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Related Experiment Video

Updated: Mar 24, 2026

Boldness, Aggression, and Shoaling Assays for Zebrafish Behavioral Syndromes
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Recent social conditions affect boldness repeatability in individual sticklebacks.

Jolle Wolter Jolles1, Benjamin Aaron Taylor1, Andrea Manica1

  • 1Department of Zoology, University of Cambridge, Cambridge, U.K.

Animal Behaviour
|March 8, 2016
PubMed
Summary

Recent social environments significantly impact animal personality expression. Fish housed alone showed consistent boldness, while socially housed fish displayed less predictable behavior, highlighting social carryover effects.

Keywords:
animal personalityboldnessconsistencyhousingisolationrepeatabilitythree-spined stickleback

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Area of Science:

  • Ethology
  • Animal Behavior
  • Behavioral Ecology

Background:

  • Animal personalities are common and influence/are influenced by social interactions.
  • The carryover effects of social conditions on personality, especially in isolation, are understudied.

Purpose of the Study:

  • To investigate how recent social context affects boldness and behavioral repeatability in three-spined sticklebacks.
  • To determine if solitary or social housing influences personality expression during individual assays.

Main Methods:

  • Three-spined sticklebacks (Gasterosteus aculeatus) were housed solitarily, partially solitarily, or in social groups.
  • Fish were subjected to a risk-taking task twice to assess boldness and repeatability.
  • Behavioral repeatability was compared across different social housing conditions.

Main Results:

  • Social housing significantly reduced the repeatability of boldness compared to solitary housing.
  • Solitary-housed fish exhibited higher and significant behavioral repeatability.
  • Only solitary-housed fish showed a temporal decrease in risk-taking behavior across trials.

Conclusions:

  • Recent social conditions can alter short-term behavioral repeatability and mask personality expression.
  • Social carryover effects can influence behavior even when individuals are tested alone.
  • Considering social housing is crucial for designing accurate animal personality studies.