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Related Experiment Video

Updated: May 5, 2026

Boldness, Aggression, and Shoaling Assays for Zebrafish Behavioral Syndromes

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Published on: August 29, 2016

Sex-differences and temporal consistency in stickleback fish boldness.

Andrew J King¹, Ines Fürtbauer, Diamanto Mamuneas

¹Department of Biosciences, College of Science, Swansea University, Swansea, United Kingdom ; The Structure and Motion Laboratory, The Royal Veterinary College, Hatfield, Hertfordshire, United Kingdom ; Evolutionary Ecology Group, Department of Zoology, Cambridge University, Cambridge, United Kingdom.

|December 11, 2013

Summary

Male three-spined sticklebacks exhibit bolder behaviors, exploring more and being caught sooner, reflecting sex-specific strategies. These consistent individual differences in behavior persist long-term, impacting fitness trade-offs.

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Area of Science:

Behavioral Ecology
Animal Behavior

Background:

Behavioral traits often reflect fitness trade-offs, such as exploration versus predation risk.
Males may benefit more from bold behaviors due to higher variance in reproductive success.

Purpose of the Study:

To test if male three-spined sticklebacks display higher risk-taking behaviors than females.
To investigate sex-specific behavioral strategies in relation to fitness.

Main Methods:

Observed exploration behavior in a foraging context.
Recorded the order in which fish were caught by an experimenter.
Assessed long-term behavioral consistency over nine months.

Main Results:

Males spent significantly more time exploring than females.
Males were caught sooner by experimenters, indicating higher boldness.
Behavioral consistency was observed over long periods.

Conclusions:

Male three-spined sticklebacks exhibit bolder, higher-risk behaviors compared to females.
These sex-specific strategies are linked to potential fitness benefits.
Consistent individual differences in behavior are a key factor in behavioral ecology.