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| Titel: |
Circadian Variation in Circulating Levels of Melatonin, Testosterone and Estradiol-17β in a Tropical Freshwater Catfish, Clarias batrachus, during Different Phases of the Annual Reproductive Cycle |
| Auteur: |
Roy, Sourindra Mohan Lal, Bechan Singh, T. P. |
| Verschenen in: |
Biological rhythm research |
| Paginering: | Jaargang 32 (2001) nr. 5 pagina's 569-578 |
| Jaar: |
2001-12 |
| Inhoud: |
In the present investigation, daily variations in plasma levels of melatonin, testosterone and estradiol-17β were analysed in the tropical freshwater catfish, Clarias batrachus during early and late-preparatory, pre-spawning, late-spawning and post-spawning phases of its annual reproductive cycle. Plasma melatonin levels exhibited a significant circadian rhythm during all the reproductive phases but peaks were invariably at night. The amplitude of melatonin was high during the early-preparatory phase and low in the pre-spawning phase. Testosterone also displayed significant rhythm during all the studied phases except post spawning phase. Estradiol-17β revealed diurnal rhythm only during preparatory and pre-spawning phases. The peak in the levels of plasma testosterone and estradiol-17β were recorded during the photophase. During the late-preparatory phase, the rhythm of testosterone coincided with the rhythm of estradiol-17β. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
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