Wild Salmon Pacific Decline and Ecosystem Welfare

Collapsing Pacific salmon runs represent both a conservation crisis and a welfare concern for millions of individual fish and the communities of wildlife that depend on them.

Key Facts

Pacific salmon populations have declined by 90 percent or more in some regions since the 1800s
Dams blocking spawning migration are a leading cause of population collapse
Salmon provide marine-derived nutrients that sustain entire riparian ecosystems
Hatchery supplementation can mask but not replace the ecological function of wild populations
Salmon experience extreme physiological changes and challenges during spawning migrations

Welfare Considerations

The welfare dimensions of Pacific salmon decline extend in multiple directions. Individual salmon face exhausting migration journeys only to find blocked rivers or degraded spawning grounds. Those who spawn in degraded tributaries may find water too warm for egg development. The collapse of salmon runs also affects the predators and scavengers — bears, eagles, wolves, orcas — that depend on them, causing nutritional stress in these populations. Dam removal has been the most effective tool for restoring salmon runs, with dramatic recoveries following the largest dam removals in US history providing proof of concept.

What You Can Do

Support organisations campaigning for dam removal and fish passage on salmon rivers
Reduce consumption of farmed salmon where it competes with wild salmon recovery efforts
Advocate for water temperature and flow standards that protect spawning salmon
Learn about salmon ecology and share the connection between salmon and broader ecosystem health