Rainbow Trout Operational Welfare Indicator (OWI) Protocol: Ongrowing, Seawater

The Centre for Aquaculture Progress would like to extend its sincere thanks to all those who contributed their time, expertise, and feedback to the development of this protocol.

In particular, we would like to thank Marco Cerqueira (CCMAR, University of Algarve) for his close collaboration throughout the development of this document. We would also like to thank Jonatan Nilsson and Angelico Madaro (Institute of Marine Research) for their detailed review and extensive contributions to this protocol.

We would also like to thank the following individuals for their feedback to this protocol: Sean Black (RSPCA), Jeroen Brijs (University of Innsbruck), Meredith Burke (University of Stirling), Mauro Chivite Alcaide (University of Vigo), David Dietz (Best Aquaculture Practices / Global Seafood Alliance), Steffan Edward (Aquatic Life Institute), Tessa Gonzales (Aquatic Life Institute), Marianne Green (Aquaculture Stewardship Council), Albin Gräns (Swedish University of Agricultural Sciences), Stefan Johnigk (Aquaculture Welfare Standards Initiative), Haven King-Nobles (Fish Welfare Initiative), Brianne Lyall (University of Tasmania), Kine Rivers Marhaug (Eyvi), Julia Mühlherr (Naturland), Mario Passoni (Friend of the Sea), Murilo Quintiliano (FAI Farms), Ana Roque (IRTA), Jonathan Schleyken (Naturland), Emanuele Vervelacis, Douglas Waley, and Valeska Weymann (GlobalG.A.P.).

Suggested citation: Centre for Aquaculture Progress. (2026). Rainbow Trout Operational Welfare Indicator (OWI) Protocol: Ongrowing, Seawater (Version 1.0). https://doi.org/10.5281/zenodo.21869741 Also available at: https://hub.centreforaquacultureprogress.org/owi/trr/ong-sw/1.0/