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Group-living zebrafish (Danio rerio) showed altered shoaling behavior when exposed to a preferred visual environment. This suggests that preferred environments can positively impact group welfare and behavior in fish.

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Area of Science:

  • Animal behavior
  • Ethology
  • Aquatic animal welfare

Background:

  • Animals in preferred environments exhibit improved welfare indicators.
  • Group-living animals' collective behavior may be influenced by environmental enrichment.
  • Previous research often overlooks group dynamics in environmental studies.

Purpose of the Study:

  • To investigate the effect of a preferred visual environment on zebrafish group shoaling behavior.
  • To determine if environmental enrichment influences collective animal behavior.
  • To identify potential indicators of positive welfare in group-living fish.

Main Methods:

  • Confirmed zebrafish preference for a gravel visual stimulus over a plain white background.
  • Observed replicated zebrafish groups in tanks with and without the preferred visual stimulus.
  • Analyzed changes in shoaling behavior over time in relation to the visual environment.

Main Results:

  • A significant interaction between observation time and test condition was found.
  • Zebrafish groups showed gradual increases in relaxation-associated shoaling behavior in the preferred (gravel) environment.
  • The preferred visual environment induced observable changes in group behavior.

Conclusions:

  • Experiencing a preferred environment can significantly alter the group behavior of zebrafish.
  • Changes in collective behavior, like shoaling, can serve as indicators of positive welfare in fish.
  • Environmental enrichment strategies should consider group-level behavioral responses.