Social and reproductive physiology and behavior of the Neotropical cichlid fish Cichlasoma dimerus under laboratory conditions

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In this work we describe for the first time the social and reproductive behavior of the Neotropical fish Cichlasoma dimerus (Heckel, 1840) [Perciformes: Cichlidae], endemic to the Paraná River basin, using a comprehensive-integral approach, including morphological and physiological features. This su...

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Autores principales: Alonso, F., Cánepa, M., Moreira, R.G., Pandolfi, M.
Formato: JOUR
Materias:
Cichlidae
Cortisol
Gonadosomatic index
Gonadotropins
Somatolactin
Cichlasoma
Perciformes
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_16796225_v9_n3_p559_Alonso
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling todo:paper_16796225_v9_n3_p559_Alonso2023-10-03T16:29:44Z Social and reproductive physiology and behavior of the Neotropical cichlid fish Cichlasoma dimerus under laboratory conditions Alonso, F. Cánepa, M. Moreira, R.G. Pandolfi, M. Cichlidae Cortisol Gonadosomatic index Gonadotropins Somatolactin Cichlasoma Cichlidae Perciformes In this work we describe for the first time the social and reproductive behavior of the Neotropical fish Cichlasoma dimerus (Heckel, 1840) [Perciformes: Cichlidae], endemic to the Paraná River basin, using a comprehensive-integral approach, including morphological and physiological features. This substrate breeding fish has biparental care of the fry and presents a dominance hierarchy that determines access to breeding territories among males, and to males with territories among females. Gregarious behavior associated with a pale body color, was observed before reproductive behaviors started. Afterwards, a dominance hierarchy was established through aggressive interactions. Territorial individuals had bright body color patterns and non territorial an opaque grey one. Black ventral coloration was associated with reproductive individuals. Courtship displays, which were similar to threatening displays, had the common effect of increasing the visible area of the individual. The dominant male was always the largest one suggesting that size is probably a major factor determining the hierarchy establishment and that these intra-sexually selected traits may have been reinforced by inter-sexual selection. Reproductive males had higher pituitary levels of β-follicle stimulating hormone (β-FSH) and somatolactin (SL) than non reproductive ones, while no differences were found among females. No differences were found among male gonadosomatic indexes. Non reproductive individuals had higher plasma cortisol levels for both sexes. It is possible that dominant reproductive individuals may be inhibiting reproduction of subordinate fish through physical contact, increasing their cortisol levels and diminishing FSH and SL pituitary content. However, this was not reflected as an inhibition at the gonadal level in our experimental design. © 2011 Sociedade Brasileira de Ictiologia. Fil:Alonso, F. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Cánepa, M. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Pandolfi, M. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_16796225_v9_n3_p559_Alonso
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Cichlidae
Cortisol
Gonadosomatic index
Gonadotropins
Somatolactin
Cichlasoma
Cichlidae
Perciformes
spellingShingle Cichlidae
Cortisol
Gonadosomatic index
Gonadotropins
Somatolactin
Cichlasoma
Cichlidae
Perciformes
Alonso, F.
Cánepa, M.
Moreira, R.G.
Pandolfi, M.
Social and reproductive physiology and behavior of the Neotropical cichlid fish Cichlasoma dimerus under laboratory conditions
topic_facet Cichlidae
Cortisol
Gonadosomatic index
Gonadotropins
Somatolactin
Cichlasoma
Cichlidae
Perciformes
description In this work we describe for the first time the social and reproductive behavior of the Neotropical fish Cichlasoma dimerus (Heckel, 1840) [Perciformes: Cichlidae], endemic to the Paraná River basin, using a comprehensive-integral approach, including morphological and physiological features. This substrate breeding fish has biparental care of the fry and presents a dominance hierarchy that determines access to breeding territories among males, and to males with territories among females. Gregarious behavior associated with a pale body color, was observed before reproductive behaviors started. Afterwards, a dominance hierarchy was established through aggressive interactions. Territorial individuals had bright body color patterns and non territorial an opaque grey one. Black ventral coloration was associated with reproductive individuals. Courtship displays, which were similar to threatening displays, had the common effect of increasing the visible area of the individual. The dominant male was always the largest one suggesting that size is probably a major factor determining the hierarchy establishment and that these intra-sexually selected traits may have been reinforced by inter-sexual selection. Reproductive males had higher pituitary levels of β-follicle stimulating hormone (β-FSH) and somatolactin (SL) than non reproductive ones, while no differences were found among females. No differences were found among male gonadosomatic indexes. Non reproductive individuals had higher plasma cortisol levels for both sexes. It is possible that dominant reproductive individuals may be inhibiting reproduction of subordinate fish through physical contact, increasing their cortisol levels and diminishing FSH and SL pituitary content. However, this was not reflected as an inhibition at the gonadal level in our experimental design. © 2011 Sociedade Brasileira de Ictiologia.
format JOUR
author Alonso, F.
Cánepa, M.
Moreira, R.G.
Pandolfi, M.
author_facet Alonso, F.
Cánepa, M.
Moreira, R.G.
Pandolfi, M.
author_sort Alonso, F.
title Social and reproductive physiology and behavior of the Neotropical cichlid fish Cichlasoma dimerus under laboratory conditions
title_short Social and reproductive physiology and behavior of the Neotropical cichlid fish Cichlasoma dimerus under laboratory conditions
title_full Social and reproductive physiology and behavior of the Neotropical cichlid fish Cichlasoma dimerus under laboratory conditions
title_fullStr Social and reproductive physiology and behavior of the Neotropical cichlid fish Cichlasoma dimerus under laboratory conditions
title_full_unstemmed Social and reproductive physiology and behavior of the Neotropical cichlid fish Cichlasoma dimerus under laboratory conditions
title_sort social and reproductive physiology and behavior of the neotropical cichlid fish cichlasoma dimerus under laboratory conditions
url http://hdl.handle.net/20.500.12110/paper_16796225_v9_n3_p559_Alonso
work_keys_str_mv AT alonsof socialandreproductivephysiologyandbehavioroftheneotropicalcichlidfishcichlasomadimerusunderlaboratoryconditions
AT canepam socialandreproductivephysiologyandbehavioroftheneotropicalcichlidfishcichlasomadimerusunderlaboratoryconditions
AT moreirarg socialandreproductivephysiologyandbehavioroftheneotropicalcichlidfishcichlasomadimerusunderlaboratoryconditions
AT pandolfim socialandreproductivephysiologyandbehavioroftheneotropicalcichlidfishcichlasomadimerusunderlaboratoryconditions
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