Centre for Aquaculture Progress
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Rainbow Trout Operational Welfare Indicator (OWI) Protocol: Ongrowing, Seawater
Context
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

Individual-based indicators

Indicators assessed on individual fish through visual examination or measurement.

Indicators
  1. Vertebral deformity
  2. Body condition
  3. Scale loss
  4. Skin hemorrhaging
  5. Wounds
  6. Change of coloration
  7. Snout damage
  8. Jaw deformity
  9. Eye opacity
  10. Eye injury
  11. Operculum damage
  12. Gill damage
  13. Fin damage
  14. Sea lice