CoDINA - Cod: DIet and food web dyNAmics

What determines the menu of the Barents Sea cod - a model study on the cod's diet and the Barents Sea food web

About the project

CoDINA aims to increase the understanding of pelagic food web dynamics in sub-Arctic ecosystems. This we will do by studying the interaction between Barents Sea cod and its prey. We will examine the mechanisms generating predator- prey interactions to gain a deeper understanding of trophic connections in the BS.

We are interested in how these may change within the annual cycle, between years and spatially as a consequence of dynamics internal to a single population or between populations and how the functionality is influenced by external pressures like climate and fishing. Cod have been important predators in many ecosystems in the North Atlantic, but their ecological significance has generally diminished with reduced abundance. In contrast, the cod stock in the BS is at a record high level. This is a well-studied and data-rich stock, but still large holes remain in our knowledge. Some of these knowledge gaps are related to how the function of cod in the ecosystem may vary in space and time and how this may be detected in spatiotemporal patterns in their diet.

While earlier studies mainly have built on data from the 1980s and onward, we in the proposed project have a unique opportunity to also include the 1930s-1960s, including a warm (until the mid 1950s), but until now data poor period. Newly digitized Cefas diet data for BS cod from this period will be used in unison with data from the joint IMR-PINRO stomach content database (1984-), the PINRO field feeding analysis data (1947-1985), population and hydrographic data from IMR,PINRO ICES and other sources.

Based upon these data and the project team's joint expertise in a variety of analysis and modelling approaches we anticipate to move significant steps forward towards successful modelling, understanding and (ecosystem-based) management of the Barents Sea cod stock and its main prey species.

We further expect that (parts of) the knowledge provided will be transferable to other marine sub-Arctic systems.




<Participating departments/centres, time frame, theoretical basis, scientific method, etc.>

CoDINA will be led by the Norwegian Institute of Marine Research with Geir Ottersen as the project manager, and Bjarte Bogstad, Edda Johannesen and Daniel Howell as other key researchers. The project is in collaboration with CEES at the University of Oslo, the Fisheries Research Institute PINRO in Murmansk, Russia and CEFAS and the University of Sheffield in the UK.



This Project is funded by the Research Council of Norway (RCN) (MARINFORSK)

RCN Project Number: 255460 (Project data bank at RCN)

UiO Project Number: 190700




01.06.2016 - 31.01.2021


  • Rørvik, Carl Jakob; Bogstad, Bjarte; Ottersen, Geir & Kjesbu, Olav Sigurd (2022). Long-term interplay between harvest regimes and biophysical conditions may lead to persistent changes in age at sexual maturity of Northeast Arctic cod (Gadus morhua). Canadian Journal of Fisheries and Aquatic Sciences. ISSN 0706-652X. 79(4), p. 576–586. doi: 10.1139/cjfas-2021-0068. Full text in Research Archive
  • Townhill, Bryony; Holt, Rebecca Emma; Bogstad, Bjarte; Durant, Joël; Pinnegar, John K. & Dolgov, Andrey V. [Show all 9 contributors for this article] (2021). Diets of the Barents Sea cod (Gadus morhua) from the 1930s to 2018. Earth System Science Data. ISSN 1866-3508. 13(3), p. 1361–1370. doi: 10.5194/essd-13-1361-2021. Full text in Research Archive
  • Holt, Rebecca Emma; Hvingel, Carsten; Agnalt, Ann-Lisbeth; Dolgov, Andrey V.; Hjelset, Ann Merete & Bogstad, Bjarte (2021). Snow crab (Chionoecetes opilio), a new food item for North-east Arctic cod (Gadus morhua) in the Barents Sea. ICES Journal of Marine Science. ISSN 1054-3139. 78(2), p. 491–501. doi: 10.1093/icesjms/fsaa168. Full text in Research Archive
  • Durant, Joel Marcel; Molinero, Juan Carlos; Ottersen, Geir; Reygondeau, Gabriel; Stige, Leif Christian & Langangen, Øystein (2019). Contrasting effects of rising temperatures on trophic interactions in marine ecosystems. Scientific Reports. ISSN 2045-2322. 9:15213, p. 1–9. doi: 10.1038/s41598-019-51607-w. Full text in Research Archive
  • Stige, Leif Christian; Rogers, Lauren; Neuheimer, Anna B.; Hunsicker, Mary E.; Yaragina, Natalia A. & Ottersen, Geir [Show all 9 contributors for this article] (2019). Density‐ and size‐dependent mortality in fish early life stages. Fish and Fisheries. ISSN 1467-2960. 20(5), p. 962–976. doi: 10.1111/faf.12391. Full text in Research Archive
  • Fall, Johanna Jennifer Elisabeth & Fiksen, Øyvind (2019). No room for dessert: A mechanistic model of prey selection in gut-limited predatory fish. Fish and Fisheries. ISSN 1467-2960. p. 1–17. doi: 10.1111/faf.12415. Full text in Research Archive
  • Holt, Rebecca Emma; Bogstad, Bjarte; Durant, Joel Marcel; Dolgov, Andrey & Ottersen, Geir (2019). Barents Sea cod (Gadus morhua) diet composition: long-term interannual, seasonal, and ontogenetic patterns. ICES Journal of Marine Science. ISSN 1054-3139. 76(6), p. 1641–1652. doi: 10.1093/icesjms/fsz082. Full text in Research Archive
  • Langangen, Øystein; Stige, Leif Christian; Kvile, Kristina Øie; Yaragina, Natalia A.; Skjæraasen, Jon Egil & Vikebø, Frode Bendiksen [Show all 7 contributors for this article] (2018). Multi-decadal variations in spawning ground use in Northeast Arctic haddock (Melanogrammus aeglefinus). Fisheries Oceanography. ISSN 1054-6006. 27(5), p. 435–444. doi: 10.1111/fog.12264.

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  • Johannesen, Edda; Dolgov, Andrey V. & Ottersen, Geir (2018). The role of cod in the decline in arctic fishes in the Barents sea. Full text in Research Archive

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Published Feb. 4, 2021 2:17 PM - Last modified Feb. 5, 2021 2:04 PM