Abstract
Superintensive growth of fish in a controlled environment involves taking a series of measures to ensure the oxygen necessary to
provide optimal living conditions for stocks. Considering the fact that oxygen has a relatively low solubility in water, the
photosynthesis in basins does not occur and the rate of incoming water may be low, it is imperative to supplement the water with
oxygen. The paper presents theoretical researches on mathematical modelling and numerical simulation of the dispersion of
dissolved oxygen injected through porous diffusers in a cylindrical tank, used in fish superintensive growth. The paper aims to
identify the optimal placement and sizing aeration system by choosing an adequate number of porous diffusers. In order to carry
out the numerical simulation the FlexPDE6 software was used. The simulations have been done in order to judiciously design a
recirculating system where oxygen may become one limiting factor in the sense that if falls below optimal value, the fish
population is predisposed to asphyxia and death can rapidly occur.