Recirculating aquaculture systems circulate and filter water on land, offering potential welfare advantages through controlled environments but also creating specific welfare challenges from water quality management and stocking density.
Recirculating aquaculture systems offer welfare advantages through controlled water quality and protection from predators and parasites, but also create specific welfare risks from the consequences of system failures in closed environments. High stocking densities justified by the controlled environment create crowding stress even when water quality is maintained. The dependence on continuous mechanical and biological filtration means that system failures rapidly create severe welfare crises as water quality deteriorates without dilution. Welfare-focused RAS design requires conservative stocking densities, redundant life support systems, and continuous welfare monitoring.