Protective Effects of Sanyar Prebiotic on Immunity and Tissue Changes of Common Carp (Cyprinus carpio) Exposed to CuSO₄ Stress

Figure 2

Tissue section prepared from fish gill exposed to copper sulfate (H&E, bar = 25 μm, ×400). A1: control treatment fed with basal diet and arrowheads: hyperemia of secondary lamellae (a), edema and detachment of covering epithelium in secondary lamellae (b), and basal hyperplasia in secondary lamellae (c). A4: P3 treatment fed with Sanyar supplement and arrowheads: hyperemia of secondary lamellae (a), edema and detachment of covering epithelium in secondary lamellae (b), and basal hyperplasia in secondary lamellae (c).