Female germ cell renewal during the annual reproductive cycle in Ostariophysians fish

dc.contributorUniversidade Estadual Paulista (UNESP)
dc.creatorWildner, Daniel Dantas
dc.creatorGrier, Harry
dc.creatorQuagio-Grassiotto, Irani
dc.date2014-05-27T11:28:35Z
dc.date2016-10-25T18:45:00Z
dc.date2014-05-27T11:28:35Z
dc.date2016-10-25T18:45:00Z
dc.date2013-03-01
dc.date.accessioned2017-04-06T02:15:17Z
dc.date.available2017-04-06T02:15:17Z
dc.identifierTheriogenology, v. 79, n. 4, p. 709-724, 2013.
dc.identifier0093-691X
dc.identifierhttp://hdl.handle.net/11449/74689
dc.identifierhttp://acervodigital.unesp.br/handle/11449/74689
dc.identifier10.1016/j.theriogenology.2012.11.028
dc.identifierWOS:000315017500019
dc.identifier2-s2.0-84873153063.pdf
dc.identifier2-s2.0-84873153063
dc.identifierhttp://dx.doi.org/10.1016/j.theriogenology.2012.11.028
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/895450
dc.descriptionThe objective was to characterize female germ cell renewal during the annual reproductive cycle in two species of ostariophysian fish with distinct reproductive strategies: a siluriform, Pimelodus maculatus, in which oocyte development is group synchronous and the annual reproductive period is short; and a characiform, Serrasalmus maculatus, with asynchronous oocyte development and a prolonged reproductive period. These reproductive strategies result in fish determinate and indeterminate fecundity, respectively. Annual reproductive phases were determined by biometric and histologic analysis of gonads and interpreted according to new proposals for phase classification and stages of oocyte development (with special attention to germinal epithelium activity). Histologically, there were two types of oogonia in the germinal epithelium: single oogonia and those in mitotic proliferation. Oogonial proliferation and their entry into meiosis resulted in formation of cell nests (clusters of cells in the ovarian lamellae). Morphometric analysis was used to estimate germ cell renewal. Based on numbers of single oogonia in the lamellar epithelium, and nests with proliferating oogonia or early prophase oocytes throughout the annual reproductive cycle, oogonial proliferation and entrance into meiosis were more intense during the regenerating phase and developing phase, but decreased sharply (P < 0.05) during the spawning-capable phase. Oogonial proliferation gradually recovered during the regressing phase. We concluded that, independent of species or features of the reproductive cycle, germ cell renewal occurred during the regenerating phase, ensuring availability of eggs for the spawning event. © 2013 Elsevier Inc.
dc.languageeng
dc.relationTheriogenology
dc.rightsinfo:eu-repo/semantics/openAccess
dc.subjectCell renewal
dc.subjectEarly prophase oocyte
dc.subjectOogonia
dc.subjectReproductive cycle
dc.subjectReproductive phase
dc.subjectanimal
dc.subjectcell proliferation
dc.subjectCharaciformes
dc.subjectcytology
dc.subjectfemale
dc.subjectfish
dc.subjectgrowth, development and aging
dc.subjectmeiosis
dc.subjectoocyte
dc.subjectovary
dc.subjectphysiology
dc.subjectprophase
dc.subjectreproduction
dc.subjectseason
dc.subjectAnimals
dc.subjectCell Proliferation
dc.subjectFemale
dc.subjectFishes
dc.subjectMeiosis
dc.subjectOocytes
dc.subjectOvary
dc.subjectProphase
dc.subjectReproduction
dc.subjectSeasons
dc.subjectPimelodus maculatus
dc.subjectSerrasalmus
dc.subjectSiluriformes
dc.titleFemale germ cell renewal during the annual reproductive cycle in Ostariophysians fish
dc.typeOtro


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