Wild orca populations face multiple welfare threats from prey depletion, noise pollution, toxic contamination, and entanglement that cause individual suffering at population scale.
Wild orca welfare is inseparable from the environmental health of their ecosystems. Nutritionally stressed Southern Resident orcas show the physical signs of hunger — distinct postmortem fat stores — as chronic prey depletion reduces available Chinook salmon to levels that cannot sustain adequate body condition. Noise pollution that masks echolocation forces these specialist feeders to spend more energy hunting with reduced success rates. PCB contamination suppresses the immune and reproductive systems of generations of orcas from legacy industrial pollution that continues to cycle through marine food webs. The welfare improvements available to wild orcas require systemic environmental action: salmon recovery, vessel speed and distance regulations, and PCB contamination remediation.