The early life stages of farmed Atlantic salmon in freshwater hatcheries and smolt production facilities present distinct welfare challenges that shape the health and wellbeing of fish throughout their lives.
Early life welfare in salmon hatcheries is critically important because welfare insults during sensitive developmental periods have lasting consequences. Salmon that experience chronic stress, poor water quality, or high aggression during early freshwater stages develop altered stress response systems that affect their welfare in sea cages throughout the production cycle. Welfare-conscious hatchery management recognises this developmental programming effect and invests in optimal conditions - clean water, appropriate densities, careful handling - not just for immediate welfare but as investment in lifelong fish health. The smoltification period is particularly sensitive, requiring careful management of temperature, photoperiod and density to support the physiological transition.