Channel catfish are the most farmed freshwater fish in the US, and water quality management is the primary determinant of their welfare in pond systems.
Dissolved oxygen crashes cause catfish to experience hypoxic stress, surfacing and gulping air before losing consciousness and dying in severe cases. Chronic low oxygen impairs immune function and increases disease susceptibility over time. Pond management practices that prevent oxygen fluctuation through proper stocking density, feeding management, and aeration significantly reduce the frequency and severity of welfare emergencies.