Wild Atlantic salmon face dramatic population declines driven by habitat degradation, barriers to migration, and climate change. Habitat restoration offers direct welfare benefits by improving conditions for remaining populations.
Salmon habitat restoration has direct welfare implications for wild fish populations. Salmon attempting to migrate past barriers exhaust themselves, injure themselves on fish passes poorly designed for passage, and in some cases die before reaching spawning grounds. High water temperatures during drought conditions cause physiological stress, immune suppression, and disease. Successful habitat restoration reduces these welfare burdens: dam removal eliminates barrier-related exhaustion and injury; riparian shading maintains cooler water temperatures; gravel cleaning improves spawning habitat quality and egg survival. For a species experiencing population collapse, habitat restoration is simultaneously a conservation and welfare priority.