Data/hora: 11/06/2024 21:49:01

Biblioteca(s): | Embrapa Pesca e Aquicultura.
Data corrente: | 01/10/2020
Data da última atualização: | 01/10/2020
Autoria: | TORATI, L. S.; TAYLOR, J. F.; MESQUITA, P. E. C.; MIGAUD, H.
Afiliação: | LUCAS SIMON TORATI, CNPASA; JOHN F. TAYLOR, UNIVERSITY OF STIRLING, Scotland-UK; PEDRO E. C. MESQUITA, DNOCS; HERVE MIGAUD, UNIVERSITY OF STIRLING, Scotland-UK.
Título: | GnRHa implants and size pairing effects on plasma and cephalic secretion sex steroids in Arapaima gigas.
Ano de publicação: | 2020
Fonte/Imprenta: | General and Comparative Endocrinology, v. 299, 113614, 2020.
ISSN: | 0016-6480
DOI: | https://doi.org/10.1016/j.ygcen.2020.113614
Idioma: | Inglês
Conteúdo: | Arapaima gigas, one of the world?s largest freshwater fish, is considered an emerging species for aquaculture development in Brazil given its high growth rate and meat quality. However, the lack of reproductive control in captivity has limited the expansion of Arapaima farming. This study aimed to test the effects of hormonal induction using mGnRHa implants and size pairing on broodstock reproduction through the analyses of sex steroids. To do so, broodstock of different sizes (large, small or mixed) were paired and implanted. Plasma and cephalic secretion profiles of testosterone (T), 11-ketotestosterone (11-KT) and 17&#946;-oestradiol (E2) were analysed. Compared to control (non-implanted), implanted broodstock showed a significant increase in plasma 11-KT (large and small males) and T (large and mixed females) post GnRHa implantation. In females, a significant increase in plasma T levels was shown, however, E2 remained unchanged after implantation. Despite the lack of clear spawning induction, this study showed the potency of GnRHa on sex steroid production regardless of pairing groups. Interestingly, significant correlations between blood plasma and cephalic secretion levels of 11-KT in males and T in females were observed, indicating the possible release of pheromones through the cephalic canals of A. gigas.
Palavras-Chave: | Sex steroids.
Thesagro: | Feromônio; Peixe; Pesquisa; Pirarucu; Reprodução.
Thesaurus Nal: | Arapaima gigas; Freshwater fish; Hormonal regulation; Pheromones; Reproduction.
Categoria do assunto: | L Ciência Animal e Produtos de Origem Animal
Registro original: | Embrapa Pesca e Aquicultura (CNPASA)
Exemplares: | CNPASA - (932-1) - UPC - AP - DD - 2020 -  - 2020 - DIS