Differential effects of melatonin on plasma levels of thyroxine and triiodothyronine levels in the air-breathing fish, Clarias gariepinus, during breeding and quiescent periods.
Effects of morning and evening injections of three doses of melatonin were studied on the plasma levels of thyroxine (T(4)) and triiodothyronine (T(3)) in an air-breathing fish Clarias gariepinus during its quiescent phase and breeding phase. Depending on seasons and time of administration, melatonin increased, decreased or had no effects on the plasma levels of T(4) and T(3). Present findings strongly suggest that melatonin is involved in the regulation of thyroid hormones in C. gariepinus, and differentially influences T(4) and T(3) level.
Gupta
B B P
BB
Department of Zoology, Environmental Endocrinology Laboratory, North-Eastern Hill University, Shillong 793 022, India. gupta@nehu.ac.in
Premabati
Y
Y
D000818:Animals; D001947:Breeding; D002940:Circadian Rhythm; D005399:Fishes / Q000097:blood*; D008297:Male; D008550:Melatonin / Q000008:administration & dosage / Q000494:pharmacology*; D012621:Seasons; D013974:Thyroxine / Q000097:blood*; D014284:Triiodothyronine / Q000097:blood*
D014284:Triiodothyronine; D008550:Melatonin; D013974:Thyroxine