Cultivation of white shrimp Litopenaeus vannamei, in a biofloc system in nurseries with different stocking densities and use of subsoil water
The intensive systems associated with the bioflocate system (BFT), do not require water exchange, allow maintenance of the quality of the water in the crop and provide the use of high stocking densities. This practice involving the formation of microbial flake and the use of high stocking densities is still little explored commercially in Brazil, as well as the use of subsoil water, which is an alternative for growing crops in inland regions. Existing studies indicate that L. vannamei in a heterotrophic environment has high survival and productivity at least five times higher than in traditional systems. The objective of this work was to determine the stocking densities (100 and 150 shrimp m-2) appropriate for the southern region of Brazil in the fattening of shrimp Litopenaeus vannamei in the biofloc system (BFT),evaluate zootechnical performance parameters and water quality parameters. In the present study, the ionic composition of the subsoil water and the water quality parameters of the crop were within acceptable limits for the growth and survival of the shrimp. The microbial community present was important as a supplement in the diet of cultivated animals, improving the feed conversion rate. The high stocking densities tested showed a statistical difference in productivity: 9,900 and 13,700 kg ha-1 for treatment 100 and 150 shrimp m-2, respectively. When using the BFT system, these stocking densities are viable both in the zootechnical performance of the shrimp and in the water quality parameters.However, the higher density (150 shrimp m-2) was more profitable due to its higher productivity.