Newton, Richard W.Malcorps, WesleyRobinson, James P.W.Kok, BjörnLittle, David C.Lofstedt, Annelide Roos, BaukjeWiller, David F.2025-07-312025-07-312025-05-30Newton, R W, Malcorps, W, Robinson, J P W, Kok, B, Little, D C, Lofstedt, A, de Roos, B & Willer, D F 2025, 'Fish as Feed : Using the nutrient Fish In: Fish Out ratio (nFIFO) to enhance nutrient retention in aquaculture', Aquaculture, vol. 602, 742332. https://doi.org/10.1016/j.aquaculture.2025.7423320044-8486ORCID: /0000-0002-2750-3914/work/189192399https://hdl.handle.net/2164/25786We would like to thanks Piotr Eljasik from West Pomeranian University of Technology, Poland for constructing Fig. 1. No funding was received for the development of this article.91486275engSDG 7 - Affordable and Clean EnergySDG 12 - Responsible Consumption and ProductionSDG 14 - Life Below WaterEfficiencyEPA DHAFish oilFishmealMarine ingredientsOmega 3SH Aquaculture. Fisheries. AnglingAquatic ScienceSupplementary DataDASSHJournal article10.1016/j.aquaculture.2025.742332http://www.scopus.com/inward/record.url?scp=85219585163&partnerID=8YFLogxK602