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Related Experiment Video

Updated: Apr 28, 2026

Boldness, Aggression, and Shoaling Assays for Zebrafish Behavioral Syndromes

Boldness, Aggression, and Shoaling Assays for Zebrafish Behavioral Syndromes

Published on: August 29, 2016

Fish movement behaviour: variability within and between groups.

S D Fitzsimmons¹, K Warburton

¹Department of Zoology, University of Queensland, St. Lucia, Australia.

Behavioural Processes

|June 14, 2014

Summary

Fish school size impacts movement. Larger mullet (Mugil cephalus) schools exhibit slower speeds and fewer turns, demonstrating coordinated behavior that masks individual variation for uniformity.

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Behavioral Tracking and Neuromast Imaging of Mexican Cavefish

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Published on: April 6, 2019

Area of Science:

Animal behavior
Ichthyology
Collective animal behavior

Background:

Mullet (Mugil cephalus) are obligate schooling fish.
Understanding schooling behavior is key to marine ecology.
Individual variation exists within fish groups.

Purpose of the Study:

To investigate the relationship between group size and movement behavior in mullet.
To determine how individual variation is affected by school size.
To analyze the coordination within mullet schools.

Main Methods:

Recording movement behavior of individual mullet within small groups.
Analyzing mean speeds and mean turning frequencies.
Quantifying coordination and individual variation in relation to group size.

Main Results:

Mean speeds and turning frequencies significantly decreased as group size increased.
Individual variation between groups was significant.
Movement within groups was highly coordinated, masking individual differences in larger schools.

Conclusions:

School size is a critical factor influencing the movement patterns of mullet.
Behavioral convergence in larger schools leads to uniformity by suppressing individual variation.
Monitoring of companions plays a key role in mediating collective behavior in fish aggregations.