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Parental stress-coping styles affect the behaviour of rainbow trout Oncorhynchus mykiss at early developmental stages

Authors

  • E. Höglund,

    Corresponding author
    1. * Department of Marine Ecology and Aquaculture, Danish Institute for Fisheries Research, Technical University of Denmark, North Sea Center, P. O. Box 101, DK-9850 Hirtshals, Denmark, Department of Animal and Aquacultural Sciences, Norwegian University of Life Sciences, P. O. Box 5003 Ås, Norway and § NERC Centre for Ecology and Hydrology Lancaster, Lancaster Environment Centre, Bailrigg, Lancaster LA1 4AP, U.K.
      †Tel.: +45 3396 3249; fax: +45 3396 3260; email: erh@difres.dk
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  • H.-M. Gjøen,

    1. * Department of Marine Ecology and Aquaculture, Danish Institute for Fisheries Research, Technical University of Denmark, North Sea Center, P. O. Box 101, DK-9850 Hirtshals, Denmark, Department of Animal and Aquacultural Sciences, Norwegian University of Life Sciences, P. O. Box 5003 Ås, Norway and § NERC Centre for Ecology and Hydrology Lancaster, Lancaster Environment Centre, Bailrigg, Lancaster LA1 4AP, U.K.
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  • T. G. Pottinger,

    1. * Department of Marine Ecology and Aquaculture, Danish Institute for Fisheries Research, Technical University of Denmark, North Sea Center, P. O. Box 101, DK-9850 Hirtshals, Denmark, Department of Animal and Aquacultural Sciences, Norwegian University of Life Sciences, P. O. Box 5003 Ås, Norway and § NERC Centre for Ecology and Hydrology Lancaster, Lancaster Environment Centre, Bailrigg, Lancaster LA1 4AP, U.K.
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  • Ø ØVerli

    1. * Department of Marine Ecology and Aquaculture, Danish Institute for Fisheries Research, Technical University of Denmark, North Sea Center, P. O. Box 101, DK-9850 Hirtshals, Denmark, Department of Animal and Aquacultural Sciences, Norwegian University of Life Sciences, P. O. Box 5003 Ås, Norway and § NERC Centre for Ecology and Hydrology Lancaster, Lancaster Environment Centre, Bailrigg, Lancaster LA1 4AP, U.K.
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†Tel.: +45 3396 3249; fax: +45 3396 3260; email: erh@difres.dk

Abstract

This work examined behavioural responses in yolk-sac rainbow trout Oncorhynchus mykiss larvae originating from strains selected for high (HR) or low (LR) plasma cortisol response to a standardized stressor. The results showed that yolk-sac larvae originating from the HR strain were more sensitive to environmental stressors, in that they showed a shorter reaction time to low oxygen levels. Previous studies on adult and juvenile individuals from these strains demonstrated a number of correlated physiological and behavioural differences. In yolk-sac larvae, growth and development depended mainly on internal factors, which suggest that at least some aspects of stress-coping styles are inherent to the individual, before factors such as social experience or variable access to food resources could modify behavioural strategy.

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