Data/hora: 06/06/2024 02:40:34

Provedor de dados: 	83	
País: 	Brazil	
Título: 	Dynamics of ovarian maturation during the reproductive cycle of Metynnis maculatus, a reservoir invasive fish species (Teleostei: Characiformes)	
Autores: 	Pereira,Thiago Scremin Boscolo; Moreira,Renata Guimarães; Batlouni,Sergio Ricardo.	
Data: 	2013-01-01	
Ano: 	2013	
Palavras-chave: 	Multiple spawns; Oocyte development; Spawning season; Steroid levels.	
Resumo: 	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 mean GSI values occurred, and the highest frequencies of post-ovulatory follicles (POFs) were observed. We observed a positive correlation between the POF and the levels of 17α-hydroxyprogesterone. Metynnis maculatus has the potential to be used as a source of pituitary tissue for the preparation of crude extracts for hormonal induction; the theoretical period for use is from September to December, but specific studies to determine the feasibility of this approach must be conducted.	
Tipo: 	Info:eu-repo/semantics/article	
Idioma: 	Inglês	
Identificador: 	http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252013000400821	
Editor: 	Sociedade Brasileira de Ictiologia	
Relação: 	10.1590/S1679-62252013000400010	
Formato: 	text/html	
Fonte: 	Neotropical Ichthyology  v.11 n.4 2013	
Fonte: 	info:eu-repo/semantics/openAccess