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A study to analyse fish waste and feed impact on seabed in Scottish open areas. (Photo: SAIC)

Salmon farming impact on Orkney seabed analysed

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Friday, October 06, 2017, 02:40 (GMT + 9)

A collaborative project to improve understanding of the effects of salmon farming on the seabed in high-energy waters is underway in Orkney, with co-funding from the Scottish Aquaculture Innovation Centre (SAIC).

The three-year project is being developed by Cooke Aquaculture Scotland in partnership with researchers from the Scottish Association for Marine Science (SAMS) and Dalhousie University in Nova Scotia, Canada.

The initiative will inform the environmental monitoring and management of more exposed sites along Scotland’s west coast and the Northern Isles and, potentially, unlock additional capacity.

Currently, the benthic impacts of salmon farming – the impact of fish waste or uneaten feed on the seabed – are monitored by industry regulator, the Scottish Environment Protection Agency (SEPA), using the DEPOMOD model developed by SAMS, which is based largely on data gathered from sheltered, in-shore sea lochs.

However, SAIC explains that at more exposed sites such as those found off the coast of Orkney and Shetland, where this same waste matter is dispersed more widely by strong tides and where the seabed is harder and rockier, the benthic impacts can differ significantly from those reflected in the current model.

“This shortfall in knowledge about dispersive sites is hampering both regulation and production. With better data about the benthic footprint at these sites, salmon producers like Cooke can improve environmental monitoring and compliance, and potentially increase production – both in terms of farming existing sites and developing new sites,” pointed out Says Chris Webb, Environment and Development Manager, at Cooke Aquaculture.

The research team, led by SAMS, will field-sample and analyse data from up to three dispersive sites around Orkney over a complete production cycle.

This data will then inform the development of the NewDEPOMOD model and its use in SEPA’s proposed Depositional Zone Regulation (DZR).

“With greater knowledge comes better regulation and better farming, and that’s what this project is all about. One of SAIC’s priorities is to unlock additional capacity for aquaculture development, and this project could do exactly that, by providing industry and regulators alike with the knowledge to manage and farm our seas ever more productively, and ever more sustainably,” commented Heather Jones, CEO at SAIC.

The total project value is GBP 231,907, of which SAIC is contributing GBP 90,460 (39 per cent).
 

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