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Journal of Applied Phycology

, Volume 26, Issue 2, pp 933–945 | Cite as

Cost-effective IMTA: a comparison of the production efficiencies of mussels and seaweed

  • Susan L. Holdt
  • Maeve D. Edwards
Article

Abstract

This paper compares the biofilter capacity and cost-effectiveness of blue mussels (Mytilus edulis) and seaweed for use in integrated multi-trophic aquaculture (IMTA) based on experiences in Ireland and Denmark. This comparison shows that weight for weight, mussels are a better biofilter than seaweed with regard to the amount of nitrogen assimilated. Furthermore, in optimized systems, areal requirement for mussels is similar to the cultivation of the same tonnage (1,000 t) of seaweed (approximately 8 ha). The cost-effectiveness of a mussel biofilter is €11–30 kg−1 nitrogen (N) removed based on various examples compared to production costs of €209–672 removed and €1,013 kg−1 N removed, respectively, for Laminaria digitata and Alaria esculenta from extrapolated laboratory and field trials. However, commercial seaweed (Saccharina latissima) producers claim that production costs are less than €10–38 kg−1 N removed. These up-scaled and commercial figures make the seaweed cost competitive to mussels for removal of nitrogen. Disadvantages such as predators (e.g. eider ducks) and biofouling should also be taken into account before choice of biofilter is made. These drawbacks can reduce overall biofilter capacity and biomass value as a consequence of biomass spoilage or loss. However, disadvantages may be mitigated by seasonal choice of cultivation and harvest times. Cultivation technologies and harvesting methods may be improved together with breeding to improve the cost-efficiency of the biofilter, especially in the newer European seaweed cultivation. Furthermore, upscaling of IMTA to commercial proportions, other than the Danish example, would allow more real data on production costs and revenues.

Keywords

Integrated multi-trophic aquaculture Saccharina latissima Mytilus edulis Marine aquaculture Nitrogen removal Biofilter Kelp 

Notes

Acknowledgments

The authors wish to acknowledge funding from the Energetic Algae project (EU Interreg IVB NWE Strategic Initiative) and the Kombiopdræt project (The Danish AgriFish Agency (GUDP)—3405-11-0375). We would like to thank Rasmus Bjerregaard (Seaweed Seed Supply, Denmark) and Michael Murphy (Dingle Bay Seaweed) for providing figures on commercial seaweed cultivation. We also would like to thank one of the anonymous reviewers for their particularly helpful and detailed comments and suggestions.

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Copyright information

© Springer Science+Business Media Dordrecht 2014

Authors and Affiliations

  1. 1.DTU Environment, Department of Environmental EngineeringTechnical University of DenmarkKgs. LyngbyDenmark
  2. 2.Carna Research Station and the Irish Seaweed Research Group, The Ryan InstituteNUI GalwayGalwayIreland
  3. 3.National Food InstituteTechnical University of DenmarkKgs. LyngbyDenmark

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