Aquaponics combines fish farming with hydroponic plant production. While often promoted as sustainable, the welfare implications for the fish in these systems deserve careful attention.
Aquaponics presents a case where environmental sustainability benefits can mask inadequate fish welfare standards. Fish in aquaponics systems are subject to the same welfare requirements as any other farmed fish: water quality, stocking density, handling, disease management and humane slaughter all matter. Small-scale aquaponics operators may lack the knowledge and equipment to maintain the stable water chemistry essential for fish welfare. System failures — pump outages, ammonia spikes, disease introduction — can cause rapid mass mortality with significant suffering. The integration of plant production creates economic incentives to prioritise plant yields over fish welfare if the two conflict. Developing welfare standards specific to aquaponics and including them in certification is an important gap to address.