Seafood is more and more produced in aquaculture because the yield from capture fisheries appears not to be increasable. This situation requires supplementing conventional aquaculture methods with efficient biotechnologies. The use of Recirculation Aquaculture Systems (RAS) and Multi-Trophic Recirculation Aquaculture Systems MTRAS technologies is necessary.

The interest is to use nutrients that are accumulated during the fish rearing process for the production of microalgae in photobioreactors. Microalgae deliver valuable raw materials for the feed industry that are high in demand.