Female Germ Cell Renewal During The Annual Reproductive Cycle In Ostariophysians Fish.

dc.creatorWildner, Daniel Dantas
dc.creatorGrier, Harry
dc.creatorQuagio-Grassiotto, Irani
dc.date2013-Mar
dc.date2015-11-27T13:31:13Z
dc.date2015-11-27T13:31:13Z
dc.date.accessioned2018-03-29T01:17:02Z
dc.date.available2018-03-29T01:17:02Z
dc.identifierTheriogenology. v. 79, n. 4, p. 709-24, 2013-Mar.
dc.identifier1879-3231
dc.identifier10.1016/j.theriogenology.2012.11.028
dc.identifierhttp://www.ncbi.nlm.nih.gov/pubmed/23317762
dc.identifierhttp://repositorio.unicamp.br/jspui/handle/REPOSIP/200438
dc.identifier23317762
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/1300671
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.
dc.description79
dc.description709-24
dc.languageeng
dc.relationTheriogenology
dc.relationTheriogenology
dc.rightsfechado
dc.rightsCopyright © 2013 Elsevier Inc. All rights reserved.
dc.sourcePubMed
dc.subjectAnimals
dc.subjectCell Proliferation
dc.subjectCharaciformes
dc.subjectFemale
dc.subjectFishes
dc.subjectMeiosis
dc.subjectOocytes
dc.subjectOogonia
dc.subjectOvary
dc.subjectProphase
dc.subjectReproduction
dc.subjectSeasons
dc.titleFemale Germ Cell Renewal During The Annual Reproductive Cycle In Ostariophysians Fish.
dc.typeArtículos de revistas


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