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Large-scale salmon farming in Norway impacts the epiphytic community of Laminaria hyperborea

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Haugland, BT, Armitage, CS, Kutti, T, Husa, V, Skogen, MD, Bekkby, T, Carvajalino-Fernandez, MA, Bannister, RJ, White, CA ORCID: 0000-0003-2061-6462, Norderhaug, KM and Fredriksen, S 2021 , 'Large-scale salmon farming in Norway impacts the epiphytic community of Laminaria hyperborea' , Aquaculture Environment Interactions, vol. 13 , pp. 81-100 , doi: 10.3354/aei00392.

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Abstract

Large-scale finfish farms are increasingly located in dispersive hard-bottom environments where Laminaria hyperborea forests dominate; however, the interactions between farm effluents and kelp forests are poorly understood. Effects of 2 levels of salmonid fish-farming effluents (high and low) on L. hyperborea epiphytic communities were studied by sampling canopy plants from 12 sites in 2 high-energy dispersive environments. Specifically, we assessed if farm effluents stimulated fast-growing epiphytic algae and faunal species on L. hyperborea stipes—as this can impact the kelp forest community composition—and/or an increased lamina epiphytic growth, which could negatively impact the kelp itself. We found that bryozoan biomass on the stipes was significantly higher at high-effluent farm sites compared to low-effluent farm and reference sites, resulting in a significantly different epiphytic community. Macroalgal biomass also increased with increasing effluent levels, including opportunistic Ectocarpus spp., resulting in a less heterogeneous macroalgae community at high-effluent farm sites. This habitat heterogeneity was further reduced by the high bryozoan biomass at the high-effluent sites. Such changes in the epiphyte community could have implications for the faunal community that relies on the epiphytes for food and refuge. On the kelp lamina, no clear response to farm effluents was found.

Item Type: Article
Authors/Creators:Haugland, BT and Armitage, CS and Kutti, T and Husa, V and Skogen, MD and Bekkby, T and Carvajalino-Fernandez, MA and Bannister, RJ and White, CA and Norderhaug, KM and Fredriksen, S
Keywords: Laminaria hyperborea, kelp, epiphytes, epiphytic community, Salmo salar, Atlantic salmon, Norway, Bryozoa
Journal or Publication Title: Aquaculture Environment Interactions
Publisher: Inter-Research
ISSN: 1869-7534
DOI / ID Number: 10.3354/aei00392
Copyright Information:

Copyright 2021 the authors. Licensed under Creative Commons Attribution 4.0 International (CC BY 4.0) https://creativecommons.org/licenses/by/4.0/

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