Waste management in aquaculture affects both farmed fish welfare through water quality and wild ecosystem welfare through pollution.
Fish in aquaculture systems with poor waste management experience progressive water quality deterioration as ammonia, nitrite, and organic matter accumulate. Chronic suboptimal water quality causes physiological stress and immune suppression. Recirculating aquaculture systems that treat and recycle water maintain consistently better water quality enabling better welfare outcomes compared to flow-through systems with heavy waste loads.