Abstract
1. 1. The total waste nitrogen excreted by rainbow trout at 12–14°C declined rapidly during the first 6 days of starvation. It was less variable during the sixth to fourteenth day of starvation and averaged 136 mg N/kg per day. 2. 2. Only about 3 per cent of the total waste nitrogen was excreted via the kidney. 3. 3. The amount of ammonia-N excreted amounted to about 60 per cent of the total nitrogen excreted and followed a similar excretion pattern with starvation. 4. 4. Values for osmotic concentration and daily urine volume are given along with values for concentration of some inorganic ions in both blood and urine. From these data renal clearances for these ions were calculated along with urine plasma concentration ratios.
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