Effect of prolonged feed restriction on size variation, feed consumption, body composition, growth and smolting of brown trout, Salmo trutta
1998
Pirhonen, J. | Forsman, L.
1 + brown trout (Salmo trutta) were reared under three different feeding frequencies from the end of May until the beginning of November. Those groups fed only twice a week for 4 h (TW) or once a day for 30 min (OD) were significantly smaller than the control fish (fed 4 h in the morning and 4 h in the evening) at the end of the feed restriction period. All the groups were fed in excess. After 2 months an increase in growth rate was observed in the TW groups. Decreased feeding frequency did not affect the size variation within a group, even though the feed was divided more evenly between the individuals in feed restricted than in control groups. At the beginning of November all the groups were switched to 4 h day(-1) ad libitum feeding. That switch did not cause any compensatory growth during the winter. The decrease of the growth opportunity between the end of May and the beginning of November did not markedly affect smolting behaviour or hypo-osmoregulatory capacity during the following spring.
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