Resumo

CHAVERRA GARCES, Sara Cristina; GARCIA GONZALEZ, José Jaime  e  PARDO CARRASCO, Sandra Clemencia. Biofloc effect on juvenils Cachama blanca Piaractus brachypomus growth parameters. Ces. Med. Vet. Zootec. [online]. 2017, vol.12, n.3, pp.170-180. ISSN 1900-9607.  https://doi.org/10.21615/cesmvz.12.3.1.

Biofloc cultures are an interesting alternative in which bacterial protein with high biological value is used as a possible food supplement and as part of a strategy to keep water quality within the parameters required by a given species. The production performance of juveniles of white cachama Piaractus brachypomus was compared for 60 days. The fish were reared in two systems: one was intensive and had water renewal (T1), while the other had biofloc technology (T2).T1 had 50% of its water changed weekly and the pond's bottom was cleaned twice per week. In contrast, T2 was a biofloc system (BFT) with added molasses in a carbon:nitrogen ratio of 15:1. In both treatments the fish were fed to apparent satiety four times per day. The feed was balanced and had 24% of protein of vegetable origin.A total of 480 fingerlings were used, whose average weight and size were 0.8 ± 0.33 and 3.0 ± 0.4 cm, respectively.The following parameters were determined on a fifteen-day basis: weight, standard length (SL), daily weight gain (DWG), specific rate of growth in terms of weight (SGR), biomass (B), feed conversion ratio (FCR), survival rate (S), condition factor (K). Likewise, dissolved oxygen (DO), temperature (T°), pH and salinity (ppT) were measured twice a day. Furthermore, total suspended solids (TSS) and biofloc volume were measured every two days.The total ammonia nitrogen (TAN) and the levels of nitrite, nitrate, alkalinity and hardness were determined weekly. Production performance showed no variations across treatments (P>0.05).The biofloc technology makes it possible to have the same fish densities as those observed in intensive production systems. Likewise, the production performance values are adequate and similar to those of this kind of system, but the water resource is optimized.

Palavras-chave : BFT; white cachama; vegetable protein; performance.

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