碩士 / 國立海洋大學 / 水產養殖學系 / 90 / Abstract
The objectives of this studies were to investigate the effects of reproductive and metabolic hormones in the reproductive endocrinology and reproduction in Japanse eel, Anguilla japonica. Salmon pituitary extract (SPE) stimulated brain mGnRH content, pituitary LH content, estradiol and testosterone level. Estradiol and dihydrotestosterone (DHT) potentiated the stimulatory effects of SPE. Eels cultured at low temperatures had a higher pituitary LH and gonadosomatic index (GSI) than eels cultured at high temperatures. Insulin alone stimulated male gonadal development, brain mGnRH and pituitary LH content at a dose-dependent effect. SPE + Insulin could rapidly increase content of brain mGnRH and decrease content of pituitary LH in male eel. Long-term injection of hCG can increase content of brain mGnRH and pituitary LH. hCG + Insulin stimulated the increase of brain mGnRH content in a short time. The data also demonstrated that insulin could potentiate the stimulatory effect of hCG in pituitary LH content. Eels with less gonadal development had higher content of brain mGnRH and pituitary LH and concentrations of plasma LH and estradiol than normal eel. Sex steroids stimulated brain mGnRH and pituitary LH content; but plasma LH levels were not increased as compared to the control. Low dose of cortisol increased brain mGnRH and pituitary LH content. T3 also stimulated brain mGnRH and pituitary LH content at a dose-dependent effect. The study suggest that metabolic hormones were closedly associated with the regulation of reproductive hormones and gonadal development in eels.
| Identifer | oai:union.ndltd.org:TW/090NTOU0086018 |
| Date | January 2002 |
| Creators | Chia yung Chen, 陳家勇 |
| Contributors | C. F. Chang, 張清風 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 0 |
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