Live predators, robots, and computer-animated images elicit differential avoidance responses in zebrafish

Area of Science:

• Neuroscience
• Ethology
• Animal Behavior

Background:

• Emotional disturbances are a significant public health concern.
• Animal models are crucial for understanding biological determinants and testing therapies.
• Zebrafish are emerging as a valuable alternative to rodents in biomedical research.

Purpose of the Study:

• To compare zebrafish behavioral responses to fear-evoking stimuli using three distinct methods.
• To evaluate the efficacy of live predators, robotic replicas, and animated images in eliciting fear responses.
• To assess the consistency and statistical power of different stimulus types.

Main Methods:

• A binary-choice test was employed to assess zebrafish behavior.
• Stimuli included a live predator (Astronotus ocellatus), a 3D robotic replica, and a 2D computer-animated image.
• Robotic and animated stimuli were designed based on the live predator's morphology and motion.

Main Results:

• Both live predators and robotic replicas elicited significant avoidance responses in zebrafish.
• Zebrafish exhibited increased thrashing behavior, a fear indicator, in response to the robotic predator.
• Robotic stimuli provided more consistent inter-individual responses compared to live or animated stimuli.

Conclusions:

• Robotic stimuli are effective in eliciting robust fear responses in zebrafish.
• Robotic models offer enhanced experimental consistency and statistical power for behavioral studies.
• Robotic stimuli represent a promising tool for high-throughput behavioral testing in zebrafish research.