Reproductive aspects of Cyphocharax voga (Hensel) from Custódias Lagoon, Rio Grande do Sul, Brazil (Characiformes, Curimatidae)

Abstract

ABSTRACT. The aim of this study was to analyse the reproductive period, fecundity and the size of the first gonadal maturation of Cyphocharax voga (Hensel, 1869) of Cust6dias Lagoon, state of Rio Grande do SuI, Brazil. The specimens (293 males and 247 females) were collected monthly, during the period between October 1994 and September 1995. The reproductive period took place from early winter until the end of spring. The average absolute fecundity was 36608 oocytes. The size of the first gonadal maturation was estimated in 121 and 128 mm for males and females respectively.

Reproductive strategies of two Curimatidae species in a Mogi Guaçu impoundment, upper Paraná River basin, São Paulo, Brazil

“…The high fecundity found in this study correspond to those reported in literature for other species of the family Curimatidae, which can vary from 4,380 to 100,130 oocytes (Nomura & Taveira, 1979;Romagosa et al, 1984;Hartz et al, 1994;Schifino et al, 1998;Sampaio & Sato, 2007), as well as the oocyte diameters, that ranges from 427 to 4,789 μm in high Paraná River basin fishes (Vazzoler, 1996). For many authors, fecundity and oocyte diameters do not necessarily depend on fish size, but on reproductive tactics (Vazzoler, 1996;Araujo, 2009;Casimiro et al, 2011).…”

Reproductive biology and feeding of Curimatella lepidura (Eigenmann & Eigenmann) (Pisces, Curimatidae) in Juramento reservoir, Minas Gerais, Brazil

“…This non-migratory species with no parental care reproduces at Três Marias reservoir, exhibiting an extended reproductive period (SATO et al2003). Other authors also reported that species of Curimatidae family are generally characterised by a long reproductive period (RODRIGUES et al 1989, HARTZ & BARBIERI 1994, SCHIFINO et al 1998. Probably due to the short rainy season, spawned females were captured at the Juramento reservoir during January/February/March only and, all females were found in resting in the following trimester.…”

Aspectos da história natural de Astyanax scabripinnis Jenyns (Teleostei, Characidae) em um riacho de floresta com araucária no sul do Brasil

“…As fêmeas foram registradas em número mais elevado, com exceção na classe de tamanho 4,7-5,3 cm, sendo que este fato já foi constatado por muitos autores (GOMES & MONTEIRO 1955, GURGEL 1995, SCHIFINO et al 1998, TAKEUTI et al 1999, inclusive para Astyanax (NOMURA 1975), o que pode estar relacionado a diversos fatores, como taxas de crescimento diferenciado, maior mortalidade dos machos, maior longevidade das fêmeas ou até mesmo à suscetibilidade aos aparelhos de pesca utilizados.…”