Recent research on the circadian system of the zebrafish is reviewed. This teleost has
become an attractive model system because of its advantages for genetic analyses. Circadian …

A circadian oscillator that regulates visual function is located somewhere within the vertebrate
eye. To determine whether circadian rhythmicity is generated by retinal photoreceptors, …

Melatonin release was measured from zebrafish pineal organs and retinas maintained in
flow-through culture. Pineal organs released melatonin in a strong circadian rhythm through 5 …

As part of an effort to characterize the circadian system of the zebrafish, we examined the
circadian regulation of locomotor activity in adult males and females. Gross locomotor activity …

A circadian oscillator is located within the eye of Xenopus laevis. This oscillator regulates
retinal melatonin synthesis, stimulating it at night. The primary goal of the studies reported here …

Memory processes are modulated by the biological clock, although the mechanisms are
unknown. Here, we report that in the diurnal zebrafish both learning and memory formation of …

Circadian regulation of retinal function has now been shown in all classes of vertebrates and
attempts are now under way to understand the mechanisms underlying this regulation. The …

We investigated the time course of circadian system development in zebrafish and the role
of environmental light cycles in this process, using a rhythm in melatonin content of embryos …

THE zebrafish (Danio rerio) may be useful for mutational analyses of vertebrate circadian clock
mechanisms if efficient assays of circadian rhythmicity are available. Using an automated …

Current knowledge of the mechanisms of circadian and photic regulation of retinal melatonin
in vertebrates is reviewed, with a focus on recent progress and unanswered questions. 2. …