Distribuição das larvas de Mylossoma aureum e M. duriventre (Pisces: Serrasalmidae) nas margens do rio Solimões, AM

Abstract

The larvae distribution of Mylossoma aureum and M. duriventre were analyzed on the Solimões river comprising 60 km long, during two years (1995)(1996). Distributions between habitats and in the vertical strata were considered. The main habitats considered were cutting banks, filling banks, mouth lake channels and lake channels. The distribution was not homogeneous between habitats. The lowest densities were found in the filling banks and the highest in the cutting banks and mouth of lake channels. Lake channels present higher larval abundance than filling banks. This pattern seems to be related to hydrodynamics processes associated with the spawning and larval behavior of the two species. In the most habitats M. aureum was more abundant at the surface samples than the bottom samples, but M. duriventre showed the opposite vertical distribution. The vertical stratification seems to be due to swimming abilities of the larvae.

Distribution of economically important fish larvae (Characiformes, Prochilodontidae) in the Central Amazonia, Brazil

“…The high densities of larvae in areas at the mouths of lake channels and barrancos are consistent with the results of Oliveira and Araújo‐Lima () and Oliveira (). These authors also found a higher quantity of Characiformes larvae by the shores, and a lower density in the central channel of the Amazon River.…”

“…Such temporal patterns need to be understood to provide reliable evaluation of fish status and accurate basis for planning, and ensure healthy, well‐managed fisheries (Booth, ; Shuai et al., ). However, in the Amazon, studies of ecology and distribution the fish larvae remain scarce; exceptions are the studies of Oliveira and Araújo‐Lima (), Oliveira (), Araújo‐Lima, Silva, Petry, Oliveira and Moura (), Lima and Araújo‐Lima (), Oliveira and Ferreira (), Mounic‐Silva and Leite (), Ponte et al. (), Zacardi and Ponte () and Chaves et al.…”

Chromosome mapping of repetitive sequences in four Serrasalmidae species (Characiformes)

“…The family Serrasalmidae comprises approximately 80 species distributed among 15 genera, with a number of commercially important species of the genera Colossoma , Mylossoma , and Piaractus , which are valued for fishing or aquaculture in the Amazon region (Araújo-Lima and Goulding, 1998; Oliveira and Araújo-Lima, 1998; Jégu, 2003; Nelson, 2006). The species of this family are popularly known as “pacus”, “piranhas” and “tambaqui” ( C. macropomum ), which have high, laterally compressed bodies with abdominal spines and long dorsal fins.…”

A dieta das larvas de Mylossoma aureum e Μ. duriventre na Amazônia central

“…As duas espécies de Mylossoma consumiram principalmente ciclopóidos em quatro dos cinco lagos estudados. Suas larvas ocorrem na várzea durante o mesmo período do ano, mas seus picos de abundância não são sincronizados, apresentando uma diferença de 20 a 30 dias (Oliveira & Araujo-Lima, 1998 Peixes planctívoros, em geral, selecionam suas presas pela facilidade de detectá-las, pela capacidade de persegui-las e capturá-las ou ainda pela possibilidade de retê-las e digerilas (Lazzaro, 1987). A visibilidade da presa é acentuada pela luminosidade, pelo contraste da presa contra um plano de fundo, pelo seu tamanho, forma, pigmentação e movimentação.…”

“…Possuem alta fecundidade e se reproduzem quando as águas do rio começam a invadir as áreas marginais (Bayley & Petrere, 1989). As desovas ocorrem principalmente no canal do rio (Goulding, 1980;Araujo-Lima etal, 1993;Oliveira & Araujo-Lima, 1998). Embora existam poucas informações quantitativas a respeito da ecologia das larvas de M. aureum e de M. duriventre no rio Solimões/ Amazonas, sabe-se que após um período no canal do rio, elas concentram-se na sua planície de inundação (Araujo-Lima et ai, 1993).…”