Resumo
Poecilia vivipara (Bloch & Schneider. 1801) is a species that lives in the Rodrigo de Freitas lagoon, a coastal lagoon in the city of Rio de Janeiro. The objective of this study was to increase the knowledge about reproductive aspects of P. vivipara population including: the female size when it begins reproduction, the number of offsprings per gestation, embrionary development stages and the number of pregnant females. The results show that P. vivipara reproduces throughout the whole year with its first maturation occurring at 29 mm. The proportion found of females to males was 3:1. Embryos showed four developmental stages until birth with sexual differentiation occurring after 15mm.
Poeciliidae; Poecilia vivipara; reproduction; viviparity
Poeciliidae; Poecilia vivipara; reproduction; viviparity
Aspectos reprodutivos de Poecilia vivipara (Bloch & Schneider) (Poeciliidae) da Lagoa Rodrigo de Freitas, Rio de Janeiro, Brasil
Reproductive aspects of Poecilia vivipara (Bloch & Schneider) Poeciliidae of Rodrigo de Freitas Lagoon, Rio de Janeiro, Brazil
José P. MendonçaI,II; José V. AndreataII
IBolsista do CNPq
IIInstituto de Ciências Biológicas e Ambientais, Universidade Santa Úrsula. Rua Fernando Ferrari 75, Botafogo, 22231-040 Rio de Janeiro, Rio de Janeiro, Brasil. E-mail: jvandreata@ax.apx.org
ABSTRACT
Poecilia vivipara (Bloch & Schneider. 1801) is a species that lives in the Rodrigo de Freitas lagoon, a coastal lagoon in the city of Rio de Janeiro. The objective of this study was to increase the knowledge about reproductive aspects of P. vivipara population including: the female size when it begins reproduction, the number of offsprings per gestation, embrionary development stages and the number of pregnant females. The results show that P. vivipara reproduces throughout the whole year with its first maturation occurring at 29 mm. The proportion found of females to males was 3:1. Embryos showed four developmental stages until birth with sexual differentiation occurring after 15mm.
Key words: Poeciliidae, Poecilia vivipara, reproduction, viviparity
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Recebido em 27.IV.2000; aceito em 15.X.2001.
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Datas de Publicação
-
Publicação nesta coleção
09 Jun 2009 -
Data do Fascículo
Dez 2001
Histórico
-
Recebido
27 Abr 2000 -
Aceito
15 Out 2001