Oogenesis in Laetacara araguaiae (Ottoni and Costa, 2009) (Labriformes: Cichlidae).
We aimed to analyze the oogenesis of adult females of the cichlid fish Laetacara araguaiae. The specimens' gonads were removed and processed for light and transmission electron microscopy. Oogenesis in L. araguaiae showed the following characteristics: a germinal epithelium with three types of oogonia (A-undifferentiated, A-differentiated and B-oogonia), oocytes at meiotic prophase stage and ovarian follicle formation. Oocytes showing primary growth with pre-vitellogenic and cortical alveolus were observed. Similar to data for other cichlids, oocytes in secondary growth or vitellogenesis were characterized by the initial deposition of yolk microgranules. The event that characterizes the maturation stage is nucleolus migration, also called the germinal vesicle, to the oocyte periphery in the direction of the micropyle. The follicular complex undergoes several changes throughout the oocyte stages. To the best of our knowledge this study is the first to describe L. araguaiae oogenesis. Moreover, this study is the first step to better understand the reproductive biology of this species, which shows great potential for use as an ornamental fish.
Programa de Pós Graduação em Ciências Biológicas-IB/UNESP - Univ. Estadual Paulista,Campus de Botucatu,SP,Brasil.
Amanda Pereira
AP
Dos Santos-Silva
Programa de Pós Graduação em Biologia Animal-IBILCE/UNESP-Univ. Estadual Paulista,Campus de S.J. Rio Preto,SP,Brasil.
Diógenes Henrique
DH
de Siqueira-Silva
Laboratorio de Ictiologia Neotropical - L.I.NEO.,Departmento de Biologia e Zootecnia,FEIS/UNESP - Univ. Estadual Paulista 'Julio de Mesquita Filho',Rua Moncao,226 - Zona Norte 15385-000 - Ilha Solteira,São Paulo,Brasil.
Alexandre
A
Ninhaus-Silveira
Department of Biology and Zootechny,FEIS/UNESP - Univ. Estadual Paulista 'Julio de Mesquita Filho',Rua Monção,226,Zona Norte,Ilha Solteira,SP,15385-000,Brazil.
Rosicleire
R
Veríssimo-Silveira
D000818:Animals; D023681:Cichlids; D005260:Female; D046529:Microscopy, Electron, Transmission; D009865:Oocytes / Q000166:cytology / Q000502:physiology* / Q000648:ultrastructure; D009866:Oogenesis / Q000502:physiology*; D009867:Oogonia / Q000166:cytology / Q000502:physiology* / Q000648:ultrastructure; D006080:Ovarian Follicle / Q000166:cytology / Q000502:physiology* / Q000648:ultrastructure
Fish; Folliculogenesis; Maturation; Oogonia; Vitellogenesis