Pike perch (zander) is an important aquaculture species in Central and Eastern Europe. As an active predatory fish, their welfare requirements in intensive systems differ from omnivorous species.
Pike perch welfare in aquaculture reflects the challenges of farming obligate carnivores with specialized behavioral needs. Their crepuscular nature means that artificial lighting regimes common in RAS facilities conflict with their natural activity patterns, potentially causing chronic disruption to normal behavior. Weaning from live prey to pelleted diets causes significant acute stress and initial weight loss. Cannibalism is a welfare concern during early life stages when size heterogeneity develops — frequent grading reduces cannibalism but each grading event causes acute handling stress. Their active, predatory nature means behavioral restriction in high-density systems causes frustration that cannot be easily addressed through standard enrichment. RAS systems for pike perch that accommodate light preferences and provide grading management represent the current welfare frontier for this species.