Factors affecting secondary sex characteristics in the yellowtail tetra, Astyanax altiparanae

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Autor(es): dc.contributorUniversidade Federal do Sul e Sudeste do Pará (UNIFESSPA)-
Autor(es): dc.contributorUniversidade Federal do Pará (UFPA)-
Autor(es): dc.contributorUniversidade Estadual Paulista (Unesp)-
Autor(es): dc.contributorCentro Nacional de Pesquisa e Conservação da Biota Aquática Continental (CEPTA-ICMBIO)-
Autor(es): dc.contributorUniversidade de São Paulo (USP)-
Autor(es): dc.creatorSiqueira-Silva, Diógenes H.-
Autor(es): dc.creatorBertolini, Rafaela M. [UNESP]-
Autor(es): dc.creatorLevy-Pereira, Nycolas-
Autor(es): dc.creatorNascimento, Nivaldo F.-
Autor(es): dc.creatorSenhorini, José A.-
Autor(es): dc.creatorPiva, Lucas Henrique-
Autor(es): dc.creatorFerraz, José Bento S.-
Autor(es): dc.creatorYasui, George S.-
Data de aceite: dc.date.accessioned2022-02-22T00:26:08Z-
Data de disponibilização: dc.date.available2022-02-22T00:26:08Z-
Data de envio: dc.date.issued2020-12-11-
Data de envio: dc.date.issued2020-12-11-
Data de envio: dc.date.issued2019-12-31-
Fonte completa do material: dc.identifierhttp://dx.doi.org/10.1007/s10695-020-00832-6-
Fonte completa do material: dc.identifierhttp://hdl.handle.net/11449/198998-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/11449/198998-
Descrição: dc.descriptionThis study interrogated factors which affect the appearance of secondary sexual characteristics, namely, fin spinelets (rigid dimorphic structure empirically associated with male sexual maturity in characids), in Astyanax altiparanae. Many variables such as the season of the year and several biotic components, including organism length, sex, phase of maturation, and the presence of gonads, were investigated. These factors were then associated with the physiological development of fin spinelets. The development of this trait is related to reproductive strategies but demonstrates considerable population variability as it is found throughout the year in some species but only during specific periods in others. Seventy-five specimens obtained from spontaneous spawn of farmed fish were arbitrarily grouped into small-, medium-, and large-sized groups in both summer and winter. Gonadal histology was performed to confirm each animal’s sex and phase of maturation. Diaphanization of the fish was performed to visualize, count, and measure the fin spinelets. Finally, gonadectomization of some males was utilized to investigate the gonadal effect on the presence of fin spinelets. The present results show that the presence of fin spinelets is a secondary sexual characteristic of males which occurs independently of the season and is always present in males longer than 48 mm. However, in the summer, male specimens presented more rays with fin spinelets than during the winter. Furthermore, since fin spinelets were observed on immature males as well as spawning capable males, their presence cannot be directly associated with sexual maturity in male A. altiparanae, as previously supposed. Finally, gonadectomization resulted in an initial reduction in the length of fin spinelets. However, this trend was eventually normalized with time.-
Descrição: dc.descriptionGrupo de Estudos da Reprodução de Peixes Amazônicos (GERPA/LaNec) Faculdade de Biologia Instituto de Estudo em Saúde e Biológicas (FACBIO/IESB) Universidade Federal do Sul e Sudeste do Pará (UNIFESSPA)-
Descrição: dc.descriptionPost-Graduation Program in Amazonian Animal Reproduction - ReproAmazon - UFPA/Ufra-
Descrição: dc.descriptionPrograma de Pós-Graduação em Ciências Biológicas (Zoologia) Univ Estadual Paulista (UNESP)-
Descrição: dc.descriptionCentro Nacional de Pesquisa e Conservação da Biota Aquática Continental (CEPTA-ICMBIO)-
Descrição: dc.descriptionDepartamento de Medicina Veterinária Faculdade de Zootecnia e Engenharia de Alimentos University of São Paulo (USP)-
Descrição: dc.descriptionPrograma de Pós-Graduação em Ciências Biológicas (Zoologia) Univ Estadual Paulista (UNESP)-
Idioma: dc.languageen-
Relação: dc.relationFish Physiology and Biochemistry-
???dc.source???: dc.sourceScopus-
Palavras-chave: dc.subjectDiaphanization-
Palavras-chave: dc.subjectFish reproduction-
Palavras-chave: dc.subjectGonadectomy-
Palavras-chave: dc.subjectSpinelets-
Título: dc.titleFactors affecting secondary sex characteristics in the yellowtail tetra, Astyanax altiparanae-
Tipo de arquivo: dc.typelivro digital-
Aparece nas coleções:Repositório Institucional - Unesp

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