Reprodução da piranha-amarela Serrasalmus spilopleura Kner, 1858, em lagos de várzea, Amazonas, Brasil

Abstract

Serrasalmus spilopleura (piranha) is a source of animal protein for marginal populations, it is occasionally sold in markets and fairs in the region. Considering the scarcity of information on reproduction of fish in floodplain lakes, the study proposes to investigate the average size at first maturity and spawning season of S. spilopleura lakes Jaitêua-São Lourenço, Manacapuru, AM. Also related are the abiotic factors (water level and depth) and biotic (condition factor) with the spawning season. 232 females were captured from August 2006 to June 2007, using gill net, and in the laboratory were used for biometrics and identification of the maturation stages. The spawning season of the females was established through the temporal distribution of relative frequency in different maturation stages and relative condition factor, Kn = Pt/aCp b , where: Kn = relative condition factor; Pt = total weight; Cp = standard length, a and b = constants obtained from regression between weight and length. And, to check for correlation between condition factor and with the spawning season depth of the lakes, we used the Spearman correlation coefficient of the 5% significance level. The amplitude of the standard length of specimens ranged 7-22 cm. Correlation analysis between Kn and spawning season (r s = 0.58, p < 0.05) was positive, i.e. the spawning season corresponded to the higher Kn, suggesting that an indicator of spawning season of S. spilopleura. There was a negative correlation between the depth and Kn (r s = -0.66, p < 0.05) and between depth and spawning season (r s = -0.25, p < 0.05). The estimated L 50 corresponded to 13.0 ± 0.09 cm and 17.0 ± 0.02 cm L 100 , S. spilopleura develops its complex reproductive cycle in the lake of Grand Lake Manacapuru, and based on indicators of reproduction, spawning season and relative condition factor, spawning begins in December, early on the rising extending to February, mid-rising, which coincided with the rise of water level of the Solimões-Amazon River and deep lakes. Resumo: Serrasalmus spilopleura (piranha-amarela) é fonte de proteína animal para as populações ribeirinhas, sendo ocasionalmente comercializada nos mercados e feiras da região. Considerando a escassez de informações sobre a reprodução de peixes em lagos de várzea, o trabalho propõe investigar o comprimento médio de primeira maturação sexual e a época de desova de S. spilopleura nos lagos Jaitêua-São Lourenço, Manacapuru, AM. Também são relacionados os fatores abióticos (nível de água e profundidade) e bióticos (fator de condição) com a época de desova. Foram capturadas 232 fêmeas no período de agosto de 2006 a junho 2007, utilizando rede-de-emalhar e, em laboratório, foram realizadas as biometrias e identificação dos estádios de maturação gonadal. A época de desova das fêmeas foi estabelecida através da distribuição temporal da freqüência relativa nos diferentes estádios de maturação gonadal e do fator de condição relativo, Kn = Pt/aCp b , onde: Kn = fator de condição relativo; Pt = peso total; Cp = co...

Hydrological seasons fast identification applied to Jaitêua and São Lourenço lakes, Manacapuru, Amazonas State

“…Despite its importance, Amazon floodplain seasons delimitation are mostly arbitrary (Merona & Gascuel, 1993;Cunico, Graça, Veríssimo & Bini, 2002;Maciel, 2010;Maciel, Soares & Prestes, 2011), leading to comparison difficulties among different years studies. In attempt to establish a standard method, Bittencourt & Amadio (2007) proposed a statistical procedure to identify the Negro river hydrological seasons based in its a water level historical dataset.…”

Influence of the flood pulse on the reproduction of Tocantinsia piresi (Miranda Ribeiro) and Auchenipterus nuchalis (Spix & Agassiz) (Auchenipteridae) of the middle Xingu River, Brazil

“…The variation in the hydrological cycle also plays a significant role in the maturation of the gonads, spawning season, and the larval development of fish species (Goulding, 1980;Ruffino and Isaac, 1995;Zeug and Winemiller, 2008;Queiroz et al, 2010;Freitas et al, 2011;Maciel et al, 2011;Prudente et al, 2015). Spawning during the filling and flood season may contribute to reproductive success in many fish species (Godinho et al, 2010), due in particular to the increased availability of habitats that favour the survival of larvae and fry (Agostinho et al, 2004).…”