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Circadian rhythm in goldfish visual sensitivity.

C J Bassi¹, M K Powers

¹Department of Psychology, Vanderbilt University, Nashville, Tennessee.

Investigative Ophthalmology & Visual Science

|November 1, 1987

Summary

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Goldfish vision is regulated by a circadian clock. This internal biological clock influences rod-mediated vision, showing daily rhythms even in constant darkness.

Area of Science:

Chronobiology
Vision Science
Animal Behavior

Background:

Circadian clocks regulate daily physiological and behavioral rhythms in many organisms.
The role of circadian regulation in fish vision, particularly rod-mediated vision, remains to be fully elucidated.

Purpose of the Study:

To investigate whether rod-mediated vision in goldfish is under circadian clock control.
To characterize the properties of visual threshold rhythms in goldfish.

Main Methods:

Absolute visual threshold was measured psychophysically in goldfish.
Measurements were taken under constant darkness conditions every 4 hours.
A diffuse 532 nm stimulus was used with no background light.

Main Results:

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A daily rhythm in visual threshold was observed, with lowest thresholds during the light-to-dark transition and highest during the dark-to-light transition.
The rhythm persisted for at least 7 days in constant darkness.
The rhythm could be entrained to a new light-dark cycle, with an amplitude of 0.5 log units and a period of approximately 24 hours.

Conclusions:

Rod-mediated vision in goldfish is regulated by an endogenous circadian oscillator.
These findings demonstrate the presence and entrainability of a circadian clock influencing visual sensitivity in fish.