Artículo
Dynamics of ovarian maturation throughout the reproductive cycle of the neotropical cichlid fish Cichlasoma dimerus (Teleostei, Cichliformes)
Varela, María Luisa
; Ferreira, Maria Florencia
; Da Cuña, Rodrigo Hernán
; Lo Nostro, Fabiana Laura
; Genovese, Griselda
; Meijide, Fernando Javier
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Fecha de publicación:
04/2017
Editorial:
National Research Council Canada-NRC Research Press
Revista:
Canadian Journal of Zoology
ISSN:
0008-4301
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
In this study, we analyzed gene expression profiles, plasma steroids concentrations, and gonadal morphology throughout the reproductive cycle of female Cichlasoma dimerus (Heckel, 1840), a monogamous cichlid fish exhibiting social hierarchies. Fish were analyzed at six phases encompassing their annual cycle, namely resting (during the nonreproductive period), prespawning, 30 h post spawning, 4 days post spawning, 10 days post spawning, and subordinate (during the reproductive period). The histological and histomorphometric analysis showed that C. dimerus exhibits asynchronous ovarian development. Similar to resting females, subordinate females showed low gonadosomatic index, reduced expression levels of vitellogenin (vtgAb), zona pellucida (zpB), gonadal aromatase (cyp19a1A), and low concentrations of plasma sex steroids, thus indicating that social intimidation by dominant conspecifics elicited reproductive arrest. In reproductively active females, a direct positive correlation between plasma estradiol, vtgAb expression, percentage of late vitellogenic oocytes, and gonadosomatic index was observed. These parameters were maximal at the prespawning phase, decreased at 30 h post spawning and 4 days post spawning, and then reached a peak at 10 days post spawning. Our results indicate that female C. dimerus become spawning capable after 10 days post spawning, coincidently with the shortest time interval between successive spawns recorded in captivity.
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Articulos(IBBEA)
Articulos de INSTITUTO DE BIODIVERSIDAD Y BIOLOGIA EXPERIMENTAL Y APLICADA
Articulos de INSTITUTO DE BIODIVERSIDAD Y BIOLOGIA EXPERIMENTAL Y APLICADA
Citación
Varela, María Luisa; Ferreira, Maria Florencia; Da Cuña, Rodrigo Hernán; Lo Nostro, Fabiana Laura; Genovese, Griselda; et al.; Dynamics of ovarian maturation throughout the reproductive cycle of the neotropical cichlid fish Cichlasoma dimerus (Teleostei, Cichliformes); National Research Council Canada-NRC Research Press; Canadian Journal of Zoology; 95; 7; 4-2017; 485-498
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