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Article: A radioimmunoassay study of the plasma levels of sex steroids in the protandrous, sex-reversing fish rhabdosargus sarba (sparidae)

TitleA radioimmunoassay study of the plasma levels of sex steroids in the protandrous, sex-reversing fish rhabdosargus sarba (sparidae)
Authors
Issue Date1987
PublisherAcademic Press. The Journal's web site is located at http://www.elsevier.com/locate/ygcen
Citation
General And Comparative Endocrinology, 1987, v. 66 n. 3, p. 353-363 How to Cite?
AbstractBy Celite chromatography and radioimmunoassay, the levels of free and conjugated forms of androstenedione, testosterone, 11-oxotestosterone, 11β-hydroxytestosterone, 17β-estradiol, and estrone have been determined in the plasma of the protandrous sex-reversing Rhabdosargus sarba at different sexual phases throughout the seasonal reproductive cycle. Free androstenedione showed a significant increase during the spawning period in the functional male phase, while a prespawning increase in both the free and the conjugated androstenedione was found in the female phase. The level of testosterone remained fairly constant throughout the reproductive cycle in all sexual phases except the intersexual phase, which was found to have a slight increase in the free testosterone level during the spawning period. Females showed a prespawning increase in free 17β-estradiol and conjugated estrone; the former dropped while the latter remained unchanged in the succeeding spawning period. A prespawning rise of conjugated 17β-estradiol was also found in the male specimens. The level of free estrone was undetectable in the plasma of Rhabdosargus. No variation in the levels of 11-oxotestosterone and 11β-hydroxytestosterone was found in the different sexual phases throughout the reproductive cycle. The present study showed that in general the steroid patterns in the male and intersexual phases were basically similar, except perhaps that the levels of conjugated 17β-estradiol, conjugated androstenedione, and free testosterone were slightly higher in the intersex than in the male during the spawning period. The changes in the plasma levels of sex steroids were correlated with the structural transformation in the gonad and the seasonal cycle of the fish. The results were analyzed with special references to the phenomenon of natural sex reversal and to the endocrine patterns known in other teleost fishes. © 1987.
Persistent Identifierhttp://hdl.handle.net/10722/173118
ISSN
2015 Impact Factor: 2.667
2015 SCImago Journal Rankings: 1.245
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorYeung, WSBen_US
dc.contributor.authorChan, STHen_US
dc.date.accessioned2012-10-30T06:28:02Z-
dc.date.available2012-10-30T06:28:02Z-
dc.date.issued1987en_US
dc.identifier.citationGeneral And Comparative Endocrinology, 1987, v. 66 n. 3, p. 353-363en_US
dc.identifier.issn0016-6480en_US
dc.identifier.urihttp://hdl.handle.net/10722/173118-
dc.description.abstractBy Celite chromatography and radioimmunoassay, the levels of free and conjugated forms of androstenedione, testosterone, 11-oxotestosterone, 11β-hydroxytestosterone, 17β-estradiol, and estrone have been determined in the plasma of the protandrous sex-reversing Rhabdosargus sarba at different sexual phases throughout the seasonal reproductive cycle. Free androstenedione showed a significant increase during the spawning period in the functional male phase, while a prespawning increase in both the free and the conjugated androstenedione was found in the female phase. The level of testosterone remained fairly constant throughout the reproductive cycle in all sexual phases except the intersexual phase, which was found to have a slight increase in the free testosterone level during the spawning period. Females showed a prespawning increase in free 17β-estradiol and conjugated estrone; the former dropped while the latter remained unchanged in the succeeding spawning period. A prespawning rise of conjugated 17β-estradiol was also found in the male specimens. The level of free estrone was undetectable in the plasma of Rhabdosargus. No variation in the levels of 11-oxotestosterone and 11β-hydroxytestosterone was found in the different sexual phases throughout the reproductive cycle. The present study showed that in general the steroid patterns in the male and intersexual phases were basically similar, except perhaps that the levels of conjugated 17β-estradiol, conjugated androstenedione, and free testosterone were slightly higher in the intersex than in the male during the spawning period. The changes in the plasma levels of sex steroids were correlated with the structural transformation in the gonad and the seasonal cycle of the fish. The results were analyzed with special references to the phenomenon of natural sex reversal and to the endocrine patterns known in other teleost fishes. © 1987.en_US
dc.languageengen_US
dc.publisherAcademic Press. The Journal's web site is located at http://www.elsevier.com/locate/ygcenen_US
dc.relation.ispartofGeneral and Comparative Endocrinologyen_US
dc.subject.meshAndrostenedione - Blooden_US
dc.subject.meshAnimalsen_US
dc.subject.meshEstradiol - Blooden_US
dc.subject.meshFemaleen_US
dc.subject.meshGlucuronates - Blooden_US
dc.subject.meshGonadal Steroid Hormones - Blooden_US
dc.subject.meshHermaphroditic Organismsen_US
dc.subject.meshMaleen_US
dc.subject.meshPerciformes - Blooden_US
dc.subject.meshRadioimmunoassay - Methodsen_US
dc.subject.meshSex Determination Processesen_US
dc.subject.meshTestosterone - Blooden_US
dc.titleA radioimmunoassay study of the plasma levels of sex steroids in the protandrous, sex-reversing fish rhabdosargus sarba (sparidae)en_US
dc.typeArticleen_US
dc.identifier.emailYeung, WSB:wsbyeung@hkucc.hku.hken_US
dc.identifier.authorityYeung, WSB=rp00331en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1016/0016-6480(87)90244-9-
dc.identifier.pmid3609706en_US
dc.identifier.scopuseid_2-s2.0-0023355658en_US
dc.identifier.volume66en_US
dc.identifier.issue3en_US
dc.identifier.spage353en_US
dc.identifier.epage363en_US
dc.identifier.isiWOS:A1987H486100007-
dc.publisher.placeUnited Statesen_US
dc.identifier.scopusauthoridYeung, WSB=7102370745en_US
dc.identifier.scopusauthoridChan, STH=24368283200en_US

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