Corpus ID: 1747306

Sleep in fishes

  title={Sleep in fishes},
  author={S. G. Reebs},
Do fishes sleep? This is not an easy question. It depends on what you mean by “sleep”. Most sleep researchers, being focused on mammals, recognise sleep when they see distinctive patterns of electrical activity of the brain. Fish, however, lack the complex brain structures from where these patterns originate. Another criterion to define sleep, used mainly in the field or in situations where electroencephalographs are not available, is prolonged eye closure. But fish do not have eyelids! 
Effect of feeding with different dietary protein levels and starvation on the health, nonspecific immune parameters, behavior and histoarchitectures of fantail goldfish (Carassius auratus L.).
It is clarified that significant high growth rate, improved welfare; decrease aggressive behavior, improved biochemical serum parameters and immune response were observed in group feed with diet containing 45% crude protein. Expand


Plasticity of diel and circadian activity rhythms in fishes
  • S. G. Reebs
  • Biology
  • Reviews in Fish Biology and Fisheries
  • 2004
It is argued that most fish species have a circadian system but that havingsuch a system does not necessarily imply strict diurnalism or nocturnalism, and that Rigidity ofactivity phase seems more common in species that display behavioral sleep. Expand
Fish Behaviour by Day, Night and Twilight
The simple diel cycle of rising and setting of the sun imposes on the behaviour and activity of fishes a dramatic, overriding set of predictable constraints. As a direct result, many kinds ofExpand
Effect of rest deprivation on motor activity of fish
The results indicate that homeostatic mechanisms are involved in the regulation of rest and activity in fish and may be similar to those underlying sleep regulation in mammals. Expand
Temporal Structure in Stickleback Behaviour
Research was started into a possible circadian periodicity in the behaviour of the threespined stickleback, and 'rest- periods' were found, lasting some 10 to 50 minutes, in which the fish was surprisingly inactive, and did not visit the nest. Expand
Temperature-dependent switch between diurnal and nocturnal foraging in salmon
It is demonstrated that juvenile Atlantic salmon, Salmo salar, switch between diurnal and nocturnal foraging solely in response to environmental temperature, and independently of photoperiod and season. Expand
The Behaviour of Minnows in Relation to Light Intensity
It is shown that minnows appear to avoid bright light by a comparison of intensities if the light-dark boundary is sharp, but they may also respond to light photokinetically. Expand
Twilight Activities and Temporal Structure in a Freshwater Fish Community
Underwater observations of temperate lake fishes suggest that their twilight activities are basically similar to those described by other researchers for coral reef fishes, with variations in aggressive, cleaning, and comfort behavior at dusk and by day. Expand
Feeding entrainment of locomotor activity rhythms in the goldfish is mediated by a feeding-entrainable circadian oscillator
Some properties of feeding entrainment suggested that goldfish have a separate but tightly coupled light- and food-entrainable oscillators, or a single oscillator that is entrainable by both light and food (one synchronizer being eventually stronger than the other). Expand
Differential Effects of Meal Size and Food Energy Density on Feeding Entrainment in Goldfish
Results suggest that gut distension may be involved in feeding entrainment, as a reduction in meal size but not in the amount of dietary energy supplied significantly shortened the time required for resynchronization. Expand
Locomotor activity of river lamprey Lampetra fluviatilis (L.) during the spawning season
At high latitudes (62–64°N) the river lamprey Lampetra fluviatilis (L.) is shown to have a 24-hr locomotor activity during its spawning period just before midsummer. By keeping lampreys in coldExpand