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

Executive summary Stakeholder feedback Introduction Defining fish welfare and Operational Welfare Indicators (OWIs) Limitations Evidence quality Method Scoring Further guidance on assessing OWIs Appendix: OWI selection

Individual-based indicators

Vertebral deformity Body condition Scale loss Skin hemorrhaging Wounds Change of coloration Snout damage Jaw deformity Eye opacity Eye injury Operculum damage Gill damage Fin damage Sea lice

Group-based indicators

Mortality Aberrant behavior Aggressive behavior Feeding behavior Swimming behavior

Environmental indicators

Stocking density Dissolved oxygen Temperature Carbon dioxide pH Turbidity Total suspended solids Ammonia Nitrite Nitrate Metals Water velocity Salinity Hydrogen sulfide

Group-based indicators

Indicators assessed at the population or pen level, reflecting group-level welfare.

Indicators

Mortality
Aberrant behavior
Aggressive behavior
Feeding behavior
Swimming behavior