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The diel partitioning of juvenile brown trout Salmotrutta foraging behaviour is controlled by a number offactors including predation risk, competition, temperature and foodavailability. The present study uses PIT-tagging and visual observationto asses the use of shelter and foraging behaviour ofDanishwild juvenile brown trout (13.5–15.6 cm). The experiment was  conductedin a fluvarium and the fish were fed to satiation. It was hypothesisedthat food satiation would promote nocturnal foraging and increasedaytime shelter use. Our results showed a significant differencein diel shelter use between day and night with a significant increasein shelter use during daytime conditions. Visual observations showeda significant preference for nocturnal feeding. Together with thesignificantly reduced shelter use during the night, our resultssupport the hypothesis that young stream living trout only feedduring the day to the extent needed to sustain growth

Diel foraging and shelter use of large juvenile brown trout (Salmo trutta) under food satiation