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The images include (a) control group, (b-d) 2000 μg/L, 4000 μg/L, and 6000 μg/L. The gills of the control group showed normal histopathology, whereas the other treated groups showed lamellar disorganization (black arrow), fusion of primary lamellae (red arrow), lamellar aneurysm (yellow arrow), hyperplasia of epithelial cells (white arrow), and bone cell deformities (orange arrow).
