Varela, M.L.; Ferreira, M.F.; Da Cuña, R.H.; Lo Nostro, F.L.; Genovese, G.; Meijide, F.J."Dynamics of ovarian maturation throughout the reproductive cycle of the neotropical cichlid fish Cichlasoma dimerus (Teleostei, Cichliformes)" (2017) Canadian Journal of Zoology. 95(7):485-498
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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. © 2017, Canadian Science Publishing. All rights reserved.


Documento: Artículo
Título:Dynamics of ovarian maturation throughout the reproductive cycle of the neotropical cichlid fish Cichlasoma dimerus (Teleostei, Cichliformes)
Autor:Varela, M.L.; Ferreira, M.F.; Da Cuña, R.H.; Lo Nostro, F.L.; Genovese, G.; Meijide, F.J.
Filiación:Laboratorio de Ecotoxicología Acuática, Departamento de Biodiversidad y Biología Experimental, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires & Instituto de Biodiversidad y Biología Experimental y Aplicada (IBBEA), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Universidad de Buenos Aires (UBA), Ciudad Autónoma de Buenos Aires, C1428EGA, Argentina
Palabras clave:Acará cichlid; Asynchronous ovarian development; Cichlasoma dimerus; Gene expression; Gonadal histology; Plasma steroids; Reproductive cycle; biochemical composition; blood; cichlid; correlation; gene expression; histology; maturation; monogamy; morphology; morphometry; Neotropical Region; physiology; reproductive cycle; spawning; steroid; Cichlasoma; Cichlidae; Teleostei
Página de inicio:485
Página de fin:498
Título revista:Canadian Journal of Zoology
Título revista abreviado:Can. J. Zool.


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---------- APA ----------
Varela, M.L., Ferreira, M.F., Da Cuña, R.H., Lo Nostro, F.L., Genovese, G. & Meijide, F.J. (2017) . Dynamics of ovarian maturation throughout the reproductive cycle of the neotropical cichlid fish Cichlasoma dimerus (Teleostei, Cichliformes). Canadian Journal of Zoology, 95(7), 485-498.
---------- CHICAGO ----------
Varela, M.L., Ferreira, M.F., Da Cuña, R.H., Lo Nostro, F.L., Genovese, G., Meijide, F.J. "Dynamics of ovarian maturation throughout the reproductive cycle of the neotropical cichlid fish Cichlasoma dimerus (Teleostei, Cichliformes)" . Canadian Journal of Zoology 95, no. 7 (2017) : 485-498.
---------- MLA ----------
Varela, M.L., Ferreira, M.F., Da Cuña, R.H., Lo Nostro, F.L., Genovese, G., Meijide, F.J. "Dynamics of ovarian maturation throughout the reproductive cycle of the neotropical cichlid fish Cichlasoma dimerus (Teleostei, Cichliformes)" . Canadian Journal of Zoology, vol. 95, no. 7, 2017, pp. 485-498.
---------- VANCOUVER ----------
Varela, M.L., Ferreira, M.F., Da Cuña, R.H., Lo Nostro, F.L., Genovese, G., Meijide, F.J. Dynamics of ovarian maturation throughout the reproductive cycle of the neotropical cichlid fish Cichlasoma dimerus (Teleostei, Cichliformes). Can. J. Zool. 2017;95(7):485-498.