Embryonic and larval development of Jundiá (Rhamdia quelen, Quoy & Gaimard, 1824, Pisces, Teleostei), a South American Catfish

Abstract

The jundiá (Rhamdia quelen, Quoy & Gaimard) is an endemic South American fish species. Because this species supports cold winters and grows faster during warm months, it has begun to be viewed as an ideal species for fish production in southern South America. In the present study, jundiá oocytes used were obtained by extrusion from females after hormone injection. Soon after hydration, the eggs were transferred to 50 L conic glass incubators, with constant and controlled water influx. Samples of fertilized eggs were transferred to Petri dishes and, examined under a stereoscopic microscope, were spherical, demersal, and non-adhesive with defined perivitelline space and resistant chorion. Cleavage stages occurred during the first 3.5 h. After hatching, larvae were transferred to 200 L glass fiber incubators. First signs of embryo movement were observed 21 h after fertilization; larval eclosion occurred 30.5 h after fertilization. Present findings may provide a basis for studies aimed at determining the complete ontogeny of jundiá and may be useful in eco-toxicological studies.

Inseminating dose and water volume applied to the artificial fertilization of Steindachneridion parahybae (Steindachner, 1877) (Siluriformes: Pimelodidae): Brazilian endangered fish

“…That fact may be observed when compared with other species, such as Rhamdia quelen, which exhibits oocytes with average diameter from 1.0mm (Pereira et al, 2006) (Bombardelli et al, 2006). Sanches et al (2010), studying the same species, observed the VAP of 58.67±9.01µm s -1 and progression of 1,202.80±163.89µm 15 seconds after activation, unlike S. parahybae, which despite exhibiting larger eggs, also exhibits higher values of VAP and PROG, and even so needs higher inseminating doses.…”

Characterization of the early development of Pseudoplatystoma reticulatum Eigenmann & Eigenmann, 1889 (Siluriformes: Pimelodidae) from the Paraguay River Basin

“…The embryonic period of species using different reproductive strategies can be much longer. For example, the embryonic period of Rhamdia quelen (Quoy & Gaimard, 1824) lasted 30 h 5 min at 24 °C (Pereira et al, 2006), and that of Parauchenipterus galeatus (Linnaeus, 1766), lasted 64 h at a water temperature of 27-28 °C (Sanches et al, 1999).…”

Reprodução e alimentação de Rhamdia quelen (Quoy & Gaimard, 1824) em rios do Núcleo Santa Virgínia, Parque Estadual da Serra do Mar, São Paulo, SP

“…Existe um sincronismo entre machos e fêmeas durante a reprodução, que ocorre logo ao amanhecer, o macho segue a fêmea e promove alguns toques com a cabeça no seu ventre estimulando a desova (Baldisserotto & Radünz Neto 2004). Não apresenta cuidado parental e desova em locais com água limpa, calma e de fundo pedregoso (Godinho et al 1978, Gomes et al 2000, Pereira et al 2006. Os valores encontrados para a FRP (fecundidade relativa ao peso) de R. quelen nos rios Paraibuna e Grande foram próximos do apresentado para Rhamdia branneri (= R. quelen) em ambientes naturais preservados do Paraná (Paula-Souza 1978 apud Gomes et al 2000), mas foi superior ao de R. quelen em confinamento e inseminados artificialmente (Bombardelli et al 2006).…”