Loch Duart working with regulators for wrasse use for sea lice control


Press release – 12 March 2018

By the end of 2017, Loch Duart had the lowest historical lice counts on all sites, even during ‘peak lice’ periods of warmer water.  Loch Duart reduced treatments significantly and saw thriving salmon growth on all sites.

Loch Duart, the independent salmon farming company based in Sutherland and the Hebrides, has also been praised by Inshore Fisheries and Conservation Authorities in England for their conservative approach to sourcing wrasse for the use as cleaner fish.

The south coast of England in 2016 provided Loch Duart with a prime source of high quality ballan wrasse (Labrus bergylta) and turned the company’s sea lice (Lepeophtheirus salmonis) position around within the space of a year.

Loch Duart representatives met with IFCA officials (Inshore Fisheries and Conservation Authority) in December 2017. It was strongly agreed that regulation and close monitoring of the fishery is required and led by Loch Duart, as an example of best practice.

Loch Duart plans having “the first medicinal free year” for the control of sea lice and will be developing wrasse husbandry skills to achieve this.

Lewis Bennett, Loch Duart Cleaner Fish Coordinator, says:

“When fishermen started catching wild wrasse for Loch Duart in 2016 the fishery was basically open to anyone. The risk of the fishery being over exploited was high even in these wrasse rich locations. Loch Duart found that the key regulatory and advisory bodies developed innovative management measures which were nothing short of outstanding.

“Loch Duart and the rest of the industry is making the transition from wild caught wrasse to farmed wrasse.  Meanwhile Loch Duart will continue to work closely with authorities including Southern IFCA, Cornwall IFCA , Natural England and Cefas (The Centre for Environment, Fisheries and Aquaculture Science), using their knowledge and experience to protect the fisheries and allow sustainable use of wild wrasse by aquaculture.”
Colin Trundle, Principle Scientific Officer of Cornwall IFCA said:

Cornwall IFCA officers have been very pleased that Loch Duart appears to be using the best available scientific evidence to ensure that they are sourcing cleaner fish responsibly. While their ongoing research has enabled them to minimise the numbers of fish they require from the wild capture fishery, they have also adopted fishery guidance set out by the south coast IFCAs where the fishery is carried out and have implemented voluntary measures based on the guidance that will contribute to the sustainability of the fishery

Key learnings relating to Wrasse use:

  • Loch Duart has built a close working relationship with Cefas, IFCA, Natural England & all fishermen involved.
  • Loch Duart’s experience and small-scale farming allows for only ballan wrasse to be used as cleaner fish.
  • Through the unique stocking strategy and fishing policy, Loch Duart has reduced its annual requirement for wild caught ballan wrasse, meaning the company requires less than (<) 1% of the Scottish annual requirement.
  • Loch Duart does not support the use of mixed species wrasse. Our fishermen release all other wrasse species including Corkwing (Symphodus melops), Rockcook (Centrolabrus exoletus), Goldsinny (Ctenolabrus rupestris) & Cuckoo (Labrus mixtus).
  • The availability of wrasse from the South of England was highlighted by local fishermen. Their sizes are more varied, suggesting an even distribution of populations and generations of fish, which suggests good habitat & warmer water temperatures.
  • There is currently no regulation in Scotland on Wrasse fishing. Loch Duart is currently working with Marine Scotland officials to set in place standards and fishery guidance.
  • Loch Duart has focused on specific size ranges and specific fishing periods (avoiding breeding periods) backed by ongoing scientific data collection and research.
  • To optimise health and survival of wild caught Wrasse, Loch Duart has a short holding policy prior to transport to reduce stress and minimises handling at all stages.
  • Loch Duart is developing a cleaner fish specific transport system with the RSPCA to ensure best quality and best welfare of the small number of fish transported.


Further enquiries for Loch Duart:    Graeme Thomson, Spreng Thomson

M: +44 (0)7774 546909  E: [email protected]


Editors Notes:

  • Loch Duart Ltd is an independent Scottish salmon farm based in North West Scotland founded on the principle of farming in a sustainable manner, while making no compromise in its aim to produce the best tasting salmon available.
  • Producing around 5,000 tonnes per year, it employs 115 people in the Hebrides and Sutherland.
  • The salmon is sold to leading hotels, restaurants and retailers across the world.
  • Loch Duart’s unique farming methods include low density farming, a unique rotational fallowing system, swim-throughs and feed from sustainable sources to ensure lean, fit fish.
  • Loch Duart’s industry leading innovations include:
  • The first fish farm in the world to achieve RSPCA Freedom Food approval.
  • Loch Duart’s unique strategy of long term rotational fallowing optimised for each sea site according to conditions and fish numbers.
  • In 2004, specifying sustainably sourced marine ingredients from traceable, identifiable lots for its salmon feed.
  • Inventing a drum filter which can filter sea water down to 100 micron to collect any parasites and their eggs in the heavy water flows taken from the pens.
  • In 2015 securing a source of capelin ‘trimmings’ for all the company’s fishmeal requirements to enhance the sustainability and quality criteria of Loch Duart salmon feed.
  • Practising ‘environmental enrichment’ in their fresh water operations to stimulate the young salmon and improve welfare.