Avaliação da substituição do milho por farelo de arroz na dieta de juvenis de jundiá (Rhamdia quelen)

Abstract

The objective of this study was to evaluate the effect of replacement of corn by rice bran in the diet of juvenile catfish (Rhamdia quelen) on animal performance. The experiment was conducted for 28 days using a recirculating water system equipped with a thermoregulated biofilter. A total of 75 juvenile catfish at a density of 5 juveniles per experimental unit, randomly distributed into 15 experimental units, divided into five treatments: 0% control, treatments 25%, treatments 50%), treatments 75%) and treatments 100% and three repetitions. The feeding was administered two times a day (9:16 hours). The fish went through an adjustment period of one week and after a fast of 24 hours were selected for the initial biometrics. The following biometrics were done every 7 days parameters were final weight, total length, standard length, average daily gain, body condition factor, biomass and survival. The design was completely randomized. The data were subjected to analysis of variance and means were compared by Tukey test, both in the 5% level of significance. Juvenile silver catfish (Rhamdia quelen) fed the different treatments showed no difference in animal performance. The results obtained in the experiment were not significantly different (P>0,05) final body weights, average daily gain, total length, standard length, biomass, FCC and survival. It is concluded that the replacement of corn by rice bran showed no difference in performance of juvenile catfish. However, the inclusion of 100% rice bran, gave the performance more similar to the control treatment, showing that the most viable replacement of corn by rice bran in the diet of juvenile Silver Catfish.