Desenvolvimento e diferenciação dos ovócitos de pacu, Piaractus mesopotamicus (Holmberg, 1887) (Osteichthyes, Characidae)

Elizabeth Romagosa; Massuka Yamane Narahara

doi:10.4025/actascibiolsci.v24i0.2316

Oocyte development and differentiation in pacu, Piaractus mesopotamicus (Holmberg, 1887) (Osteichthyes, Characidae)

Elizabeth Romagosa APTA
Massuka Yamane Narahara APTA

DOI: https://doi.org/10.4025/actascibiolsci.v24i0.2316

Abstract

This work aim is to clarify doubts about the Piaractus mesopotamicus (Osteichthyes, Characidae) oocyte ultrastructural development and differentiation, following the transformations during the ovogenic processes, such as formation and accumulation of various organelles, nucleolar and/or citoplasmic inclusions, and follicular wall (envelope). During the primary growth phase, Balbiani corpuscles are evident, but their role is not clear. The peculiar lamellae structures are also present. The second phase (secondary growth) is initially characterized by cortical alveolus formation. After that, protein yolk granules appear in the peripherical regions, where mitochondria and ribosomes are abundant. Changes in the follicle epitelium (granulosa) are described together with the radiate zone formation, which constitutes the follicular envelope.

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Author Biography

Elizabeth Romagosa, APTA

Possui graduação em Biologia pela Universidade de Guarulhos (1977), mestrado em Ciências Biológicas (Zoologia) pela Universidade Estadual Paulista Júlio de Mesquita Filho (1991) e doutorado em Ecologia e Recursos Naturais pela Universidade Federal de São Carlos (1998). Atualmente é pesquisador cientifico nivel VI do Instituto de Pesca, professor doutor pesquisador da Universidade Estadual Paulista Júlio de Mesquita Filho e chefia Assistente técnico do Instituto de Pesca - APTA e credenciada na pós-graduação em Aquicultura e Pesca do IPesca-APTA, SP. Tem experiência na área de Ecologia, com ênfase em Reprodução de Peixes, atuando principalmente nos seguintes temas: biologia reprodutiva, fisiologia da reprodução, ciclo reprodutivo, comportamento reprodutivo e sistemas de criação (viveiros escavados e tanques-rede). Vem pesquisando as seguintes espécies de peixes: Piaractus mesopotamicus, Brycon cephalus, Rhamdia quelen, Pseudoplatystoma fasciatum, P. corruscans e O. niloticus. Mais recentemente, vem atuando com peixes ornamentais como Apistogrammma cacautoides Currículo Lattes

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Published

2008-05-13

How to Cite

Romagosa, E., & Narahara, M. Y. (2008). Oocyte development and differentiation in pacu, Piaractus mesopotamicus (Holmberg, 1887) (Osteichthyes, Characidae). Acta Scientiarum. Biological Sciences, 24, 433-438. https://doi.org/10.4025/actascibiolsci.v24i0.2316

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Issue

Vol 24 (2002)

Section

Biology Sciences

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