The oceanloop is the result of a further development of recirculating aquaculture systems (RAS) to an almost completely closed water circulation. This enables the inland production of marine organisms for the first time. The technological and economical feasibility has been proven by the PISA research project.
Within the oceanloop there are a primary and several secondary water circulations. The main function of the primary water circulation is to transport the excrements of the fish, as fecal matter and dissolved nutrients, to the water treatment unit as fast as possible, in order to specifically remove them from the water. The function of the secondary circulations is to concentrate the removed excrements to such a degree, that as little water as possible is lost from the primary circulation. The water renewal rate is less than 1% of the system volume per day.
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Regarding the profitability of fish farming the operating costs are of particular importance, whereby the energy consumption represents a significant part. Therefore, the energy efficiency was in the main focus of technology development. The oceanloop works, in contrast to many other recirculating aquaculture systems, with almost the same water level and without piping in the components of primary water circulation. By this, pressure losses are minimized in such a way, that energy-efficient flow pumps can be used. Furthermore, a sophisticated component design leads to synergies between the different units of water treatment and improves the overall filter efficiency of the system.