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Effect of Pinealectomy on Thyroid Hormone (T 4 and T 3 ) Levels in Plasma During Annual Reproductive Cycle in the Freshwater Catfish, Clarias batrachus
Author(s) -
Nayak P.K.,
Singh T.P.
Publication year - 1987
Publication title -
journal of pineal research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.881
H-Index - 131
eISSN - 1600-079X
pISSN - 0742-3098
DOI - 10.1111/j.1600-079x.1987.tb00878.x
Subject(s) - pinealectomy , endocrinology , medicine , thyroid , clarias , hormone , triiodothyronine , pineal gland , biology , melatonin , radioimmunoassay , development of the gonads , catfish , gonad , fishery , fish <actinopterygii>
Thyroxine and triiodothyronine (T 3 ) were measured by radioimmunoassay in serum and thyroid gland of the freshwater teleost Clarias batrachus. Pinealectomy increased the glandular levels of the thyroid hormones but decreased the plasma levels of T 4 concomitantly with the increase of T 3 levels. Most of the effects of pinealectomy on thyroid hormones were restricted to the gonadal development periods. Pinealectomy has shown no significant impact on thyroid hormones during the other periods of the reproductive cycle. Thus, it appears that the pineal gland is inhibitory to thyroid hormones during gonadal development and maturation.