Oogenesis in the swamp eel Synbranchus marmoratus (Bloch, 1795) (Teleostei; synbranchidae). Ovarian anatomy, stages of oocyte development and micropyle structure
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....
Guardado en:
| Publicado: |
2002
|
|---|---|
| Materias: | |
| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03279545_v26_n3_p325_Ravaglia http://hdl.handle.net/20.500.12110/paper_03279545_v26_n3_p325_Ravaglia |
| Aporte de: |
| id |
paper:paper_03279545_v26_n3_p325_Ravaglia |
|---|---|
| record_format |
dspace |
| spelling |
paper:paper_03279545_v26_n3_p325_Ravaglia2023-06-08T15:33:40Z Oogenesis in the swamp eel Synbranchus marmoratus (Bloch, 1795) (Teleostei; synbranchidae). Ovarian anatomy, stages of oocyte development and micropyle structure Micropyle Oogenesis Ovarian anatomy Synbranchidae animal tissue article controlled study eel female germ layer nonhuman oocyte development ovary ovary follicle cell scanning electron microscopy teleost vitelline membrane vitellogenesis Animals Egg Proteins Female Microscopy, Electron, Scanning Oocytes Oogenesis Oogonia Ovary Smegmamorpha Anguilliformes Animalia Monopterus albus Synbranchidae Synbranchus marmoratus Teleostei 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, prefollicular cells and epithelial cells. The complete oogenesis process is divided into four stages: oogonia, primary growth, cortical alveoli and vitellogenesis. Besides, the ovulated oocytes, and atretic structures were described. The structure of the micropyle was studied by scanning electron microscopy (MEB). Near the animal pole the vitelline envelope forms crests that fuse together becoming furrow-like structures with a slightly spiraled direction that converge into the micropyle pit where is located the micropylar canal. Although the sex reversal process of Synbranchids has been subject of many studies, this is the first complete description of the ovarian anatomy and oogenesis. 2002 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03279545_v26_n3_p325_Ravaglia http://hdl.handle.net/20.500.12110/paper_03279545_v26_n3_p325_Ravaglia |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Micropyle Oogenesis Ovarian anatomy Synbranchidae animal tissue article controlled study eel female germ layer nonhuman oocyte development ovary ovary follicle cell scanning electron microscopy teleost vitelline membrane vitellogenesis Animals Egg Proteins Female Microscopy, Electron, Scanning Oocytes Oogenesis Oogonia Ovary Smegmamorpha Anguilliformes Animalia Monopterus albus Synbranchidae Synbranchus marmoratus Teleostei |
| spellingShingle |
Micropyle Oogenesis Ovarian anatomy Synbranchidae animal tissue article controlled study eel female germ layer nonhuman oocyte development ovary ovary follicle cell scanning electron microscopy teleost vitelline membrane vitellogenesis Animals Egg Proteins Female Microscopy, Electron, Scanning Oocytes Oogenesis Oogonia Ovary Smegmamorpha Anguilliformes Animalia Monopterus albus Synbranchidae Synbranchus marmoratus Teleostei Oogenesis in the swamp eel Synbranchus marmoratus (Bloch, 1795) (Teleostei; synbranchidae). Ovarian anatomy, stages of oocyte development and micropyle structure |
| topic_facet |
Micropyle Oogenesis Ovarian anatomy Synbranchidae animal tissue article controlled study eel female germ layer nonhuman oocyte development ovary ovary follicle cell scanning electron microscopy teleost vitelline membrane vitellogenesis Animals Egg Proteins Female Microscopy, Electron, Scanning Oocytes Oogenesis Oogonia Ovary Smegmamorpha Anguilliformes Animalia Monopterus albus Synbranchidae Synbranchus marmoratus Teleostei |
| description |
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, prefollicular cells and epithelial cells. The complete oogenesis process is divided into four stages: oogonia, primary growth, cortical alveoli and vitellogenesis. Besides, the ovulated oocytes, and atretic structures were described. The structure of the micropyle was studied by scanning electron microscopy (MEB). Near the animal pole the vitelline envelope forms crests that fuse together becoming furrow-like structures with a slightly spiraled direction that converge into the micropyle pit where is located the micropylar canal. Although the sex reversal process of Synbranchids has been subject of many studies, this is the first complete description of the ovarian anatomy and oogenesis. |
| title |
Oogenesis in the swamp eel Synbranchus marmoratus (Bloch, 1795) (Teleostei; synbranchidae). Ovarian anatomy, stages of oocyte development and micropyle structure |
| title_short |
Oogenesis in the swamp eel Synbranchus marmoratus (Bloch, 1795) (Teleostei; synbranchidae). Ovarian anatomy, stages of oocyte development and micropyle structure |
| title_full |
Oogenesis in the swamp eel Synbranchus marmoratus (Bloch, 1795) (Teleostei; synbranchidae). Ovarian anatomy, stages of oocyte development and micropyle structure |
| title_fullStr |
Oogenesis in the swamp eel Synbranchus marmoratus (Bloch, 1795) (Teleostei; synbranchidae). Ovarian anatomy, stages of oocyte development and micropyle structure |
| title_full_unstemmed |
Oogenesis in the swamp eel Synbranchus marmoratus (Bloch, 1795) (Teleostei; synbranchidae). Ovarian anatomy, stages of oocyte development and micropyle structure |
| title_sort |
oogenesis in the swamp eel synbranchus marmoratus (bloch, 1795) (teleostei; synbranchidae). ovarian anatomy, stages of oocyte development and micropyle structure |
| publishDate |
2002 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03279545_v26_n3_p325_Ravaglia http://hdl.handle.net/20.500.12110/paper_03279545_v26_n3_p325_Ravaglia |
| _version_ |
1768544411415740416 |