Salmon aquaculture produces millions of farmed fish annually, but net pen failures regularly release large numbers of fish into the wild, creating welfare challenges for escaped fish and ecological risks for wild salmon populations.
Escaped farmed salmon face acute welfare challenges: they are genetically selected for rapid growth in controlled conditions, not wild survival. Without learned anti-predator behaviors, many are quickly caught by predators. Those that survive face food competition, unfamiliar river environments, and physiological mismatch with wild conditions. The stress of sudden environmental change - from controlled sea temperatures to variable wild conditions - causes significant physiological stress. Meanwhile, wild salmon face reduced access to resources and genetic integrity. Both the escaped fish and the wild populations pay welfare costs from these industrial failures.