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Abstract
The effects of diets with differents protein and fat levels on gluconeogenesis in rainbow trout (Salmo gairdneri) were studied. The insertion of short fasting periods was also considered. Reduction of protein level of the diet was accomplished to a reduced rate of gluconeogenesis as the lower activíties of PEPCK and FDP-ase have pointed out. During feeding periods the activity of liver transaminases studied reflects the intensity of protein anabolism, whereas during fasting periods, these activities are determined by the aminoac1ds catabolism rate.
Gluconeogenesis from lactate seems to be a process of less importance, at least in muscular resting conditions.
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