Regulation of lipid metabolism may be complex. Thereafter, inflation by secretion at gas gland, resorption at oval window.
Gas is usually oxygen.
Eel rete 100 m.sq. area for diffusion. Limitation of physoclists Powerful constraint on upward movement. Swim bladder will rupture if ambient pressure reduced too rapidly. Thereafter, inflation by secretion at gas gland, resorption at oval window. Gas is usually oxygen.