Aquaculture Environment Interactions
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DOI: https://doi.org/10.3354/aei00500
copiedFatty acid composition of northern shrimp Pandalus borealis in relation to salmon aquaculture locations in northern Norway
- Guldborg Søvik
- Siri Aaserud Olsen
- Agneta Hansen
- Stian Stiansen
- Einar Magnus Nilssen
- Pål Arne Bjørn
- Sonnich Meier
ABSTRACT:
The fatty acid (FA) content of northern shrimp Pandalus borealis sampled on commercial shrimp fishing grounds in 2 fjords in northern Norway was analyzed to elucidate if the shrimp feed on aquaculture waste from salmon aquaculture farms. Shrimp were sampled in February and June 2021 in 1 fjord without farms (Balsfjord) and 1 fjord with farms (Kvænangen), at varying distances from the farms (1.5 to 13.3 km). A laboratory experiment conducted as part of our study showed that the FA profile of shrimp feeding on salmon feed pellets changed toward the FA profile of the pellets. The terrestrial FAs 18:2n-6 and 18:3n-3 changed the most and were chosen as suitable FA trophic markers (FATMs) for identifying feeding on aquaculture waste by shrimp in the fjords. The terrestrial FATMs were not detected at elevated levels in the lipids of the shrimp from Kvænangen, indicating that none of the sampled shrimp had been feeding on aquaculture waste. FA analysis has the potential to inform diet studies, and we found differences in the shrimp diet between and within the fjords as well as seasonal differences. Calanus finmarchicus was a more abundant prey in outer Kvænangen compared with inner Kvænangen and Balsfjord, while shrimp at the latter 2 sites had a higher content of benthic FATMs. At all sites, C. finmarchicus constituted a more important food item in winter than in summer.
KEYWORDS
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Guldborg Søvik (Corresponding Author)
- Institute of Marine Research, Nordnesgaten 50, 5005 Bergen, Norway
Siri Olsen (Co-author)
- Institute of Marine Research, Nordnesgaten 50, 5005 Bergen, Norway
Agneta Hansen (Co-author)
- Institute of Marine Research, Framsenteret, Hjalmar Johansens gate 14, 9007 Tromsø, Norway
Stian Stiansen (Co-author)
- Institute of Marine Research, Nye Flødevigveien 20, 4817 His, Norway
Einar Nilssen (Co-author)
- Institute of Marine Research, Framsenteret, Hjalmar Johansens gate 14, 9007 Tromsø, Norway
- Department of Arctic and Marine Biology, UiT The Arctic University of Norway, 9019 Tromsø, Norway
Pål Bjørn (Co-author)
- Institute of Marine Research, Framsenteret, Hjalmar Johansens gate 14, 9007 Tromsø, Norway
Sonnich Meier (Co-author)
- Institute of Marine Research, Nordnesgaten 50, 5005 Bergen, Norway
Handling Editor:
Adam Hughes, Oban, UK
Reviewers:
V. A. Laudicella and 1 anonymous referee
Acknowledgements:
The study was funded by Troms and Finnmark counties through the project ‘Coexistence fishery and aquaculture: effects of salmon farming on shrimp and cod—Coexist’ (contract FHAV-2019-082) as well as by the Norwegian Ministry of Trade, Industry and Fisheries through the Norwegian Institute of Marine Research project ‘Coastal shellfish resources’ in the research program Coastal Ecosystems. The Norwegian Research Council projects ‘Assessing cumulative impacts on the Norwegian coastal ecosystem and its services—CoastRisk’ (project no. 299554) and ‘Impacts of salmon farming on Atlantic cod stocks—Salcod’ (project no. 29463) are also thanked for funding. Eskil Dahl Olaussen was responsible for collecting shrimp samples during the 2 UiT surveys. We thank the technical staff at the Flødevigen research station for their assistance in laboratory work during the feeding experiment. The authors also thank Therese Smith-Jahnsen Aase and Arve Fossen for technical assistance with the lipid analysis and 2 anonymous referees for constructive and useful comments on an earlier version of the manuscript.