A comparison of methodologies to test aggression in zebrafish

Area of Science:

• Ethology
• Comparative Psychology
• Animal Behavior

Background:

• Aggression is a key behavioral construct in zebrafish (Danio rerio), crucial for understanding social interactions.
• Measuring zebrafish aggression is complex, with various methodologies lacking formal comparative analysis.

Purpose of the Study:

• To formally compare the efficacy of six common assays in quantifying zebrafish aggression.
• To identify differences in behavioral responses elicited by various stimuli used in aggression assays.

Main Methods:

• Observed 19 individual zebrafish (Danio rerio) across six distinct aggression assays.
• Quantified behaviors including bites, lateral displays, charges, darts, and proximity to stimulus.
• Assays included inclined mirror, two flat mirror variations, live conspecific, clay model, and video recording.

Main Results:

• High repeatability of aggressive behaviors across assays suggests their value for personality assessment.
• Significant differences in behavioral outputs were observed between assays.
• Flat mirror and live conspecific stimuli elicited more attempted bites compared to other methods.
• The inclined mirror assay provoked a higher frequency of darts.

Conclusions:

• Zebrafish aggression assays demonstrate high repeatability but vary in their elicited responses.
• The choice of stimulus (e.g., flat mirror, live conspecific, inclined mirror) significantly impacts specific aggressive behaviors measured.
• Researchers should carefully select aggression assay stimuli based on their specific research objectives and the behaviors of interest.