How hatchery supplementation of wild salmon runs raises ethical and ecological questions about welfare and conservation priorities.
Hatchery supplementation of wild salmon populations represents a welfare intervention with complex trade-offs. On one hand, hatcheries can produce welfare-compromised fish through crowding and artificial conditions. On the other, without hatchery supplementation some depleted runs would collapse entirely, eliminating the population. The welfare of hatchery fish during the rearing phase depends on management choices that affect crowding, disease rates, and stress — all improvable through welfare-focused hatchery design. The longer-term question — whether hatcheries serve conservation or merely permit continued exploitation without genuine recovery — is a policy debate with significant welfare implications for wild fish populations if they get the answer wrong.