In partnership with Lancaster, Aberdeen, and Cambridge universities, scientists at the University of Stirling’s Institute of Aquaculture have developed a new method to measure how effectively farmed fish retain key nutrients from their feed.
The research introduces a refined metric, Nutrient Fish-In Fish-Out (nFIFO), which builds on the traditional FIFO model by considering nutrient retention and the use of fishery by-products. This approach aims to improve feed efficiency, reduce waste, and decrease reliance on wild fish.
Findings from the study, published in Aquaculture, show that farmed salmon currently retain only 38% of the omega-3 fatty acids provided in their feed. Researchers suggest using fishery by-products instead of whole fish in aquafeeds could significantly enhance nutrient retention.
To support industry adoption, the team has developed an online calculation tool, available through Blue Food Performance’s sustainability indicators, to help fish farmers and policymakers optimise feed strategies and reduce environmental impact.