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Biology of Reproduction, Vol 57, 669-675, Copyright © 1997 by Society for the Study of Reproduction

ARTICLES

Changes in plasma gonadotropin II and sex steroid hormones, and sperm production of striped bass after treatment with controlled-release gonadotropin-releasing hormone agonist-delivery systems

CC Mylonas, AP Scott, EL Vermeirssen and Y Zohar
Center of Marine Biotechnology, University of Maryland Biotechnology Institute, Baltimore 21202, USA.

Spermiating striped bass, a perciform fish, were treated with two controlled-release gonadotropin-releasing hormone agonist (GnRHa)- delivery systems, and the resulting changes in plasma gonadotropin II (GTH II), testosterone (T), 11-ketotestosterone (11-KT), 17,20beta- dihydroxy-4-pregnen-3-one (17,20beta-P), and 17,20beta,21-trihydroxy-4- pregnen-3-one (17,20beta,21-P) were correlated with changes in milt production and sperm density. GnRHa-delivery systems induced a sustained elevation of plasma GnRHa and GTH II for 14 days. Plasma T levels were unchanged after GnRHa treatment, while 11-KT levels increased significantly. Plasma 17,20beta-P also increased after GnRHa treatment and remained elevated compared to levels in controls, while plasma 17,20beta,21-P levels were unaffected. Both GnRHa-delivery systems induced many-fold increases in total expressible milt, lasting throughout the 14 days of the study. Sperm density decreased 2 days after GnRHa treatment, with a subsequent increase by Day 7. This study demonstrates that GnRHa-delivery systems induce a sustained elevation of plasma GTH II levels in striped bass, resulting in a long-term enhancement of milt production. The endocrine changes observed suggest that 11-KT and 17,20beta-P, but not 17,20beta,21 -P, are mediating the effects of GTH II on spermiation.


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S. Hassin, M. Claire, H. Holland, and Y. Zohar
Early Maturity in the Male Striped Bass, Morone saxatilis: Follicle-Stimulating Hormone and Luteinizing Hormone Gene Expression and Their Regulation by Gonadotropin-Releasing Hormone Analogue and Testosterone
Biol Reprod, December 1, 2000; 63(6): 1691 - 1697.
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Copyright © 1997 by the Society for the Study of Reproduction.