المستودع الأكاديمي جامعة المدينة

Group-synchronous ovarian development, spawning and spermiation in the European sea bass (Dicentrarchus labrax L.) could be regulated by shifts in gonadal steroidogenesi

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dc.creator Asturiano, Juan F.
dc.creator Sorbera, Lisa A.
dc.creator Ramos Jara, Jesús
dc.creator Kime, David E.
dc.creator Carrillo, Manuel
dc.creator Zanuy, Silvia
dc.date 2008-06-30T10:12:15Z
dc.date 2008-06-30T10:12:15Z
dc.date 2002
dc.date.accessioned 2017-01-31T02:14:15Z
dc.date.available 2017-01-31T02:14:15Z
dc.identifier Sci. Mar. 66(3): 273-282
dc.identifier 0214 - 8358 (print edition)
dc.identifier 1886 - 8134 (online edition)
dc.identifier http://hdl.handle.net/10261/5448
dc.identifier.uri http://dspace.mediu.edu.my:8181/xmlui/handle/10261/5448
dc.description Publicación online disponible en: http://www.icm.csic.es/scimar/index.php
dc.description European sea bass (Dicentrarchus labrax L.) is a species with group-synchronous ovarian development. A mechanism is required which enables maturation to occur in the first clutches of oocytes without inducing maturation in subsequent clutches. The present study examined the individual plasma variations of testosterone (T), 17,20b-dihydroxy-4-pregnen-3-one (17,20bP) and 17,20b,21-trihydroxy-4-pregnen-3-one (20bS) in both sexes, estradiol (E2) and vitellogenin (VTG) in females (n=15) and 11-ketotestosterone (11KT) in males (n=21), in an effort to elucidate the hormonal control of the reproductive cycle in this species. A sample of oocytes was obtained at every sampling from each female and the stage of development of the most advanced clutch of oocytes was determined and related to the individual hormone plasma levels. Total expressible milt was collected from males at each sampling during the spawning period and variations in the sperm production were related to hormone plasma levels. Successive elevations of plasma T and E2 levels were observed prior to peaks of progestagens, which resulted from the shift in gonadal steroidogenesis and coincided with the maturation-ovulation of the different clutches of oocytes or with increases in the sperm production. Following each progestagens wave, a new shift in gonadal steroidogenesis, resulting in a new elevation in plasma T and E2, was observed. This hormonal pattern was repeated several times depending on the number of ovulations per female. Results from the present study suggest a mechanism, based on shifts in gonadal steroidogenesis, which may be responsible for regulation of group-synchronous ovarian development, ovulation and spermiation in this species. In addition, evidence is presented which supports a role for both 17,20bP and 20bS as the maturation-inducing steroids (MIS) in male and female European sea bass.
dc.description This study was supported by EEC (AIR-CT93- 1005) and CICYT (MAR96-1859) and a Spanish- British Concerted Action (HB1997-0072) to M.C. and D.E.K. J.F.A. was supported by the Generalitat Valenciana. The authors wish to thank Dr. A.P. Scott (Lowestoft) for providing the antibodies to 17,20βP and 20βS.
dc.description Peer reviewed
dc.format 854955 bytes
dc.format application/pdf
dc.language eng
dc.publisher CSIC - Instituto de Ciencias del Mar (ICM)
dc.rights openAccess
dc.subject Dicentrarchus labrax
dc.subject Reproduction
dc.subject Hormones
dc.subject Fish
dc.subject Maturation-inducing steroid
dc.title Group-synchronous ovarian development, spawning and spermiation in the European sea bass (Dicentrarchus labrax L.) could be regulated by shifts in gonadal steroidogenesi
dc.type Artículo


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