Biweekly patterns of change in food consumption, plasma thyroid hormone and growth hormone levels, and in vitro hepatic monodeiodination of T4 in rainbow trout, oncorhynchus mykiss
Titel:
Biweekly patterns of change in food consumption, plasma thyroid hormone and growth hormone levels, and in vitro hepatic monodeiodination of T4 in rainbow trout, oncorhynchus mykiss
Auteur:
Farbridge, K. J. Leatherland, J. F.
Verschenen in:
Biological rhythm research
Paginering:
Jaargang 22 (1991) nr. 3 pagina's 237-248
Jaar:
1991-09
Inhoud:
The purpose of this study was to examine whether the previously identified biweekly patterns of change in the growth rate of rainbow trout, Oncorhynchus mykiss, are associated with similar patterns of change in aspects of thyroid hormone and growth hormone physiology, and to continue to test the hypothesis that the lunar cycle may be serving as a Zeitgeber for the synchronization of this phenomenon. A significant biweekly pattern of change was observed for food consumption, plasma L-thyroxine (T4), triiodo-L-thyronine (T3) and growth hormone (GH) levels, liver protein content, hepatosomatic index, hematocrit, and in vitro hepatic monodeiodination of T4. The correlation of high and/or low levels of these values with the occurrence of new and full moons is discussed.
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