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

John Conallin

    Research output: Contribution to journalJournal articleResearchpeer-review

    Abstract

    The diel partitioning of juvenile brown trout Salmo trutta foraging behaviour is controlled by a number of factors including predation risk, competition, temperature and food availability. The present study uses PIT-tagging and visual observation to asses the use of shelter and foraging behaviour of Danish wild juvenile brown trout (13.5-15.6 cm). The experiment was conducted in a fluvarium and the fish were fed to satiation. It was hypothesised that food satiation would promote nocturnal foraging and increase daytime shelter use. Our results showed a significant difference in diel shelter use between day and night with a significant increase in shelter use during daytime conditions. Visual observations showed a significant preference for nocturnal feeding. Together with the significantly reduced shelter use during the night, our results support the hypothesis that young stream living trout only feed during the day to the extent needed to sustain growth.
    Original languageEnglish
    JournalKnowledge and Management of Aquatic Ecosystems
    Issue number404
    ISSN1961-9502
    DOIs
    Publication statusPublished - 2012

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