Benedicte Carlstedt Lundgreen suggest very different movement behaviour among stock components, with western Baltic cod being more resident overall compared to cod from the eastern Baltic Sea and North Sea. The results also indicate that oxygen levels could be an important driver for cod distributions.

In addition, the cod in the Sound appears to be relatively isolated from the rest of the Baltic aside from Kattegat which might have implications for management.

About the PhD defence

Regitze Benedicte Carlstedt Lundgreen will defend her PhD thesis "Spatial and temporal dynamics of movements in eastern Atlantic cod" on Tuesday 6 December 2022, 13:00 on Zoom and at DTU, Asmussens Allé, 2800 Kgs. Lyngby, building 303A, auditorium 41.


  • Principal supervisor: Senior Researcher Karin Hüssy, DTU Aqua
  • Co-supervisor: Professor Anders Nielsen, DTU Aqua


  • Senior Researcher Niels Jepsen, DTU Aqua (chair)
  • Senior Scientist Johan Lövgren, Swedish University of Agricultural Sciences, Sweden
  • Associate Professor Matthew Witt, University of Exeter, UK

Chairperson at defence

  • Senior Researcher Jane W. Behrens, DTU Aqua
Learn more

A copy of the thesis is available by e-mail on request. Please contact Karin Stubgaard,

How to participate in the defence


Everybody is welcome to attend Regitze Benedicte Carlstedt Lundgreen's PhD defence at DTU, Asmussens Allé, 2800 Kgs. Lyngby, building 303A, auditorium 41.


The defence can be followed online on Zoom using this link: 

Please, enter the meeting 10 minutes prior to the defence proceedings are scheduled to start. All participants are muted per default, but we ask you to double check that your microphone is turned off at all times. There will be instructions regarding the proceedings in the beginning of the defence.


Tuesday 6 December 2022, 13:00-16:00.