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Astrid Harendza (Akvaplan-niva) explains seafloor mapping technology to colleague Asle Guneriussen (Photo: Steinar Dahlheim Eriksen/Akvaplan-niva).

Effects from salmon aquaculture on hard and mixed bottom habitats

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Wednesday, December 02, 2020, 00:20 (GMT + 9)

The aquaculture industry in the North is rapidly growing and farm locations are increasingly found in areas where the seabed is formed by hard or mixed substrates, i.e. bedrock, boulders and very coarse substrates. These habitats are dominated by epibenthos, i.e. species which are living on the surface of the substrate. It is challenging to sample epibenthic species and thus little is known about the composition and distribution of epibenthic assemblages. In addition, there is a limited understanding on the impact of organic waste, i.e. how epibenthic species react to faeces and feed spill which are released under production of fin-fish in open net-pens. This information, however, is essential to effective coastal zone management and consequently the sustainable growth of the aquaculture industry.

Example of subtidal epibenthic assemblages on hard/mixed substrate in western Finnmark.(Photo: Akvaplan Niva)

Considering the urgent need for a better understanding of potential impacts of organic enrichment on hard and mixed bottom habitats in northern Norway, the SustainAqua project was initiated by a consortium of international researchers and funded by the Norwegian Research Council in 2017. The four-year long project aimed to characterise epibenthic assemblages commonly found in the vicinity of fish farms in northern Norwegian coastal waters, thus providing a baseline for the area. Subsequently the project emphasis was on the identification of environmental tolerances of the dominant and potentially important marine fauna of these habitats (e.g. sponges, corals, anemones etc.) towards organic enrichment.

Novel survey technologies for hard and mixed bottom habitats. a) Innovative, low-cost towed underwater camera system used to collect visual survey data. b) SIBS ("floc sampler") collects flocculent matter from the substrate surface for microbial eDNA analysis (Photos: Nigel Keeley, IMR).

The goal was to identify alternative biological indicators of ecosystem effects, to facilitate the development of monitoring methods. Two alternate approaches were explored; one based on visual indicators of enrichment, and the other utilizing modern next-generation sequencing techniques of environmental DNA to describe the associated microbial communities. In addition, the project aimed to increase capability to better predict the spatial extent of effects so that impacts to ecologically sensitive or valuable habitats can be avoided. This part of the study involves developing new model input parameters and then improving and testing two of Norway's leading depositional models.

The project is now nearing completion and the project team invited to a two days virtual conference to present the project's outcomes and initiate a discussion on how these can contribute to the development of a new monitoring standard. The conference took place in late October and was well attended with participants from the wider research community, industry and authorities.

ranslocation experiment. a) Using an ROV to collect target epifaunal species. b) Fauna rigs under deployment. c) Fieldlab - measuring respiration after recovery. (Photos: Nigel Keeley, IMR).

To date, SustainAqua has characterised epifaunal assemblages found in the western Finnmark region and developed a new cost-effective method for quantitative video surveys of benthic communities. Resulting data are being used to describe ecological changes and identify potential indicator species. Four target epifauna species (Hormathia digitata, Craniella sp., Drifa florida, Polymastia sp.) have been examined in translocation experiments to identify potential stress indicators using sensitive DNA and to assess waste utilization using fatty acid analyses procedures. An innovative substrate-independent benthic sampler (SIBS) has been developed to sample directly on hard substrates which is proving capable of elucidating organic enrichment gradients based on microbial eDNA. Salmon faeces decay and pellet break up experiments have been conducted to yield new input parameters for depositional models, which have been constructed for the three main study farms.

All conference presentations as well as scientific publications will be made available on the projects website: https://www.hi.no/en/hi/forskning/projects/sustain-aqua.

SustainAqua ("SUSTAINable AQUAculture in the North: identifying thresholds, indicators and tools for future growth"") is led by IMR with Akvaplan-niva, NGO and the Cawthron Institute (New Zealand) as project partners. The project is funded by the Research Council of Norway (MARINFORSK, project #267829), 2017 – 2020.



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