Modelling the cultivation and bioremediation potential of the kelp Saccharina latissima in close proximity to an exposed salmon farm in Norway

Ole Jacob Broch; Ingrid Helene Ellingsen; Silje Forbord; Xinxin Wang; Zsolt Volent; Morten Omholt Alver; Aleksander Handå; Kjersti Andresen; Dag Slagstad; Kjell Inge Reitan; Yngvar Olsen; Jorunn Skjermo

doi:10.3354/aei00080

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AEI 4:187-206 (2013) - DOI: https://doi.org/10.3354/aei00080

Modelling the cultivation and bioremediation potential of the kelp Saccharina latissima in close proximity to an exposed salmon farm in Norway

Ole Jacob Broch^1,2,*, Ingrid Helene Ellingsen¹, Silje Forbord^1,2, Xinxin Wang³, Zsolt Volent¹, Morten Omholt Alver^1,4, Aleksander Handå^1,2, Kjersti Andresen³, Dag Slagstad¹, Kjell Inge Reitan^1,2, Yngvar Olsen^1,2,3, Jorunn Skjermo^1,2

¹SINTEF Fisheries and Aquaculture, PO Box 4762 Sluppen, 7465 Trondheim, Norway
²Norwegian Seaweed Technology Center, c/o SINTEF Fisheries and Aquaculture, PO Box 4762 Sluppen, 7465 Trondheim, Norway
³Department of Biology, Centre of Fisheries and Aquaculture, and ⁴Department of Engineering Cybernetics, Norwegian University of Science and Technology (NTNU), 7491 Trondheim, Norway

*Email: ole.jacob.broch@sintef.no

ABSTRACT: A 3-dimensional hydrodynamic-ecological model system (SINMOD) was used to estimate the full-scale cultivation potential of the brown alga Saccharina latissima in integrated multi-trophic aquaculture (IMTA) with Atlantic salmon Salmo salar. A previously developed model for the frond size and composition (carbon and nitrogen content) of S. latissima sporophytes was adjusted to data from an outdoor mesocosm growth experiment and then coupled and run online with the 3-dimensional model system. Results from simulations were compared with data from an IMTA field experiment, providing partial validation of the hydrodynamic–ecological–kelp model system. The model system was applied to study the large-scale cultivation potential of S. latissima in IMTA with salmon and to quantify its seasonal bioremediation potential. The results suggest a possible yield of 75 t fresh weight S. latissima ha^-1 in 4 mo (February to June) and about 170 t fresh weight ha^-1 in 10 mo (August to June). The results further suggest that the net nitrogen consumption of a 1 ha S. latissima installation in the vicinity of a fish farm producing approximately 5000 t salmon in a production cycle is about 0.36 (0.15) t NH₄⁺-N, or a removal of 0.34% (0.41%) of the dissolved inorganic nitrogen effluent with a cultivation period from August (February) to June. Due to the differing seasonal growth patterns of fish and kelp, there was a mismatch between the maximum effluent of NH₄⁺-N from the fish farm and the maximum uptake rates in S. latissima.

KEY WORDS: Saccharina latissima · Integrated multi-trophic aquaculture · Mathematical model · Bioremediation · High resolution ecological model · Salmon farming · Marine biomass

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Cite this article as: Broch OJ, Ellingsen IH, Forbord S, Wang X and others (2013) Modelling the cultivation and bioremediation potential of the kelp Saccharina latissima in close proximity to an exposed salmon farm in Norway. Aquacult Environ Interact 4:187-206. https://doi.org/10.3354/aei00080

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AEI 4:187-206 (2013) - DOI: https://doi.org/10.3354/aei00080

Modelling the cultivation and bioremediation potential of the kelp Saccharina latissima in close proximity to an exposed salmon farm in Norway

Ole Jacob Broch1,2,*, Ingrid Helene Ellingsen1, Silje Forbord1,2, Xinxin Wang3, Zsolt Volent1, Morten Omholt Alver1,4, Aleksander Handå1,2, Kjersti Andresen3, Dag Slagstad1, Kjell Inge Reitan1,2, Yngvar Olsen1,2,3, Jorunn Skjermo1,2

Ole Jacob Broch^1,2,*, Ingrid Helene Ellingsen¹, Silje Forbord^1,2, Xinxin Wang³, Zsolt Volent¹, Morten Omholt Alver^1,4, Aleksander Handå^1,2, Kjersti Andresen³, Dag Slagstad¹, Kjell Inge Reitan^1,2, Yngvar Olsen^1,2,3, Jorunn Skjermo^1,2