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Scottish project to test hemp in salmon aquafeeds

The project team has begun an initial feasibility trial to assess the impact of hemp protein on fish health and wellbeing, looking at factors such as digestibility and nutritional value.

Rare Earth Global crops
Rare Earth Global crops

August 22, 2022

In a global first, a UK producer of hemp crops is taking its first steps into the aquaculture sector that could see the alternative plant-based protein source used as a key ingredient for Atlantic salmon feeds.

Rare Earth Global, growers of industrial hemp for a range of sustainable products, has received £50,000 funding from the UK Seafood Innovation Fund (SIF) to explore how hemp seeds could be integrated into the diets of farmed salmon in Scotland. With support from the Sustainable Aquaculture Innovation Centre (SAIC) and the University of Stirling’s Institute of Aquaculture, the project team has begun an initial feasibility trial to assess the impact of hemp protein on fish health and wellbeing, looking at factors such as digestibility and nutritional value.

Hemp-based protein is already sold for human consumption as a plant-based nutritional supplement as well as being used in cattle and poultry farming. However, the results of this study could see locally grown hemp being introduced as a core feed ingredient in aquaculture for the first time.

Initial indications suggest that protein content of up to 50% could be achieved from the plants grown on UK soil, exceeding producers’ minimum requirements of 35%, as well as reducing the sector’s reliance on imported ingredients such as soy and fishmeal.

The concept of using the hemp seeds as an effective protein source forms part of Rare Earth Global’s zero-waste approach to hemp farming, which ensures that every part of the plant is used for maximum value. Hemp plants are known to have multiple uses, with the stems widely used for sustainable insulation, paper, textiles and other materials.

By 2024, Rare Earth Global expects to be the largest UK-based hemp processor, contracting up to 5,000 hectares and the team said they have already had positive discussions with some of Scotland’s major seafood producers and feed manufacturers.

“There are lots of novel feed ingredients coming into the aquaculture sector, but the hemp seed trial is about making the best use of local ingredients. Hemp is one of the fastest growing plants, using minimal water and capturing up to eight times more carbon than most trees, which makes it a highly sustainable choice for so many different products and materials,” said Suneet Shivaprasad, managing director and co-founder of Rare Earth Global. “Our aim is to ensure that every part of the plant delivers maximum impact, which is why we are focusing on aquaculture. Our studies show that protein conversion rates in salmon are much higher than for cattle or poultry, highlighting the significant potential for the sector to introduce it as a new, sustainable feed ingredient. The process could be scaled up very quickly and we could see an entirely new UK-based supply chain for fish feed emerging in the near future.”

Researchers from the Institute of Aquaculture will be conducting trials at the University of Stirling’s facilities to assess how salmon react to different varieties of the hemp plant and any impact that the ingredient has on gut bacteria and the digestive system.

There are around 100 different types of hemp plants that can be grown worldwide, from the harsh climates of the Himalayas to the warmth of the Caribbean, and a further goal of Rare Earth Global is to determine which varieties will deliver the best results in terms of both crop yield and fish health and growth.

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