Changes in benthic sediment conditions under an Atlantic salmon farm at a deep, well-flushed coastal site

• Published in: Aquaculture Environment Interactions
• Main Authors: Bannister, Raymond J., Valdemarsen, Thomas Bruun, Hansen, Pia K., Holmer, Marianne, Ervik, Arne
• Format: Article in Journal/Newspaper
• Language: English
• Published: 2014
• Subjects: Aquaculture; Atlantic salmon; Benthic impact; Fauna diversity; Organic enrichment; Salmo salar; Sediment metabolism; Sulphate reduction rates
• Online Access: https://portal.findresearcher.sdu.dk/da/publications/8349b0a0-eacc-4430-862b-bc3a3ccd872b; https://doi.org/10.3354/aei00092

Along the Norwegian coastline, it is predicted that salmonid aquaculture will rapidly expand in the coming years, exceeding current production levels of 1.3 million t in 2012. This will result in increased interactions with both local and regional environments, thus more knowledge is urgently needed to better risk-manage a rapid expansion. We investigated changes in the benthic sediment condition in association with an Atlantic salmon farm sited at a deep, well-flushed coastal site in western Norway. Benthic fluxes of O 2 , total carbon dioxide (TCO 2 ) and NH 4 + intensified over the production cycle, when farming activity and the sedimentation of carbon and nitrogen was at its maximum. During the sampling campaign, benthic fluxes of O 2 , TCO 2 and NH 4 + at the farming location were higher than those measured at a nearby reference location. Stimulation of benthic fluxes over the production cycle at the farming location were most likely driven by changes in benthic faunal community structure, abundance and biomass. High abundances of opportunistic species (i.e. Capitella capitata, Heteromastus filiformis, Paramphinome jeffreysii, Abra nitida and Thyasira sarsii) dominated the farming location, whilst the sediment biogeochemistry was stable throughout the study period at both locations. However, despite differences in benthic fluxes and fauna structure over the production cycle, the input of organic carbon and nitrogen did not exceed the mineralisation capacity of a deep, well-flushed, fish farming location.