Existência nutricional de vitamina C para juvenis de pacu (Piaractus mesopotamicus)

Abstract

The present work had the objective of evaluating the zootechnical performance of juveniles of Pacu (Piaractus mesopotamicus) fed diets containing different vitamin C inclusion levels. The experiment was carried out at the Fish and Aquaculture Laboratory of the Federal University of Pampa - UNIPAMPA, Campus Dom Pedrito, between November and December 2016, with a duration of 28 days, using a non-regulated water recirculation system. A total of 64 Pacu juveniles were used, with a mean weight of 61.34 ± 7.07g, in a completely randomized design, with 4 treatments and 2 replicates, using 8 animals in each experimental unit. The units had capacity of 500 liters of water, but were supplied with 380 liters each. The experimental units were also identified with labels corresponding to the proper treatment and repetition. The treatments were with different levels of inclusion of Vitamin C in the diet (Treatment 1: 0 mg Vit C / kg; Treatment 2: 100 mg Vit C / kg; Treatment 3: 200 mg Vit C / kg; Vit C / kg). The animals were fed daily at 09 and 16 hours, in the proportion of 5% of the total biomass. The results were submitted to analysis of variance (P <0.05) and the means were compared by the Tukey test and regression analysis. The results obtained in the experiment showed a significant difference (P <0.05) for final weight, final total length, final standard length, body condition factor and average daily gain, where treatment with inclusion of 100 mg Vit C / kg presented better Performance for almost all of these parameters, except for body condition factor, where the treatment with inclusion of 200 mg Vit C / kg obtained better performance. For the biomass gain and weight gain parameters, no significant difference was observed between the treatments, but for both parameters, the treatment with inclusion of 100 mg Vit C / kg also presented better performance. Thus, it can be concluded that the addition of 100 mg Vit C in the diet of pacu juveniles (Piaractus mesopotamicus) promoted better zootechnical performance of the animals.