Salmon Climate Adaptation and Welfare

Climate change is forcing salmon into adaptation challenges that affect individual welfare while threatening population survival across their range.

Key Facts

Water temperatures above 21 degrees Celsius cause thermal stress in Pacific salmon
Climate projections suggest significant portions of current salmon habitat will become too warm
Earlier snowmelt shifts the timing of peak stream flows that salmon migrations depend on
Salmon showing up early to rivers that are still too warm experience prolonged thermal stress
Assisted migration and cold-water refugia programs can provide some buffer against warming

Welfare Considerations

Individual salmon welfare during climate-driven temperature stress reflects the welfare dimension of what is often framed purely as a conservation issue. Fish holding in warm water at the mouths of rivers waiting for cooler temperatures deplete fat reserves, increase disease susceptibility, and experience physiological stress that impairs spawning success if they survive to spawn at all. Welfare and conservation concerns converge on the same solutions: protecting cold water refugia, reducing non-climate stressors, and addressing the root cause through emissions reduction.

What You Can Do

Support cold water refugia protection for salmon in warming river systems
Advocate for agricultural water withdrawal reductions during low-flow hot periods
Choose salmon from cold-water fisheries with documented temperature monitoring
Reduce carbon emissions as the most important long-term action for salmon welfare and survival