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| Ravaglia,Mario Aldo; Maggese,María Cristina. |
| Synbranchus marmoratus (Synbranchidae), commonly known as the swamp eel, is a protogynous diandric teleost fish widely distributed throughout South America. The purpose of this work was to study the ovarian anatomy and to describe oocyte developmental stages in the swamp eel, Synbranchus marmoratus. S. marmoratus has a unique sacular ovary. It is covered by a conspicuous muscular wall, probably involved in an egg-releasing system acting as a peristaltic-like mechanism. The internal ovarian anatomy shows a U-shaped ovarian lamella delimiting a dorsal ovarian lumen. The microscopic study shows evidence of the existence of a germinal epithelium in the inner surface of the lamella, which contains germinal cells, pre-follicular cells and epithelial cells. The... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Synbranchidae; Ovarian anatomy; Oogenesis; Micropyle. |
| Ano: 2002 |
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0327-95452002000300003 |
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| Rizzo,Elizete; Moura,Thais F.C.; Sato,Yoshimi; Bazzoli,Nilo. |
| Cytological and cytochemical studies were carried out to investigate the surface characteristics of oocytes of four teleost species from the São Francisco river. The fishes were submitted to hypophysation at the Três Marias Hybrobiology and Fishculture Station, Minas Gerais, Brazil, in January 1996. Postspawning, oocytes of the curimatãs Prochilodus affinis, Prochilodus marggravii and dourado Salminus brasiliensis were surrounded by a thick, three-layered zona pellucida with radial striae. The surface of spawned oocytes of the surubim, Pseudoplatystoma coruscans, was comprised of mucous coat located externally to a thin, two-layered and striated zona pellucida. Oocyte activation during fertilization, lead to cortical reaction, formation of a perivitelline... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Zona pellucida; Oocyte surface; Mucous coat; Teleost; Micropyle. |
| Ano: 1998 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89131998000100005 |
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