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Circadian rhythms and feeding time in fishes

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Synopsis

Although several studies have described effects of meal frequency and timing of meals on growth performance and body composition of different species of fishes, the mechanisms by which such variables influence the energy partitioning processes is not known. They may interact with the natural feeding rhythm of the fish, or with various behavioural and physiological parameters that exhibit ‘circadian-like’ patterns; however, in most cases, the endogenous character of such rhythms is not clear. The time of feeding, perse, can act as a Zeitgeber and override the effect of the light/dark alternation. Fish that are fed always at the same time of day show typical pre-feeding activity. Blood levels of some nutrients and hormones also show peaks or troughs at the time of feeding, but whether these are pre-feeding or post-prandial events is not clear. These results from fish are compared with similar studies with mammals. The existence and location of an endogenous multi-oscillator system is also discussed.

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  1. Thierry Boujard

    Present address: INRA Hydrobiologie, BP3, 64310, Ascain, France

Authors and Affiliations

  1. Institute of Ichthyology, Department of Zoology, University of Guelph, Guelph, Ontario, N1G 2W1, Canada

    Thierry Boujard & John F. Leatherland

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  1. Thierry Boujard
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  2. John F. Leatherland
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Boujard, T., Leatherland, J.F. Circadian rhythms and feeding time in fishes. Environ Biol Fish 35, 109–131 (1992). https://doi.org/10.1007/BF00002186

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  • DOI: https://doi.org/10.1007/BF00002186

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