Relação energia: proteína para juvenis do Apaiari, Astronotus Ocellatus, (Cuvier, 1829) Swainson, 1839

Abstract

This study evaluated the influence of energy to protein ratio on performance of juvenile Apaiari (Astronotus ocellatus), adapted to feed intake and extruded pellets. To achieve this goal, 32 juveniles (4.99 ± 0.63 g) were stocked in 16 tanks of polyethylene, with a volume of 100 L, equipped with a system of mechanical and biological filtration, aeration and constant photoperiod of 12 h light: dark. The stocking rate used was 2 individuals / aquarium, which were segregated individually in cages structured screen with bamboo and polyethylene with 1 cm mesh size, avoiding competition and agonistic behavior of dominant individuals. The juveniles were fed four isocaloric diets (3850 kcal DE. Kg-1 diet), with protein levels ranging from 38%, 43%, 48% and 53%, resulting in a DE: CP ratio of 7, 8 , 9 and 10 kcal DE. g-1 CP. The pattern adopted, consisted of providing feed to apparent satiation twice a day at 10:16 hours for 75 days, in randomized experimental design. The average values obtained in performance were subjected to regression analysis and Tukey test to compare means. After the experiment, the average cumulative weight gain was better (p <0.05) for treatment 2, (10, 92 grams). The average among treatments for feed conversion ratio (1.8), as well as the specific growth rate (1.93%), protein efficiency rate (18.28%) and survival (100%) showed no significant difference between treatments (p> 0.05). The results suggest that the ratio of 8 kcal DE. g-1 CP meets the nutritional requirements of juvenile apaiari, A. ocellatus, showing the best levels of production performance.