Effect of Pymetrozine on histological structure kidney of fish. Photomicrograph of kidneys of treated fish showing a) necrosis of tubular epithelial cells (arrows) and necrosis of tubular epithelium (arrow heads), b) degeneration and necrosis of renal tubules (arrows) and necrotic cells (arrow heads), c) tubular necrosis (arrow heads) and necrosis of tubular cells (arrows) and d) inflammatory exudate (**), tubular necrosis (arrow) and degeneration and atrophied renal tubules (arrow heads).