SciELO - Scientific Electronic Library Online

vol.44 issue2Dietary protein levels in Piaractus brachypomus submitted to extremely acidic or alkaline pHIn vitro rhizogenesis in Peltophorum dubium: the effect of different culture media author indexsubject indexarticles search
Home Pagealphabetic serial listing  

Services on Demand




Related links


Ciência Rural

Print version ISSN 0103-8478


SANTOS, Alejandra Filippo Gonzalez Neves dos; CARRERA, Pedro Ribeiro de Oliveira; ARONOVICH, Marcos  and  SANTOS, Luciano Neves dos. Feeding preference by juvenile pike characin, Oligosarcus hepsetus, on two prey fish species of fish in a controlled environment. Cienc. Rural [online]. 2014, vol.44, n.2, pp.307-313. ISSN 0103-8478.

This study was based on previously published data on natural diet of the pike characin, Oligosarcus hepsetus in a reservoir at Southeastern Brazil, and thus tested the feeding preference of this carnivore using microcosm experiments. The experiments were conducted in aquariums, in January 2011. Predators were collected in a tributary of the Paraíba do Sul River, while preys: Tilapia rendalli and Astyanax fasciatus were obtained of fish farms. We tested the feeding preference by pike characin in relation to prey size and species, and the results were compared to prey energy. Juvenile pike characin predated preferentially on tilapias with lower body length height, whereas no clear pattern of consumption was observed for lambaris. Tilapias were preferentially predated at experiments with standardized prey body length, whereas no feeding preference was recorded on any prey species at experiments with standardized prey body height. Energetic differences between prey species seem to be less important than morphological differences for the feeding preference of pike characin.

Keywords : Characiforms; Paraiba do Sul River basin; native fish.

        · abstract in Portuguese     · text in Portuguese     · Portuguese ( pdf )


Creative Commons License All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License