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Related Experiment Video

Updated: May 25, 2025

A Fish-feeding Laboratory Bioassay to Assess the Antipredatory Activity of Secondary Metabolites from the Tissues of Marine Organisms

A Fish-feeding Laboratory Bioassay to Assess the Antipredatory Activity of Secondary Metabolites from the Tissues of Marine Organisms

Published on: January 11, 2015

Client reef fish prefer more blue-saturated cleaner wrasses Labroides dimidiatus.

Inês Cacela-Rodrigues^1,2, Sandra Trigo^1,2, Heloysa Araujo-Silva^3,4

¹CIBIO, Research Centre in Biodiversity and Genetic Resources, InBIO Associate Laboratory, Vairão 4485-661, Portugal.

The Journal of Experimental Biology

|February 27, 2025

Summary

Reef fish clients can distinguish cleaner wrasse colour saturation. Clients prefer brighter blue cleaners, suggesting colour signals individual quality and influences service selection in this marine cleaning mutualism.

Keywords:

Blue colour saturation Cleaning mutualisms Client preference Honest signals Interspecific communication

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Area of Science:

Marine biology
Animal behaviour
Colour signalling

Background:

Vivid colours in interspecific signalling aid species recognition and signal detection.
Colour can indicate individual fitness, benefiting signal receivers.
In cleaner wrasse-client mutualism, cleaner colour may signal service quality.

Purpose of the Study:

To investigate if client fish perceive differences in cleaner wrasse blue colour saturation.
To determine if clients use colour saturation to choose cleaners.

Main Methods:

Threadfin butterflyfish (clients) were exposed to video sequences of cleaner wrasse with varying blue colour saturation (minimum, control, maximum).
Client preference was measured by time spent in preference areas, frequency of facing, and entry rates near different saturation levels.

Main Results:

Clients actively preferred video sequences of more saturated cleaners over less saturated ones.
Preference was shown through increased time in areas, more frequent and longer facing durations, and higher entry rates near brighter blue cleaners.

Conclusions:

Cleaner wrasse blue colour saturation is perceived by clients.
Colour saturation likely serves as a signal of individual quality, influencing client choice in cleaner fish selection.
This visual cue aids clients in selecting cleaners that provide superior service.