Abstract

SILVA, M.O. et al. Growth and survival of piracanjuba (brycon orbignyanus) post larvae. Arch. zootec. [online]. 2009, vol.58, n.222, pp.285-288. ISSN 1885-4494.

This work was conducted in the fish laboratory of the Environmental Station of Itutinga, CEMIG in January 2002. The objective was to evaluate the behavior of piracanjunba (Brycon orbignyanus) post-larvae at different stocking densities and feeding frequencies. The post-larvae were manteined into eighteen plastic rectangular-shaped boxes of 30 liters of volume. All the boxes posessed individual supply and flow of water with a constant renewal, and water temperature controlled (27^oC), trough a heating system of the sort utilized in thermal pools. The experimental treatments consisted of three stocking densities (10, 20 and 30 post-larvae/liter) and two feeding frequencies (every 3 and 6 hours). The design was completely randomized with the treatments arranged into a 3 x 2 factorial scheme (stocking density x feeding frequency) with three replicates per treatment. The results showed that the increase of stocking density reduced linearly the fish's survival. There were significant differences (p<0.05) among the feeding frequencies as to survival, feeding the post-larvae in intervals of 3 hours being better. There were no significant difference among the stocking densities and the feeding frequencies as to average weight and growth of the post-larvae (p<0.05). According to the results obtained, it follows that the highest survival was obtained from the density of 10 larvae/liter, fed every 3 hours.

Keywords : Feeding frequency; Larviculture; Stocking density.

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