Hatchery programs release billions of salmon annually to supplement wild populations, but the welfare of hatchery fish — and their interactions with wild counterparts — raises underexplored questions.
Billions of hatchery salmon experience welfare conditions that would be considered unacceptable if applied to other farmed vertebrates. Extreme density, chronic stress, and abnormal behavior patterns are endemic in production hatcheries. Fish welfare science has advanced sufficiently to recognize that hatchery conditions cause genuine suffering at scale. The justification — population supplementation — is legitimate, but does not eliminate the welfare obligation to fish in those systems. Welfare-conscious hatchery management is possible and compatible with conservation goals, but requires intentional redesign of rearing protocols.