Abstract
1. 1. Nutritive and metabolic consequences of feeding rainbow trout with a single cell protein diet were studied. Experimental diet was adjusted by using yeast Hansenula anomala as the only protein source, compared to white fish meal for the controls. 2. 2. Food intake, weight increments and consequently protein efficiency ratio (PER) significantly decreased in trout fed on yeast diet. Furthermore, body nitrogen increase was lower and protein productive value (PPV) higher for the same diet, although in a nonsignificant way. 3. 3. Plasma ammonia increased significantly in the experimental animals. Plasma urea levels, although increased in about 90%, were not significantly altered. Plasma uric acid levels, unaltered in plasma and liver, suffered a three-fold increase in kidney.
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