Cortisol and glucose responses in juvenile brown trout subjected to a fluctuating flow regime in an artificial stream

  • Flodmark L
  • Urke H
  • Halleraker J
 et al. 
  • 59

    Readers

    Mendeley users who have this article in their library.
  • 53

    Citations

    Citations of this article.

Abstract

In an artificial stream channel, wild 1 year old brown trout Salmo trutta were exposed to fluctuations in flow and water level to simulate hydro-peaking conditions downstream of a hydropower installation. Blood plasma cortisol concentrations reached a maximum of 59·4±35·3 ng ml -1 (mean±95% CL) 2 h after the end of down-ramping. Return to the pre-exposure cortisol level was achieved within 6 h. When subjected to daily cyclical fluctuations over 7 days, plasma cortisol levels were significantly elevated (61·3±26·8 ng ml -1) on the first day compared to undisturbed fish (4·9±3·7 ng ml -1). On the fourth and seventh day, no elevation in plasma cortisol above control levels was observed. No changes in blood glucose that could be attributed to the stressor were found. There was no correlation between plasma cortisol and blood glucose levels. The short-lived cortisol response to daily fluctuations indicates a rapid habituation to this stressor. © 2002 The Fisheries Society of the British Isles.

Author-supplied keywords

  • Hydropower
  • Parr
  • Salmo trutta
  • Stress
  • Water level

Get free article suggestions today

Mendeley saves you time finding and organizing research

Sign up here
Already have an account ?Sign in

Find this document

Authors

Cite this document

Choose a citation style from the tabs below

Save time finding and organizing research with Mendeley

Sign up for free