Offshore Shellfish Ltd

Eat Mussels. Save the Planet.

Mussels are a natural climate solution:

  • Omega-3 rich, premium protein
  • The lowest-carbon animal protein
  • Lower carbon footprint than tofu
  • No feed, no fertiliser, no freshwater use
  • Actively improve water quality and support marine biodiversity

Our commitment to responsible production is independently verified through:

  • ASC (Aquaculture Stewardship Council) certification
  • Soil Association Organic certification

We continuously monitor our environmental impact, ensuring long-term ecosystem health alongside commercial growth.

Built for Scale. Backed by Science.

Offshore Shellfish is Europe’s only scalable offshore mussel producer — combining regulatory protection, scientific validation and proven offshore engineering.

  • Largest offshore mussel farm in Europe
  • 10,000 tonnes per year production potential
  • 13-year, ongoing and continuous, scientific dataset with Plymouth University
  • Life Cycle Assessment confirms ultra-low carbon footprint
  • Only UK offshore licence at this scale

We continuously monitor our environmental impact, ensuring long-term ecosystem health alongside commercial growth.

This video gives a good insight into our mussel farming activities and why we do what we do and why our ethos is Eat Mussels, Save the Planet.
Here you can watch when Razr came out to the farm to learn more about our sustainable farming methods and why mussels are a true superfood.

Premium Market Access

We supply high-value European markets through strong distribution partnerships, including our “Premier Offshore” collaboration with Krijn Verwijs.

Our award-winning, premium mussels are trusted by chefs, retailers and consumers seeking sustainable seafood without compromise.

30 Years of Responsible Aquaculture

We are a family-run business with over three decades of experience in mussel farming. Our offshore systems, bespoke vessels and decades of technical development position us at the forefront of sustainable aquaculture innovation.

Sustainable Seafood. Scalable Impact.

Offshore Shellfish delivers climate-smart protein at commercial scale — combining environmental integrity, regulatory strength and premium market positioning.

Offshore Shellfish is a family run business, founded by John and Nicki Holmyard, who have been involved in the mussel and seafood industries for 30 years.

Offshore Shellfish are building the UK’s first large-scale fully offshore, rope cultured mussel farm off the coast of South Devon.

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