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Article: Early gonadal development and primary males in the protogynous epinepheline, Cephalopholis boenak

TitleEarly gonadal development and primary males in the protogynous epinepheline, Cephalopholis boenak
Authors
KeywordsBisexual
Epinephelinae
Gonads
Serranidae
Sexual pattern
Issue Date2004
PublisherBlackwell Publishing Ltd. The Journal's web site is located at http://www.blackwellpublishing.com/journals/JFB
Citation
Journal Of Fish Biology, 2004, v. 65 n. 4, p. 987-1002 How to Cite?
AbstractEarly gonadal development of the protogynous epinepheline, Cephalopholis boenak, was examined histologically in 289 specimens with standard length (L S) of 42-130 mm, collected from May 2000 to April 2002 in Hong Kong waters, to determine male developmental pathways and establish its sexual pattern. All juvenile gonads developed an ovarian lumen with primary-growth stage oocytes and scattered spermatogenic tissue prior to sexual differentiation and first sexual maturation. From this bisexual phase containing both female and male tissues, some gonads differentiated as ovaries with further oocyte growth to cortical-alveolus and vitellogenic stages, the rest differentiated as testes with the proliferation of spermatogenic tissue and the formation of a sperm sinus. All testes retained the lumen and primary-growth stage oocytes, and sperm sinuses ran within the gonad wall. Unlike most protogynous species, among functional males it was impossible to distinguish those resulting from juveniles through sexual differentiation (i.e. primary male) from those resulting from functional females through sex change (i.e. secondary male) based solely on testicular morphology. A proportion-spermatogenic-tissue index (I ST) was, therefore, developed and determined to be a reliable quantitative indicator for distinguishing differentiating, primary males before a sperm sinus was evident, from differentiating females during sexual differentiation. Since sexually transitional specimens with the concominant appearance of degenerating vitellogenic, or later, stage oocytes and spermatogenic tissue in the gonads were previously noted from Hong Kong, diandric, protogynous hermaphroditism is confirmed in C. boenak. For species, such as this and other epinephelines, in which all males have the same testicular morphology, a complete analysis of a wide range of body sizes from juveniles to adults is necessary for understanding male developmental pathways, and determining sexual pattern. © 2004 The Fisheries Society of the British Isles.
Persistent Identifierhttp://hdl.handle.net/10722/73162
ISSN
2015 Impact Factor: 1.246
2015 SCImago Journal Rankings: 0.952
References

 

DC FieldValueLanguage
dc.contributor.authorLiu, Men_HK
dc.contributor.authorSadovy, Yen_HK
dc.date.accessioned2010-09-06T06:48:44Z-
dc.date.available2010-09-06T06:48:44Z-
dc.date.issued2004en_HK
dc.identifier.citationJournal Of Fish Biology, 2004, v. 65 n. 4, p. 987-1002en_HK
dc.identifier.issn0022-1112en_HK
dc.identifier.urihttp://hdl.handle.net/10722/73162-
dc.description.abstractEarly gonadal development of the protogynous epinepheline, Cephalopholis boenak, was examined histologically in 289 specimens with standard length (L S) of 42-130 mm, collected from May 2000 to April 2002 in Hong Kong waters, to determine male developmental pathways and establish its sexual pattern. All juvenile gonads developed an ovarian lumen with primary-growth stage oocytes and scattered spermatogenic tissue prior to sexual differentiation and first sexual maturation. From this bisexual phase containing both female and male tissues, some gonads differentiated as ovaries with further oocyte growth to cortical-alveolus and vitellogenic stages, the rest differentiated as testes with the proliferation of spermatogenic tissue and the formation of a sperm sinus. All testes retained the lumen and primary-growth stage oocytes, and sperm sinuses ran within the gonad wall. Unlike most protogynous species, among functional males it was impossible to distinguish those resulting from juveniles through sexual differentiation (i.e. primary male) from those resulting from functional females through sex change (i.e. secondary male) based solely on testicular morphology. A proportion-spermatogenic-tissue index (I ST) was, therefore, developed and determined to be a reliable quantitative indicator for distinguishing differentiating, primary males before a sperm sinus was evident, from differentiating females during sexual differentiation. Since sexually transitional specimens with the concominant appearance of degenerating vitellogenic, or later, stage oocytes and spermatogenic tissue in the gonads were previously noted from Hong Kong, diandric, protogynous hermaphroditism is confirmed in C. boenak. For species, such as this and other epinephelines, in which all males have the same testicular morphology, a complete analysis of a wide range of body sizes from juveniles to adults is necessary for understanding male developmental pathways, and determining sexual pattern. © 2004 The Fisheries Society of the British Isles.en_HK
dc.languageengen_HK
dc.publisherBlackwell Publishing Ltd. The Journal's web site is located at http://www.blackwellpublishing.com/journals/JFBen_HK
dc.relation.ispartofJournal of Fish Biologyen_HK
dc.rightsJournal of Fish Biology. Copyright © Blackwell Publishing Ltd.en_HK
dc.subjectBisexualen_HK
dc.subjectEpinephelinaeen_HK
dc.subjectGonadsen_HK
dc.subjectSerranidaeen_HK
dc.subjectSexual patternen_HK
dc.titleEarly gonadal development and primary males in the protogynous epinepheline, Cephalopholis boenaken_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0022-1112&volume=65&spage=987&epage=1002&date=2004&atitle=Early+gonadal+development+and+primary+males+in+the+protogynous+epinepheline,+Cephalopholis+boenaken_HK
dc.identifier.emailSadovy, Y: yjsadovy@hkucc.hku.hken_HK
dc.identifier.authoritySadovy, Y=rp00773en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1111/j.1095-8649.2004.00503.xen_HK
dc.identifier.scopuseid_2-s2.0-5144230729en_HK
dc.identifier.hkuros95690en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-5144230729&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume65en_HK
dc.identifier.issue4en_HK
dc.identifier.spage987en_HK
dc.identifier.epage1002en_HK
dc.publisher.placeUnited Kingdomen_HK
dc.identifier.scopusauthoridLiu, M=55458126800en_HK
dc.identifier.scopusauthoridSadovy, Y=6603830002en_HK

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