Forskning ved Københavns Universitet - Københavns Universitet


Egg cortisol exposure enhances fearfulness in larvae and juvenile rainbow trout

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  • Violaine Colson
  • Claudiane Valotaire
  • Benjamin Geffroy
  • Pia Kiilerich

We investigated the effects of an early boost of cortisol exposure in rainbow trout (Oncorhynchus mykiss) eggs during fertilisation on subsequent behavioural responses when exposed to a sudden stimulus in larvae and juveniles. At 55 d post-fertilisation (dpf), treatment had no effect on high accelerations occurring after a sudden event. At 146 dpf, these high accelerations were more frequent in cortisol-treated fish than in controls. At 146 dpf also, swimming activity was increased in cortisol-treated fish both before and after the sudden stimulus. This study underlines the important behavioural modifications in both larvae and juveniles, linked to a change in the surrounding environment of the embryo. Indeed, fish exposed to cortisol as eggs showed a higher level of fearfulness later in life. Our findings are of major interest for stress management in an aquaculture context and also allow for a better understanding of the long-lasting effects of a permanent and/or acute stress - mediated by cortisol - that could be encountered by females, affecting population's life history trajectory.

Udgave nummer12
Sider (fra-til)1191-1201
Antal sider11
StatusUdgivet - 2015

ID: 153451771