Consulta: creatorFacets:"Batlouni,Sergio Ricardo"
Registros recuperados: 2
Data/hora: 06/06/2024 04:32:38

Gonadal steroids levels and vitellogenesis in the formation of oocytes in Prochilodus lineatus (Valenciennes) (Teleostei: Characiformes)
Provedor de dados: 83
Autores: Hainfellner,Patrick; Souza,Thiago Gonçalves de; Moreira,Renata Guimarães; Nakaghi,Laura Satiko Okada; Batlouni,Sergio Ricardo.
The objective of this study was to obtain information about the possible mechanisms related to poor reproductive performance in tropical rheophilic fish. To that effect, cages (Cs) and earthen ponds (EPs) were used as experimental systems to provide unsuitable and suitable conditions, respectively, for curimbatá (Prochilodus lineatus) breeders. Fish were maintained under experimental conditions for 18 months, and during this period females were randomly sampled every two months for biometric analysis (n=30), blood (n=5/sampling) and ovary (n=5/sampling). After this period EPs females (EPFs) and Cs females (CFs) were submitted to the induced breeding experiments. The results showed that rearing curimbatá for such long time in a cage at this stocking...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Reproductive cycle; Spawning performance; Steroid levels; Tropical rheophilic fish.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252012000300014

Dynamics of ovarian maturation during the reproductive cycle of Metynnis maculatus, a reservoir invasive fish species (Teleostei: Characiformes)
Provedor de dados: 83
Autores: Pereira,Thiago Scremin Boscolo; Moreira,Renata Guimarães; Batlouni,Sergio Ricardo.
In this study, we evaluated the dynamics of ovarian maturation and the spawning processes during the reproductive cycle of Metynnis maculatus. Adult females (n = 36) were collected bimonthly between April 2010 and March 2011. The mean gonadosomatic index (GSI) was determined, ovarian and blood samples were submitted for morphometric evaluation and the steroid plasma concentration was determined by ELISA. This species demonstrated asynchronous ovarian development with multiple spawns. This study revealed that, although defined as a multiple spawning species, the ovaries of M. maculatus have a pattern of development with a predominance of vitellogenesis between April and August and have an intensification in spawning in September; in October, a drop in the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Multiple spawns; Oocyte development; Spawning season; Steroid levels.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252013000400821