Pikeperch is an emerging aquaculture species in European RAS systems with specific welfare needs around light, density, and its predatory feeding behaviour.
Pikeperch welfare in RAS systems depends critically on matching their natural crepuscular behaviour. Standard aquaculture lighting cycles inappropriate for this species impair feeding and cause chronic stress. Territorial aggression at high stocking densities causes fin damage, eye injuries, and growth hierarchy formation reducing welfare of subordinate fish. Their sensitive lateral line system means water quality management in RAS must ensure appropriate flow velocities and absence of vibration. Welfare-optimised RAS design incorporating species-appropriate lighting and density significantly improves outcomes.