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Luteinizing hormone and sexual steroid plasma levels after treatment of European sea bass with sustained-release delivery systems for gonadotropin-releasing hormone analogue

AuthorsMañanós, Evaristo L. ; Carrillo, Manuel ; Sorbera, Lisa A.; Mylonas, Constantinos; Asturiano, Juan F.; Bayarri, María J. ; Zohar, Yonathan; Zanuy, Silvia
Issue Date2002
CitationJournal of Fish Biology 60(2): 328-339 (2002)
AbstractSpermiating male European sea bass Dicentrarchus labrax were treated with gonadotropin-releasing hormone agonists (GnRHa), either a GnRHa injection (IN; 25 μg kg-1 body mass) or one of three types of controlled-release GnRHa-delivery systems: fast release implants (EVAc; 100 μg kg-1), slow release implants (EVSL; 100 μg kg-1) and slow release microspheres (MC; 50 μg kg-1). Luteinizing hormone (LH) release was highly stimulated by all GnRHa treatments, with elevated plasma levels lasting for 2 days in injected fish (IN) and 2, 4 and 6 weeks in controlled-release-treated fish (EVAc, MC and EVSL, respectively), correlating with a 1, 3, 5 and 5 week period of stimulation of milt production, respectively. Plasma levels of the androgens testosterone (T) and 11-ketotestosterone (11-KT), were not significantly affected by the GnRHa treatments. Plasma T was high at early spermiation and declined sharply near the end of this period. Plasma 11-KT levels declined continuously throughout the experiment. Levels of 17,20β-dihydroxy-4-pregnen-3-one (17,20β-P), a proposed maturation-inducing steroid (MIS) in European sea bass, fluctuated around 0.2-1 ng ml-1 and were not greatly affected by the treatments. These results indicated a close correlation between sustained stimulation of LH release, achieved by GnRHa-delivery systems, and long-term enhancement of milt production. They also show an absence of changes in the common sex steroids, associated with elevated LH and enhanced spermiation. © 2002 The Fisheries Society of the British Isles.
Identifiersdoi: 10.1006/jfbi.2001.1839
issn: 0022-1112
e-issn: 1095-8649
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