Red tilapia are commercially important farmed fish in tropical Asia and Africa, with welfare considerations around crowding, disease, and water quality management in intensive systems.
Red tilapia in intensive systems face welfare challenges from high stocking densities that suppress immune function and increase disease transmission. Streptococcal disease causing meningitis produces severe neurological signs including spiral swimming, exophthalmia, and loss of righting reflex, causing significant suffering in affected fish. Crowding stress from high density is chronic, causing sustained elevation of stress hormones that compromise immune function and growth. Water quality management failures causing oxygen depletion events kill large numbers of fish rapidly by suffocation. Live harvest practices involve crowding fish as pond water is reduced, causing extreme stress.