Effects of the light-dark cycle and scheduled feeding on behavioral and reproductive rhythms of the cyprinodont fish, Medaka,Oryzias latipes

• DOI: 10.1007/bf02126355
• Publication Date: 2005-09-14T12:27:56Z
• Authors: D. N. Weber; R. E. Spieler
• Keywords: Male; 0301 basic medicine; Behavior; Periodicity; Oryzias latipes; Behavior, Animal; Light; Oviposition; Reproduction; Oryzias; Marine Biology; Oceanography and Atmospheric Sciences and Meteorology; Circadian Rhythm; Cyprinodontiformes; 03 medical and health sciences; Food; Meal-feeding; Environmental factors; Animals; Circadian rhythms; Female; Zeitgebers; 14. Life underwater; Agonistic Behavior

Medaka were maintained on a 16:8 light-dark cycle and fed once daily on one of 5 different feeding schedules. The daily rhythm of agonistic behavior rapidly entrained to the scheduled feeding time and maintained this entrainment during a 3-day starvation period. In contrast the daily rhythms of egg laying and courtship stayed entrained to the L:D cycle regardless of the feeding schedule. Thus, temporal integration of this fish with its daily environment can involve multistimuli which concurrently and differentially entrain externally expressed circadian systems.