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Behavioral Approaches to Studying Innate Stress in Zebrafish
Published on: May 1, 2019
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Differences in inhibitory avoidance, cortisol and brain gene expression in TL and AB zebrafish
M Gorissen1, R Manuel1, T N M Pelgrim1
1Department of Animal Physiology, Institute for Water and Wetland Research, Radboud University, Nijmegen, the Netherlands.
Genes, Brain, and Behavior
|April 25, 2015
Summary
Tupfel Long-Fin (TL) zebrafish demonstrated effective inhibitory avoidance learning, unlike AB strain fish. AB fish exhibited higher stress hormones and gene expression, suggesting genetic predispositions to stress-related disorders in zebrafish.
Area of Science:
- Neuroscience
- Behavioral Genetics
- Zebrafish Models
Background:
- Zebrafish models are increasingly used to study complex behaviors and stress responses.
- Genetic variations between zebrafish strains, such as TL and AB, can lead to distinct behavioral and physiological profiles.
- Understanding these strain differences is crucial for accurate interpretation of experimental results.
Purpose of the Study:
- To compare the inhibitory avoidance learning capabilities of Tupfel Long-Fin (TL) and AB zebrafish strains.
- To investigate differences in stress hormone levels (cortisol) and gene expression related to stress, anxiety, and fear between the two strains.
- To determine if strain-specific responses to an inhibitory avoidance task correlate with genetic predispositions to stress-related disorders.
Main Methods:
- An established 3-day inhibitory avoidance paradigm involving a white and black compartment with mild electric shock was employed.
- Behavioral performance, including avoidance learning and spatial behavior, was assessed across three days.
- Whole-body cortisol levels and telencephalic gene expression (stress, anxiety, fear markers) were measured pre- and post-task.
Main Results:
- TL zebrafish exhibited rapid inhibitory avoidance learning and increased avoidance behavior over the three days.
- AB zebrafish demonstrated a lack of inhibitory avoidance learning.
- AB fish displayed higher basal cortisol levels and elevated expression of stress-related genes compared to TL fish.
- TL fish showed learning-related changes in cortisol and gene expression post-task, which were absent in AB fish.
Conclusions:
- Significant behavioral and physiological differences exist between TL and AB zebrafish strains in the context of inhibitory avoidance learning and stress response.
- AB zebrafish present with higher basal stress indicators and impaired learning, suggesting a potential genetic susceptibility to stress-related conditions.
- This study highlights the utility of comparing distinct zebrafish strains to identify genetic factors influencing stress and anxiety disorders.
