Channel catfish are the primary farmed fish species in the United States, produced in large outdoor pond systems. Welfare challenges include overcrowding, oxygen depletion, disease outbreaks, and poor slaughter practices.
Catfish welfare in intensive pond aquaculture is affected by several chronic and acute stressors. High stocking densities in large ponds create competition for resources and elevated stress. Seasonal oxygen depletion events — common in summer when warm water holds less dissolved oxygen and algal blooms consume it — cause acute distress and mass mortality, with surviving fish showing physiological signs of severe stress. Disease outbreaks including columnaris and enteric septicaemia cause significant morbidity and mortality. Crowding during harvest using seines causes extreme acute stress. Slaughter welfare is inconsistent: some facilities use effective electrical stunning while others rely on slow methods that allow prolonged conscious suffering. Pangasius farming in Southeast Asia has faced additional welfare and environmental scrutiny regarding stocking densities and effluent management.