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Age effects on diel activity patterns of juvenile Atlantic salmon: parr are more nocturnal than young-of-the-year

Authors

  • I. Imre,

    Corresponding author
    1. Département de Sciences Biologiques, Université de Montréal, C.P. 6128, Succursale Centre-Ville, Montréal, Québec H3C 3J7 Canada
      Tel.: +1 514 343 6111 ext. 3187; fax: +1 514 343 2293; email: istvan.imre@umontreal.ca
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  • D. Boisclair

    1. Département de Sciences Biologiques, Université de Montréal, C.P. 6128, Succursale Centre-Ville, Montréal, Québec H3C 3J7 Canada
    Search for more papers by this author

Tel.: +1 514 343 6111 ext. 3187; fax: +1 514 343 2293; email: istvan.imre@umontreal.ca

Abstract

In the summer Atlantic salmon Salmo salar parr were predominantly active at night, while young-of-the-year were equally active during day and at night. These findings are consistent with the prediction that larger animals should be less willing to risk predation for a certain increase in size than smaller animals.

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