Use of air injectors in the cultivation of shrimp Litopenaeus vannamei in a biofloc system: formation of bioflocs, water quality and stocking density
One of the biggest advances for aquaculture was the development of bioflocate systems (BFT). BFT is able to control nitrogen compounds and improve water quality with minimal or no water renewal, generating natural and quality food (bioflocs) that is consumed by shrimp, and thus improving the zootechnical performance of the organisms created . BFT is characterized by the need for high concentrations of oxygen, and with the development of new technologies, such as air injection instruments, there is also a need for tests and research to assess whether these innovations adapt to the existing system, in order to increase the productive capacity. The present work aimed to contribute to improving the cultivation system of Litopenaeus vannamei in BFT. To that end, two experiments were carried out at the Marine Aquaculture Station (Institute of Oceanography of the Federal University of Rio Grande - FURG), and each experiment is described in the following chapters: (1) Use of different aeration systems for the fattening of Litopenaeus vannamei in super intensive cultivation in the midst of Bioflocs; (2) Fattening the Pacific white shrimp Litopenaeus vannamei at high stocking densities in BFT system. To carry out the experiments, a 585 m² rectangular greenhouse with nine tanks with a useful volume of 35 m³ was used. In the first experiment, more consistent results were observed in the use of the diffuse air system with microperforated hoses (Aerotube ™), standing out as an excellent aeration tool for the conditions found in the present study.In the second experiment, it can be inferred that even with a considerable increase in the stocking density, the aeration system used met the oxygen demand, however, a limit is established for this increase in stocking density.