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 fish? Where is it located—in the retina, inside the brain, or in the pineal? What is the molecular basis of its function? How is the clock able to keep time in the absence of environmental cues?
Although biological clocks have been intensively studied over the past four decades, only recently have the tools needed to examine the molecular basis of circadian rhythms become available. This book reviews the state of knowledge in sufficient detail and presents the latest contributions to the field, showing fish provide a unique model of the circadian biological clock.
Introduction to Circadian Rhythms, Bronislaw Cymborowski
The Pineal Organ of Fish, Jack Falcón, Laurence Besseau, Elodie Magnanou, Sandrine Sauzet, Michael Fuentès, and Gilles Boeuf
Pineal Photoreception and Temporal Physiology in Fish, Peter Ekström and Hilmar Meissl
Melatonin in Fish: Circadian Rhythm and Functions, Russeel J. Reiter, Dan-Xian Tan, and Lucien C. Manchester
Fishing for Links between the Circadian Clock and Cell Cycle, Kajori Lahiri and Nicholas S. Foulkes
The Pineal Gland as a Source of Melatonin in Fish, and Influence of Light and Temperature on Melatonin Secretion, Wlodzimierz Popek and Elzbieta Cwioro
Cellular Clocks and the Importance of Light in Zebrafish, David Whitmore
Feeding Rhythms in Fish: From Behavioral to Molecular Approach, Jose Fernando López-Olmeda and Francisco Javier Sánchez-Vázquez
Reproduction Rhythms in Fish, Catarina Oliveria and Francisco Javier Sánchez-Vázquez
Influence of Melatonin on Hypothalamo-Pituitary-Ovarian Axis in Carp: Mechanism and Action, Wlodzimierz Popek, Ewa Dracg-Kozak, and Ewa Luszczek-Trojnar
Circadian and Seasonal Rhythm in Secretion of Melatonin, Dopamine, and LH in Carp, Wlodzimierz Popek, H. Natanek, and Ewa Luszczek-Trojnar
Circadian Clocks in Retina of Goldfish, P.M. Iuvone, E. Velarde, M.J. Delgado, A.L. Alonso-Gomez, and R. Haque