Data/hora: 01/06/2024 11:27:19

Provedor de dados: | 104
País: | Brazil
Título: | Reproductive biology of Moenkhausia intermedia (Eigenmann) (Pisces, Characiformes) in Itumbiara Reservoir, Goiás, Brazil
Autores: | Hojo,Renê Eiji Souza; Santos,Gilmar Bastos; Bazzoli,Nilo.
Data: | 2004-09-01
Ano: | 2004
Palavras-chave: | Gonads; Reproduction; Sexual dimorphism; Sexual maturation; Spawning.
Resumo: | To study the reproductive biology of Moenkhausia intermedia (Eigenmann, 1908) in Itumbiara reservoir, Paranaíba river, Goiás, Brazil, a total of 301 specimens (237 females and 64 males) were captured quaterly from January to December 1993. The gonadosomatic index of females and males were related to morphologic variations of the gonads in different reproductive cycle stages (RCS). Analysis of RCS frequency and variations in the gonadosomatic index showed that M. intermedia reproduces during the whole year with fractional spawning. The smallest standard length at advanced maturity stage was estimated as 6.6 cm for females and 6.0 cm for males. The stomach repletion and coelomic fat indexes of both sexes reached peak values in the rest stage, suggesting that this species probably store energy in this phase and consume its fat reserve during reproduction. In the Itumbiara reservoir there was female predominance (4:1). Males were smaller than females, indicating sexual dimorphism in M. intermedia.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752004000300015
Editor: | Sociedade Brasileira de Zoologia
Relação: | 10.1590/S0101-81752004000300015
Formato: | text/html
Fonte: | Revista Brasileira de Zoologia  v.21 n.3 2004
Fonte: | info:eu-repo/semantics/openAccess