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The biological clock is involved in many aspects of regulating complex physiology in all animals. It was in 1935 when German zoologists, Hans Kalmus and Erwin Bünning, discovered the existence of circadian rhythm in Drosophila melanogaster. However, the internal molecular mechanisms behind the circadian clock remained a mystery until 1984, when Jeffrey C. Hall, Michael Rosbash, and Michael W. Young discovered the expression of the Per gene oscillating over a 24-hour cycle. In subsequent...
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Assaying Locomotor Activity to Study Circadian Rhythms and Sleep Parameters in Drosophila
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Sleep, circadian rhythms, and brain function in fish.

Ahmet Topal1

  • 1Department of Basic Sciences, Faculty of Fisheries, Atatürk University, Erzurum, Turkey.

Chronobiology International
|February 6, 2026
PubMed
Summary

Fish exhibit complex sleep-like states and circadian rhythms regulated by homeostatic sleep pressure and the circadian clock. Sleep deprivation impairs fish cognitive performance, highlighting evolutionary adaptations in sleep physiology.

Keywords:
Melatoninbraincircadian clocksfishsleep

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Area of Science:

  • Neurobiology
  • Chronobiology
  • Ethology

Background:

  • Teleost fish display complex biological organization related to sleep and circadian rhythms.
  • Sleep in fish is characterized by behavioral indicators like reduced activity and increased response thresholds.
  • Both homeostatic sleep pressure and the light-dark cycle-sensitive circadian clock regulate fish sleep.

Purpose of the Study:

  • To synthesize the neurobiological underpinnings of sleep-like states and circadian rhythm mechanisms in teleost fish.
  • To explore the influence of ecological and evolutionary factors on fish sleep physiology.
  • To understand how environmental stressors impact neural function and behavior in fish.

Main Methods:

  • Literature review synthesizing existing research on fish sleep and circadian rhythms.
  • Analysis of neurobiological, behavioral, and physiological data from various fish species.
  • Comparative study examining species-specific adaptations in sleep regulation.

Main Results:

  • Fish exhibit conserved, yet adaptable, sleep-like states and circadian regulation mechanisms.
  • Sleep deprivation negatively impacts cognitive functions, including learning, memory, and synaptic plasticity in fish.
  • Variations in sleep patterns across species suggest significant ecological and evolutionary shaping of sleep.

Conclusions:

  • Fish serve as a valuable model for investigating the molecular basis of circadian regulation.
  • Environmental stressors can significantly influence neural function and behavior in fish.
  • Understanding fish sleep provides insights into the broader evolution and function of sleep across vertebrates.