Aquaculture

Farmed Trout Welfare and Space

Rainbow trout in aquaculture benefit from lower stocking densities that enable natural behavior expression and reduce chronic stress.

Key Facts

Rainbow trout show linear aggression hierarchies affecting subordinate welfare
Low stocking density reduces cortisol and improves immune function
Trout require current to exercise and maintain physiological fitness
Chronic overcrowding causes fin erosion and wound lesions

Welfare Considerations

Rainbow trout at high stocking densities show elevated cortisol, fin erosion, and increased wound lesions from conspecific aggression. Subordinate trout are excluded from preferred feeding positions and experience chronic stress. Current provision allows exercise that maintains cardiovascular health and muscle condition. Moderate density reductions achieve welfare improvements with acceptable production impact.

What You Can Do

Support trout from certified operations with density management
Advocate for maximum density standards in trout welfare certification
Choose certified trout from well-managed operations where available
Back research into stocking density effects on trout welfare and production