"Why (Zebra)fish May Get Ulcers": Cognitive and Social Modulation of Stress in Fish

Area of Science:

• Neuroscience
• Animal Behavior
• Comparative Psychology

Background:

• The idea that fish cannot experience psychological stress persists, partly due to lacking a neocortex.
• Emerging evidence indicates teleosts (bony fish) can undergo psychological stress, a subjective experience of stressors.
• Research is beginning to unveil the mechanisms behind stress in fish.

Purpose of the Study:

• To investigate the role of cognitive appraisal in fish stress responses.
• To explore individual differences in stress perception (cognitive biases) in fish.
• To understand how social context influences stress reactivity in fish.

Main Methods:

• Assessing cognitive appraisal of stressors in fish.
• Identifying and analyzing cognitive biases (optimism/pessimism) in fish.
• Examining the effects of social context on stress responses.

Main Results:

• Cognitive appraisal significantly modulates fish stress responses, emphasizing subjective evaluation over stimulus characteristics.
• Individual cognitive biases, such as optimism and pessimism, are present in fish.
• These biases lead to consistent differences in stress reactivity and disease resilience.

Conclusions:

• Fish exhibit psychological stress, impacting their health and potentially leading to stress-related conditions like ulcers.
• Subjective experience and cognitive biases play a crucial role in how fish perceive and respond to stressors.
• Social interactions can buffer or amplify stress responses in fish.