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Testing a Claim about Mean: Known Population SD01:11

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Related Experiment Video

Updated: Feb 26, 2026

Behavioral Approaches to Studying Innate Stress in Zebrafish
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Cortisol elevation post-hatch affects behavioural performance in zebrafish larvae.

Carol Best1, Mathilakath M Vijayan1

  • 1Department of Biological Sciences, University of Calgary, 2500 University Drive NW, Calgary, Alberta T2N 1N4, Canada.

General and Comparative Endocrinology
|July 18, 2017
PubMed
Summary
This summary is machine-generated.

Elevated cortisol post-hatch increases locomotor activity in zebrafish larvae. This behavioral change is not mediated by glucocorticoid receptor (GR) activation, suggesting mineralocorticoid receptor (MR) involvement.

Keywords:
CortisolDevelopmentEarly-life stressGlucocorticoid receptorLarval behaviourMineralocorticoid receptorZebrafish

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Automated High-throughput Behavioral Analyses in Zebrafish Larvae
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Area of Science:

  • Endocrinology
  • Neuroscience
  • Developmental Biology

Background:

  • Maternal cortisol is crucial for developing the zebrafish stress axis, with steroid production starting post-hatch.
  • The impact of elevated cortisol during early stress axis activation on larval performance remains largely unknown.

Purpose of the Study:

  • To investigate the effects of elevated post-hatch cortisol on zebrafish larval behavior.
  • To determine if glucocorticoid receptor (GR) activation mediates cortisol's impact on behavior.

Main Methods:

  • Zebrafish larvae (3 days post-fertilization) were exposed to waterborne cortisol for 24 hours.
  • Glucocorticoid receptor (GR) antagonist RU-486 was used to assess GR mediation.
  • Behavioral responses, including activity in light/dark cycles and thigmotaxis, were measured.

Main Results:

  • Cortisol exposure significantly increased larval locomotor activity regardless of light conditions.
  • Thigmotaxis and GR/mineralocorticoid receptor (MR) transcript levels were unaffected by cortisol exposure.
  • RU-486 co-treatment confirmed GR signaling but did not alter cortisol's effect on locomotor activity.

Conclusions:

  • Post-hatch cortisol stress axis activation enhances locomotor activity in zebrafish larvae.
  • GR signaling does not appear to mediate this cortisol-induced behavioral change.
  • Mineralocorticoid receptor (MR) signaling is proposed as a potential mediator of increased locomotor activity.