Influência da tecnologia de biofloco na qualidade de água e desenvolvimento da larva de tilápia do Nilo (Oreochromis niloticus)

Abstract

The present work evaluated the cultivation of nile tilapia larva (Oreochromis niloticus) in bioflake technology. The cultivation of Nile tilapia larvae in bioflake technology was carried out at the Aquatic Organisms Experimentation Laboratory (LEOA), of the Federal Rural University of Pernambuco (UFRPE), during the period of 28 days. A completely randomized design was adopted with three treatments: bioflake and feed (BFT), clear water with feed (ACD) and non-feed bioflake (BFTs), with four replications per treatment. We used 12 tanks with a useful volume of 15 L of water. Larvae with initial weight 0.001 g were fed ration formulated according to the requirement for the species and processed in the LIONA, with a trawling frequency of 6 times a day and feeding rate of 10 of biomass. Fertilization stemming from daily molasses was performed to maintain the 15:1 (C:N) ratio. L-1), conductivity (S. cm-1), salinity (g L-1), pH, total dissolved solids, total ammoniacal nitrogen (N-NAT), nitrite (N-NO2), nitrate (N-NO3), inorganic phosphate (P-PO4), turbidity, sedimentable solids (SS) and alkalinity. Zootechnical performance of larvae was evaluated using the variables final weight (mg), survival (), apparent feed conversion factor (FCA), TCA (/ day), and condition factor (K). In the observation of the difference between treatments according to the decriminalanalysis of correct allocation of the group that was 96.80 with P < 0.0001. The best results were achieved in bft and acd treatments, when compared to bioflake without feed. Bioflake technology is a good alternative for the cultivation of nile tilapia larva, allowing the reduction of feed use, since productive performance was similar to the treatment that used clear water and feed.