Each organism has its own internal biological clock, which is reset by environmental cues (Zeitgebers), thus keeping it synchronized with the external environment. It is a chemically based oscillating system within cells, relying on molecular feedback loops. Circadian biological clocks exist in most organisms.What is so special about the clock in f
Introduction to Circadian Rhythms. The Pineal Organ of Fish. Pineal Photoreception and Temporal Physiology in Fish. Melatonin in Fish: Circadian Rhythm and Functions. Fishing for Links between the Circadian Clock and Cell Cycle. The Pineal Gland as a Source of Melatonin in Fish, and Influence of Light and Temperature on Melatonin Secretion. Cellular Clocks and the Importance of Light in Zebrafish. Feeding Rhythms in Fish: From Behavioral to Molecular Approach. Reproduction Rhythms in Fish. Influence of Melatonin on Hypothalamo-Pituitary-Ovarian Axis in Carp: Mechanism and Action. Circadian and Seasonal Rhythm in Secretion of Melatonin, Dopamine, and LH in Carp. Circadian Clocks in Retina of Goldfish.