Desempeño de larvas y juveniles de Piaractus orinoquensis cultivados a diferentes densidades en sistemas con tecnología biofloc TBF.

The fish culture system with BFT presents favorable conditions of water quality and supply of live food for the culture of fish with indirect development in early stages, in this sense, the present study aimed to evaluate the larvae and juveniles culture of Piaractus orinoquensis with BFT at different stocking densities. For this purpose, biofloc was established at a carbon/nitrogen ratio of 15/1, evaluating six stocking densities, as follows: T1 = 10, T2 = 20, T3 = 30 larvae L-1 (initial weight = 0,74 ± 0,05 mg and an initial length = 5,07 ± 0,7 mm) and T4 = 40, T5 = 50 and T6 = 60 larvae L-1 (initial weight = 0,73 ± 0,07 mg and an initial length = 5,35 ± 0,3 mm). The studies were conducted in two phases: the first one of larviculture, during 12 days of culture, the results show that the survival (%) and the final weight were higher in the treatments of lower densities, however, the treatments with higher densities presented greater number of live larvae. For the second phase, from day 13 to 24 post-stocking (DPS), similar responses to larviculture were presented, being that survival (%) was higher at lower stocking densities (T1 = 79,8 ± 6,90 %), however, the total number of live juveniles was higher at higher densities (T6 = 34,5 ± 5,2 juveniles L-1); the final weight decreased as the density increased without the length presenting statistical differences. The multivariate analysis that related survival, weight, length, number of live larvae and juveniles, indicated that the best responses were presented in T3 with a survival of 49,5 ± 7,4 % and a final number of juveniles of 14,9 ± 2,1 L-1. The possibility of cultivating larvae and juveniles of P. orinoquensis in a superintensive way with biofloc technology is feasible under the reported conditions, obtaining the best results at a density of 30 larvae L-1. [ABSTRACT FROM AUTHOR]