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

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Summary

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.

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Author information

Authors and Affiliations

  1. Department of Pharmacology and Toxicology, Medical College of Wisconsin, 53226, Milwaukee, Wisconsin, USA

    D. N. Weber & R. E. Spieler

  2. Vertebrate Zoology, Milwaukee Public Museum, 53233, Milwaukee, Wisconsin, USA

    D. N. Weber & R. E. Spieler

Authors
  1. D. N. Weber
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  2. R. E. Spieler
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Additional information

We thank Mark Goodrich and Steve Huber for fish maintenance and technical assistance; and Don Dovala for aid in developing the automatic feeder. The research was funded in part by NIH, AM 25191 and NIEHS, ES No. 01985.

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Weber, D.N., Spieler, R.E. Effects of the light-dark cycle and scheduled feeding on behavioral and reproductive rhythms of the cyprinodont fish, Medaka,Oryzias latipes. Experientia 43, 621–624 (1987). https://doi.org/10.1007/BF02126355

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  • DOI: https://doi.org/10.1007/BF02126355

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