Revista Brasileira de Zootecnia
versão On-line ISSN 1806-9290
ZUANON, Jener Alexandre Sampaio et al. Dietary protein and energy requirements of juvenile freshwater angelfish. R. Bras. Zootec. [online]. 2009, vol.38, n.6, pp.989-993. ISSN 1806-9290. http://dx.doi.org/10.1590/S1516-35982009000600003.
Dietary protein and energy requirements of juvenile freshwater angelfish (Pterophyllum scalare) were evaluated. A 3 × 2 factorial design was used, with three dietary crude protein levels being tested (26, 30, and 34% of CP) combined with two digestible energy levels (3,100 and 3,300 kcal DE/kg of diet) in three replicates. Juveniles averaging 2.33 ± 0.26 g were reared in a 25L-aquarium with controlled temperature (26 ± 1ºC), biological filter and stocking density of six fish/aquarium. Fish were fed ad libitum at 09:00 a.m., 2:00 p.m. and 4:30 p.m. The following performance parameters were evaluated: final weight, final length, weight gain, feed intake, feed conversion ratio, specific growth rate, protein efficiency ratio and condition factor. Fish fed diets with 26% CP showed greater protein efficiency values when compared to those fed diets with 34% CP. Diets with 26% of CP and 3100 kcal DE/kg could meet the nutritional requirements of juvenile freshwater angelfish.
Palavras-chave : growth; ornamental fish; productive performance; protein [energy ratio]; Pterophyllum scalare.