Abstract
1. 1. Renal function was studied in Varanus gouldii under control, water-loaded and salt-loaded conditions and the effects of exogenous arginine vasotocin (AVT) were also noted. 2. 2. Glomerular filtration rate (GFR) in V. gouldii was similar to that of other reptiles. GFR increased substantially with water-loading but decreased when AVT was injected. Salt-loading did not affect GFR significantly. 3. 3. There were no pronounced tubular effects with water-loading or AVT administration but there was increased resorption of water with salt-loading. 4. 4. A constant percentage of filtered sodium was resorbed in all treatments. 5. 5. The kidneys exhibited a limited degree of control over water and electrolyte excretion and this is discussed in relation to the functions of the cloaca and nasal salt glands.
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