Reproduction of Pirapitinga do Sul (Brycon opalinus Cuvier, 1819) in the Parque Estadual da Serra do Mar-Núcleo Santa Virgínia, São Paulo, Brazil

Abstract

The objective of the study was to characterize seasonally and locally the reproduction of Pirapitinga do Sul (Brycon opalinus). The study area included three rivers (Paraibuna, Ipiranga, and Grande) in the Santa Virgínia Unit of the Serra do Mar State Park, State of São Paulo, Brazil. Breeding occurred in spring, summer, and autumn. The L 50 and the L 100 of this species were 16 to 18 cm and 26 to 28 cm, respectively. Spawning was total, with synchronous development in two groups. The size of mature oocytes was 1,346.4 µm, reaching a maximum of 2,570.4 µm, with a mean fecundity of 9,190.5 oocytes. This species has external fertilization, is non-migratory, and lacks parental care of the young. Preservation of the Pirapitinga do Sul depends, in great part, on maintaining water quality, preservation of the riverine forests, and access to breeding areas.Keywords: Brycon opalinus, reproduction, fecundity, Brazil. Reprodução da Pirapitinga do Sul (Brycon opalinus

Biologia reprodutiva de Astyanax henseli (Teleostei, Characidae) do curso superior do Rio dos Sinos, RS, Brasil

“…Uma fecundidade elevada usualmente é exibida por peixes de grande porte que realizam migrações e desovam todos os ovócitos em um único evento reprodutivo (AGOSTINHO et al, 2003;GOMIERO & BRAGA, 2007). Em contraste, uma fecundidade muito reduzida é comumente encontrada em espécies de pequeno porte que apresentam características que podem aumentar as chances de sobrevivência dos ovos e larvas, tais como inseminação, fecundação interna e cuidado parental (GELAIN et al, 1999;Azevedo et al, 2000;OLIVEIRA et al, 2002;SILVANO et al, 2003;LAMPERT et al, 2004LAMPERT et al, , 2007OLIVEIRA et al, 2010).…”

Genetic diversity and population structure of Brycon nattereri (Characiformes: Bryconidae): a Neotropical fish under threat of extinction

“…Despite the presence of some riparian vegetation along the sampled stretch, this has been fenced in for the cultivation of exotic trees. Furthermore, the recovery and expansion of riparian vegetation could also help expand the area of occurrence of B. nattereri, as has already been suggested for other species of the genus Brycon (Gomiero, Braga, 2007;Gomiero et al, 2008;Matsumoto, Hilsdorf, 2009;Vitorino Júnior et al, 2014); c) prohibition of hydroelectric dams. Although not present in the study area, a number of projects for the construction of small hydropower stations may pose a threat to the Laranjinha River (Agência Nacional de Energia Elétrica, 2015).…”

The fish fauna of the upper Piraí drainage, a transposed mountain river system in southeastern, Brazil

“…Two species collected in the upper Piraí drainage are included in the list of Brazilian fauna threatened by extinction (ICMBio 2016): Brycon opalinus, present in the lower reaches of Rio das Pedras stream, and Hemipsilichthys gobio, collected in the main channel of rio Piraí. Brycon opalinus, known as "pirapitinga", is Vulnerable due to commercial exploration and environment degradation, and its restricted distribution to preserved tributaries of the Paraíba do Sul and Doce headwaters (Gomiero andBraga 2007, ICMBio 2016). Hemipsilichthys gobio is Endangered due to habitat reduction and fragmentation (ICMBio 2016).…”