Presence of primary and secondary males in a population of the protogynous Synbranchus marmoratus
Synbranchus marmoratus, the 'swamp eel', is a protogynous diandric fish. The primary and secondary male can be distinguished from each other easily by differences in gonadal morphology. Primary males have lobular, unrestricted testes with central efferent ducts. The secondary male has a &#...
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1996
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00221112_v49_n5_p788_LoNostro http://hdl.handle.net/20.500.12110/paper_00221112_v49_n5_p788_LoNostro |
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paper:paper_00221112_v49_n5_p788_LoNostro2023-06-08T14:45:51Z Presence of primary and secondary males in a population of the protogynous Synbranchus marmoratus diandric gonads hermaphroditism protogynous sex reversal Synbranchidae Synbranchus marmoratus Synbranchus marmoratus hermaphroditism primary male protogyny secondary male sex reversal swamp-eel Synbranchus marmoratus, the 'swamp eel', is a protogynous diandric fish. The primary and secondary male can be distinguished from each other easily by differences in gonadal morphology. Primary males have lobular, unrestricted testes with central efferent ducts. The secondary male has a 'lamellar' testis, efferent ducts are present in the ventral region (new formation), lateral supports and it is covered by the former ovarian capsule. The length of primary male varies from 13 to 88 cm while secondary males range from 56 to 91 cm. Transitional individuals vary between 45 and 60 cm in length. The swamp eel population studied is composed of 80% primary males and 20% secondary males. Although gonadosomatic indices are always higher in primary males, they increase in secondary ones as the newly acquired stage progresses. The lamellar organization of the gonad of secondary males, the absence of this kind of testis in individuals smaller than 56 cm, and the presence of hermaphroditic fish, is evidence for protogyny in this species. 1996 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00221112_v49_n5_p788_LoNostro http://hdl.handle.net/20.500.12110/paper_00221112_v49_n5_p788_LoNostro |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
diandric gonads hermaphroditism protogynous sex reversal Synbranchidae Synbranchus marmoratus Synbranchus marmoratus hermaphroditism primary male protogyny secondary male sex reversal swamp-eel |
| spellingShingle |
diandric gonads hermaphroditism protogynous sex reversal Synbranchidae Synbranchus marmoratus Synbranchus marmoratus hermaphroditism primary male protogyny secondary male sex reversal swamp-eel Presence of primary and secondary males in a population of the protogynous Synbranchus marmoratus |
| topic_facet |
diandric gonads hermaphroditism protogynous sex reversal Synbranchidae Synbranchus marmoratus Synbranchus marmoratus hermaphroditism primary male protogyny secondary male sex reversal swamp-eel |
| description |
Synbranchus marmoratus, the 'swamp eel', is a protogynous diandric fish. The primary and secondary male can be distinguished from each other easily by differences in gonadal morphology. Primary males have lobular, unrestricted testes with central efferent ducts. The secondary male has a 'lamellar' testis, efferent ducts are present in the ventral region (new formation), lateral supports and it is covered by the former ovarian capsule. The length of primary male varies from 13 to 88 cm while secondary males range from 56 to 91 cm. Transitional individuals vary between 45 and 60 cm in length. The swamp eel population studied is composed of 80% primary males and 20% secondary males. Although gonadosomatic indices are always higher in primary males, they increase in secondary ones as the newly acquired stage progresses. The lamellar organization of the gonad of secondary males, the absence of this kind of testis in individuals smaller than 56 cm, and the presence of hermaphroditic fish, is evidence for protogyny in this species. |
| title |
Presence of primary and secondary males in a population of the protogynous Synbranchus marmoratus |
| title_short |
Presence of primary and secondary males in a population of the protogynous Synbranchus marmoratus |
| title_full |
Presence of primary and secondary males in a population of the protogynous Synbranchus marmoratus |
| title_fullStr |
Presence of primary and secondary males in a population of the protogynous Synbranchus marmoratus |
| title_full_unstemmed |
Presence of primary and secondary males in a population of the protogynous Synbranchus marmoratus |
| title_sort |
presence of primary and secondary males in a population of the protogynous synbranchus marmoratus |
| publishDate |
1996 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00221112_v49_n5_p788_LoNostro http://hdl.handle.net/20.500.12110/paper_00221112_v49_n5_p788_LoNostro |
| _version_ |
1768545129101000704 |