First validation of Halophyte Protein Concentrate as a novel ingredient for salmon feeds

This project will deliver first-time functional validation of a halophyte-derived protein concentrate (HPC) developed by Seawater Solutions as a novel, sustainable protein source for salmon aquafeeds. The HPC is being produced through a UK-based biorefinery process optimised to enhance protein content and bioavailability from halophytes cultivated on saline and degraded lands. While halophytes are increasingly recognised for their potential in sustainable food systems, their application in aquafeeds remains largely untested. This project will be the first to assess the nutritional quality, digestibility, and acceptability of this biomass in Atlantic salmon diets.

The University of Stirling will lead full biochemical characterisation of the HPC, including proximate composition, amino acid and mineral profile, and anti-nutritional factor (ANF) screening. As a first validation step, the HPC will be assessed using the SalmoSim in vitro digestion model (University of Glasgow) to estimate protein digestibility, de-risking ingredient selection and diet formulation prior to live fish exposure. Two short in vivo trials will follow: (1) a palatability trial to assess feed intake, and (2) a digestibility trial using yttrium oxide as an inert marker to determine apparent digestibility coefficients for protein, amino acids, and energy.

We are targeting NAPIC’s strategic challenges i.e. “Unlocking Nature’s Potential” and “Sustainable Bioprocessing”. We will be applying for the PoC2 stream. Outcomes will inform future decisions on inclusion levels, scaling, and regulatory engagement, in hopes to position halophytes as a viable alternative protein source within UK aquafeed systems.