In trout fingerlings with a mean weight 1.1 g and body length 4.3 cm, kept in a water stream at the velocity of 0.2 m/sec for 1-3 hours, the content of glycogen in muscles, liver and brain decreases whereas the content of unsaturated fatty acids and glucose in the blood as well as the level of lactate in muscles increase. After 5-hour swimming of the fingerlings carbohydrate metabolism and the content of unsaturated fatty acids return to the initial levels; the content of fat in the liver significantly decreases. Presumably trout fingerlings exhibit high capacity for adaptation to the given muscular activity and do not show fatigue.
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