Effect of acute temperature stress on histological structure of hepatopancreas of cray fish. (a: 10°C, b: 25°C, c: 30°C) on the microstructure of the hepatopancreas of P. clarkii. B, secretory cells; R, storage cells; L, hepatopancreas tubules Lumen; BM, basement membrane. Stain: Hematoxylin & Eosin. Magnification 400X.