GnRHa implants and temperature modulate Lambari-do-rabo-amarelo, Astyanax altiparanae (Characiformes: Characidae) induced reproduction out of the reproductive season

dc.contributor.authorBrambila-Souza, Gabriela [UNESP]
dc.contributor.authorMylonas, Constantinos Chrysanthos
dc.contributor.authorde Mello, Paulo Henrique [UNESP]
dc.contributor.authorKuradomi, Rafael Yutaka
dc.contributor.authorBatlouni, Sergio Ricardo [UNESP]
dc.contributor.authorTolussi, Carlos Eduardo
dc.contributor.authorMoreira, Renata Guimarães
dc.contributor.institutionUniversidade Estadual Paulista (UNESP)
dc.contributor.institutionHellenic Center for Marine Research
dc.contributor.institutionUniversidade Federal do Amazonas
dc.contributor.institutionUniversidade Anhembi Morumbi
dc.contributor.institutionUniversidade de São Paulo (USP)
dc.description.abstractWe evaluated the effect of gonadotropin in controlled-release implant together with temperature manipulation in the reproduction of Astyanax altiparanae (lambari) during the non-breeding season. Three groups of adult females were maintained at 20°C and three at 28°C. For each temperature, one group was treated with 4 μg GnRHa g−1, other with 8 μg GnRHa g−1 and other was sham implanted as a control during 4 weeks. Afterwards, 4 females/experimental group were induced to spawn with human chorionic gonadotropin, while 4 females/group were injected with saline. GnRHa implants increased fshβ and lhβ gene expression in females maintained at 28°C. The vtgA gene expression increased in the high GnRHa dose at 20°C, while this higher GnRHa dose associated with the higher temperature increased Gonadosomatic Index. The hCG injection increased the plasma Mature Induction Steroid levels and trigger ovulation, except in control at 28°C. The control females at 20°C spawned but with low reproductive performance, confirming that this is not a limiting temperature for reproduction. The administration of GnRHa as implant increased gonadotropin gene expression at 28°C, temperature at which GSI also increased. Qualitatively, the implants improved reproduction at 20°C, providing offspring out of the reproductive season, improving lambari production throughout the year.en
dc.description.affiliationUNESP- Universidade Estadual Paulista - Centro de Aquicultura (CAUNESP)
dc.description.affiliationInstitute of Marine Biology Biotechnology and Aquaculture Hellenic Center for Marine Research
dc.description.affiliationUniversidade Federal do Amazonas
dc.description.affiliationUniversidade Anhembi Morumbi
dc.description.affiliationInstituto de Biociências –Universidade de São Paulo (USP)
dc.description.affiliationUnespUNESP- Universidade Estadual Paulista - Centro de Aquicultura (CAUNESP)
dc.identifier.citationAquaculture Research.
dc.relation.ispartofAquaculture Research
dc.subjectneotropical fish
dc.titleGnRHa implants and temperature modulate Lambari-do-rabo-amarelo, Astyanax altiparanae (Characiformes: Characidae) induced reproduction out of the reproductive seasonen