Oocyte structure and ultrastructure in the Mexican silverside fish Chirostoma humboldtianum (Atheriniformes: Atherinopsidae)

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Show simple item record Chavez, M Aley, P Espinosa, J Jiménez-García, LF González, JL Cárdenas-Vázquez, R 2011-01-22T10:25:53Z 2011-01-22T10:25:53Z 2008
dc.identifier.issn 347744
dc.description.abstract the structural and ultrastructural features of gonads from endemic Mexican fish have received scarce attention. This study describes the histological and ultrastructural characteristics of the oocyte in Chirostoma humboldtianum. The ovary is asynchronic, and as such, most phases of oocyte development are found in the same ovary. The complete process of oogenesis was divided in five stages: oogonium and folliculogenesis, primary growth, cortical alveoli and lipid inclusions, vitellogenesis and maturation. The presence of big filaments, which appear at the end of primary growth, induces some common follicular adaptation. During primary growth, abundant ribosomes, rough endoplasmic reticulum, and mitochondria are grouped in the cytoplasm. At the end of this stage, the 71 layer of the chorion is developed, while microvilli start to be evident as well. In the cortical alveoli and lipid droplets phase, intense PAS positive vesicles, some of them containing nucleoid material, are observed in the peripheral cytoplasm and the lipid droplets take a more central position. In vitellogenesis, the proteic yolk accumulates in a centripetal way while the chorion is completely formed. In maturation, the germinal vesicle migrates to the animal pole, meiosis is restored, and there is nuclear breakdown. The oocyte increases its size and holds some oil droplets and a big fluid mass of yolk. On the outside, filaments surround the oocyte completely. Rev. Biol. Trop. 56 (4): 1825-1835. Epub 2008 December 12. en_US
dc.language.iso en en_US
dc.title Oocyte structure and ultrastructure in the Mexican silverside fish Chirostoma humboldtianum (Atheriniformes: Atherinopsidae)
dc.type Artículo de investigación en_US
dc.identifier.idprometeo 580
dc.source.novolpages 56(4):1825-1835
dc.subject.wos Biology
dc.description.index WoS: SCI, SSCI o AHCI
dc.subject.keywords Chirostoma
dc.subject.keywords ovary
dc.subject.keywords ultrastructure
dc.subject.keywords oocyte
dc.subject.keywords teleost
dc.relation.journal Revista De Biologia Tropical
dc.description.Departamento Departamento de Biología Comparada

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