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Updated: Mar 3, 2026

Boldness, Aggression, and Shoaling Assays for Zebrafish Behavioral Syndromes
Published on: August 29, 2016
A predation cost to bold fish in the wild
Kaj Hulthén1, Ben B Chapman2, P Anders Nilsson3,4
1Department of Biology - Aquatic Ecology, Ecology Building, Lund University, SE-223 62, Lund, Sweden. kaj.hulthen@biol.lu.se.
Boldness in prey fish increases their risk of predation by cormorants. This study provides direct evidence of behavioral differences influencing survival in the wild, crucial for understanding behavioral diversity.
Area of Science:
- Ecology and Evolutionary Biology
- Animal Behavior
Background:
- Individual differences in prey behavior, such as boldness, are common in nature.
- Predator-mediated selection is key to understanding behavioral diversity.
- Linking predation events to specific behaviors in the wild is challenging.
Purpose of the Study:
- To investigate the relationship between individual boldness and predation risk in wild fish populations.
- To provide direct evidence of behavioral type-dependent predation vulnerability.
Main Methods:
- Hundreds of roach (Rutilus rutilus) were behaviorally assayed and tagged.
- Tagged fish were released into their natural lake habitat, exposing them to avian predators (cormorants, Phalacrocorax carbo).
- Predation events were identified by scanning cormorant roosting sites for regurgitated tags.
Main Results:
- Bolder fish exhibited higher susceptibility to cormorant predation.
- Shy, risk-averse individuals had a lower predation rate.
- Direct evidence linking boldness to increased predation vulnerability in a wild setting was established.
Conclusions:
- Boldness in prey incurs a significant predation cost in the wild.
- Predation risk associated with boldness is critical for maintaining behavioral diversity.
- This study offers direct empirical support for theoretical predictions on predator-prey interactions and behavior evolution.
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