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Effect of dosage of orally administered 17α-methyltestosterone on sex reversion of the yellowtail tetra Astyanax lacustris (Lütken, 1875)
Farias, Renata da Silva; Oliveira, Karolayne Ribeiro da Silva; Souza, Marília Espíndola de; Ferreira, Dijaci Araújo; Silva, Alluanan Adelson do Nascimento; Silva Júnior, Valdemiro Amaro da; Dunham, Rex; Coimbra, Maria Raquel Moura.
Afiliação
  • Farias, Renata da Silva; Universidade Federal Rural de Pernambuco. Departamento de Pesca e Aquicultura. Recife. BR
  • Oliveira, Karolayne Ribeiro da Silva; Universidade Federal Rural de Pernambuco. Departamento de Pesca e Aquicultura. Recife. BR
  • Souza, Marília Espíndola de; Universidade Federal Rural de Pernambuco. Departamento de Pesca e Aquicultura. Recife. BR
  • Ferreira, Dijaci Araújo; Universidade Federal Rural de Pernambuco. Colégio Agrícola Dom Agostinho Ikas. São Lourenço da Mata. BR
  • Silva, Alluanan Adelson do Nascimento; Universidade Federal Rural de Pernambuco. Departamento de Medicina Veterinária. Recife. BR
  • Silva Júnior, Valdemiro Amaro da; Universidade Federal Rural de Pernambuco. Departamento de Medicina Veterinária. Recife. BR
  • Dunham, Rex; Auburn University. School of Fisheries, Aquaculture and Aquatic Sciences. Auburn. US
  • Coimbra, Maria Raquel Moura; Universidade Federal Rural de Pernambuco. Departamento de Pesca e Aquicultura. Recife. BR
Anim. Reprod. (Online) ; 20(1): e20220080, 2023. tab, ilus
Article em En | VETINDEX | ID: biblio-1418563
Biblioteca responsável: BR68.1
ABSTRACT
The females of yellowtail tetra (Astyanax lacustris), known as the freshwater sardine, are approximately 1.33 times larger than males, and thus, all-female monosex culture would increase production and reduce size variability. The present work aimed to identify the optimal dose of 17α-methyltestosterone (MT) to be used in the masculinization of A. lacustris for indirect sex reversal. Three different concentrations of MT (20, 40, and 60 mg/kg of feed in the diet) were fed to the fry for 30 days. Thirty adult individuals from each treatment, including the control (0 mg MT/kg), were evaluated for gonadal development, morphological and histological sexual identification, zootechnical performance, and the possible genotoxic effect caused by prolonged exposure to MT. MT significantly (P<0.01) affected the differentiation of the gonads, with the presence of possible inhibitory effects in all treatments. Intersex individuals were present in the 20 and 60 mg MT/kg treatments. All treatments were able to masculinize A. lacustris and the treatment with the lowest hormone concentration produced the highest percentage of males 76.7%, while the control had 46.7% males. The presence of erythrocyte nuclear alterations indicated a possible cytotoxic effect of MT in treatments 40 and 60 mg MT/kg, however, the use of the hormone did not affect the growth and the survival of the individuals. Thus, the use of MT is a viable option for obtaining neomales as a first step into the production of all-female progenies.(AU)
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Texto completo: 1 Base de dados: VETINDEX Idioma: En Revista: Anim. Reprod. (Online) Ano de publicação: 2023 Tipo de documento: Article

Texto completo: 1 Base de dados: VETINDEX Idioma: En Revista: Anim. Reprod. (Online) Ano de publicação: 2023 Tipo de documento: Article