Effect of high concentration of onion slurry via diet and bath on histological structure of the kidney of Clarias garieoinus. A shows degeneration and necrosis of tubular (arrow) and glomerular epithelial cells (arrow head). B shows degeneration and necrosis of tubular (white arrow) and glomerular (red arrow) epithelial cells with haemosiderosis (white arrow heads); there is proteinecious material in the renal tubules (red arrow head). C shows kidney appearing apparently normal (H & E stain). Magnification: 400 X.