Abstract

1. 1. The effect of high levels of dietary salt up to 12% Nad on kidney function in freshwater rainbow trout was investigated. 2. 2. Renal response to dietary Nad load includes increases in urinary flow rate and glomerular filtration rate, together with a slight reduction in ionic reabsorption capacity. 3. 3. The renal salt excretion rate, which was doubled to about 100 μM/kg/hr, in fish fed the high salt diet, is not entirely a consequence of a reduction in tubular ionic reabsorption but also of increased glomerular filtration. 4. 4. The role of the endocrine system in control of renal salt excretion is discussed.

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