Use of different aeration systems in ponds in the fattening phase of white shrimp Litopenaeus vannamei, in intensive cultivation with bioflocs
Author: Julio Cesar Zemor (Currículo Lattes)
Supervisor: Dr Geraldo Kipper Fóes
Co-supervisor: Dr Luis Henrique da Silva Poersch
Asbtract
Aeration is an important management and control component in shrimp ponds that use the BFT system (Biofloc Technology System). It must supply the necessary demand for animal survival, in addition to bioflocs, phytoplankton and oxidation of organic matter, providing a certain degree of control over the accumulation of sediment in the nursery. The accumulation of anoxic sediment when it occurs, can generate stressful conditions, which limit the growth of the shrimp, directly affecting the zootechnical performance. This study aimed to assess the efficiency of aeration in maintaining water quality through different methods of incorporating dissolved oxygen and zootechnical performance in the fattening phase of shrimp Litopenaeus vannamei in an intensive system. The experiment was carried out in nine nurseries with an area of 600 m2,covered with high density polyethylene (HDPE) blankets. Different aeration systems were tested in three treatments (parallel, raceway and mixed) with three repetitions in each. 100 shrimp m-2 were stocked, with an average weight of 1.15 g and the experiment lasted 114 days. There were no significant differences (p> 0.05) in water quality parameters and zootechnical performance. However, the treatments evaluated did not show sediment accumulation at the bottom of the nurseries after harvesting and the productivity exceeded 12.4 ton ha-1 in all treatments