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Abstract:

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.

Registro:

Documento: Artículo
Título:Presence of primary and secondary males in a population of the protogynous Synbranchus marmoratus
Autor:Lo Nostro, F.L.; Guerrero, G.A.
Filiación:Laboratorio de Enbriologia Animal, Departamento de Biologia, Universidad de Buenos Aires, 1428, Buenos Aires, Argentina
Palabras clave:diandric; gonads; hermaphroditism; protogynous; sex reversal; Synbranchidae; Synbranchus marmoratus; Synbranchus marmoratus; hermaphroditism; primary male; protogyny; secondary male; sex reversal; swamp-eel
Año:1996
Volumen:49
Número:5
Página de inicio:788
Página de fin:800
DOI: http://dx.doi.org/10.1006/jfbi.1996.0211
Título revista:Journal of Fish Biology
Título revista abreviado:J. FISH BIOL.
ISSN:00221112
CODEN:JFIBA
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00221112_v49_n5_p788_LoNostro

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Citas:

---------- APA ----------
Lo Nostro, F.L. & Guerrero, G.A. (1996) . Presence of primary and secondary males in a population of the protogynous Synbranchus marmoratus. Journal of Fish Biology, 49(5), 788-800.
http://dx.doi.org/10.1006/jfbi.1996.0211
---------- CHICAGO ----------
Lo Nostro, F.L., Guerrero, G.A. "Presence of primary and secondary males in a population of the protogynous Synbranchus marmoratus" . Journal of Fish Biology 49, no. 5 (1996) : 788-800.
http://dx.doi.org/10.1006/jfbi.1996.0211
---------- MLA ----------
Lo Nostro, F.L., Guerrero, G.A. "Presence of primary and secondary males in a population of the protogynous Synbranchus marmoratus" . Journal of Fish Biology, vol. 49, no. 5, 1996, pp. 788-800.
http://dx.doi.org/10.1006/jfbi.1996.0211
---------- VANCOUVER ----------
Lo Nostro, F.L., Guerrero, G.A. Presence of primary and secondary males in a population of the protogynous Synbranchus marmoratus. J. FISH BIOL. 1996;49(5):788-800.
http://dx.doi.org/10.1006/jfbi.1996.0211