Influence of season, gonadotropins, and gonadal hormones on the thyroid activity of freshwater perch, Anabas testudineus (Bloch)
- 1 February 1983
- journal article
- research article
- Published by Canadian Science Publishing in Canadian Journal of Zoology
- Vol. 61 (2), 359-364
- https://doi.org/10.1139/z83-047
Abstract
Perch thyroid activity fluctuated in different phases of the reproductive cycle, being highest at spawning and lowest at postspawning. Treatment of intact perch with salmon gonadotropin (SG-G100) or ovine luteinizing hormone (LH) (1 μg/100 g body weight) for 15 days markedly enhanced thyroid activity. The extent of stimulation was greater with SG-G 100 than with LH. Follicle-stimulating hormone (FSH) had no effect. Ovarian steroids, 17β-estradiol and estrone (100 ng/100 g body weight), also significantly augmented thyroid activity. There was a striking reduction of thyroid activity as a result of ovariectomy, a decrease that could not be improved by SG-G100; however, estrone or 17β-estradiol supplementation resulted in a significant increase of thyroid activity in comparison with ovariectomized controls. These findings suggest that gonadotropin mediated its stimulatory effect on perch thyroid activity via the release of ovarian steroids.Keywords
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