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Related Experiment Video

Updated: Feb 1, 2026

Quantifying Corticolous Arthropods Using Sticky Traps

Quantifying Corticolous Arthropods Using Sticky Traps

Published on: January 19, 2020

Do arthropods feel anxious during molts?

Julien Bacqué-Cazenave¹, Marion Berthomieu¹, Daniel Cattaert¹

¹Department of Life and Health Science, Université de Bordeaux. CNRS, UMR5287, INCIA (Institut des Neurosciences Cognitives et Intégratives d'Aquitaine), 146 Rue Léo Saignat, 33076 Bordeaux, France.

The Journal of Experimental Biology

|December 12, 2018

Summary

Arthropod molting, driven by ecdysteroids, causes stress and anxiety-like behavior (ALB). This study shows crayfish exhibit ALB around molting, confirming hormonal control of stress responses in arthropods.

Keywords:

Anxiety Crayfish Ecdysteroids Plus-maze Stress

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Area of Science:

Animal Behavior
Endocrinology
Arthropod Biology

Background:

Molting in arthropods is a physiologically demanding process.
Ecdysteroids are key hormones regulating arthropod molting.
Previous research linked stress to anxiety-like behavior (ALB) in crayfish.

Purpose of the Study:

To investigate anxiety-like behavior (ALB) in crayfish during different molt cycle stages.
To determine the role of ecdysteroids in mediating stress and ALB during molting.
To explore potential anxiolytic interventions for ecdysteroid-induced ALB.

Main Methods:

Analysis of spontaneous exploratory behavior in a dark/light plus-maze (DLPM).
Observation of crayfish at various stages of the molt cycle.
Administration of ecdysteroids and benzodiazepines via injection.

Main Results:

Crayfish exhibited ALB (light aversion) primarily before and after molting, not during inter-molt.
Ecdysteroid injection induced ALB in inter-molt crayfish after a 4-day delay.
Anxiolytic benzodiazepine administration suppressed ecdysteroid-induced ALB.

Conclusions:

Molting and its hormonal regulation by ecdysteroids induce internal stress and anxiety-like behavior in crayfish.
These findings suggest a conserved mechanism of stress and anxiety in arthropods.
Ecdysteroids play a significant role in the neuroendocrine control of stress responses during molting.